resqpy.grid.Grid¶
- class resqpy.grid.Grid(parent_model, uuid=None, find_properties=True, geometry_required=True, title=None, originator=None, extra_metadata={})¶
Bases:
BaseResqpy
Class for RESQML Grid (extent and geometry) within RESQML model object.
Public Data Attributes:
resqml_type
Returns the number of layers including any K gaps.
Inherited from
BaseResqpy
resqml_type
Standard part name corresponding to self.uuid.
XML node corresponding to self.uuid.
Citation block title equivalent to self.title.
Commonly Used Methods:
__init__
(parent_model[, uuid, ...])Create a Grid object and optionally populate from xml tree.
Loads from hdf5 into memory all the arrays defining the grid geometry.
write_hdf5
([expand_const_arrays])Writes grid geometry arrays to hdf5 (thin wrapper around write_hdf5_from_caches().
xy_units
()Returns the projected view (x, y) units of measure of the coordinate reference system for the grid.
z_units
()Returns the vertical (z) units of measure of the coordinate reference system for the grid.
create_xml
([ext_uuid, add_as_part, ...])Creates an IJK grid node from a grid object and optionally adds to parts forest.
points_ref
([masked])Returns an in-memory numpy array containing the xyz data for points used in the grid geometry.
corner_points
([cell_kji0, points_root, ...])Returns a numpy array of corner points for a single cell or the whole grid.
centre_point
([cell_kji0, cache_centre_array])Returns centre point of a cell or array of centre points of all cells.
Creates an array attribute holding set of 4 pillar indices for each I, J column of cells.
pinched_out
([cell_kji0, tolerance, ...])Returns boolean or boolean array indicating whether cell is pinched out.
volume
([cell_kji0, points_root, ...])Returns bulk rock volume of cell or numpy array of bulk rock volumes for all cells.
thickness
([cell_kji0, points_root, ...])Returns vertical (z) thickness of cell and/or caches thicknesses for all cells.
Return True if z increases downwards in the coordinate reference system used by the grid geometry
xyz_box
([points_root, lazy, local])Returns the minimum and maximum xyz for the grid geometry.
Methods:
set_modified
([update_xml, update_hdf5])Assigns a new uuid to this grid; also calls set_modified() for parent model.
cell_count
([active_only, ...])Returns number of cells in grid; optionally limited by active, non-pinched-out, or having geometry.
natural_cell_index
(cell_kji0)Returns a single integer for the cell, being the index into a flattened array.
natural_cell_indices
(cell_kji0s)Returns a numpy integer array with a value for each of the cells, being the index into a flattened array.
Returns a 3 element cell_kji0 index (as a tuple) for the cell with given natural index.
Returns an integer array holding kji0 indices for the cells with given natural indices.
resolve_geometry_child
(tag[, child_node])If xml child node is None, looks for tag amongst children of geometry root.
set_parent
(parent_grid_uuid, ...)Set relationship with respect to a parent grid.
actual_pillar_shape
([patch_metadata, tolerance])Returns actual shape of pillars.
column_is_inactive
(col_ji0)Returns True if all the cells in the specified column are inactive.
write_hdf5_from_caches
([file, mode, ...])Create or append to an hdf5 file.
Returns False if IJK and xyz have same handedness, True if they differ.
write_nexus_corp
(file_name[, local_coords, ...])Write grid geometry to file in Nexus CORP ordering.
skin
([use_single_layer_tactics, is_regular])Returns a GridSkin composite surface object reoresenting the outer surface of the grid.
x_section_points
(axis[, ref_slice0, ...])Deprecated: please use unsplit_x_section_points instead.
cell_geometry_is_defined
([cell_kji0, ...])Returns True if the geometry of the specified cell is defined.
pillar_geometry_is_defined
([pillar_ji0, ...])Returns True if the geometry of the specified pillar is defined; False otherwise.
geometry_defined_for_all_cells
([cache_array])Returns True if geometry is defined for all cells; False otherwise.
Returns True if geometry is defined for all pillars; False otherwise.
Returns an in-memory numpy array containing the boolean data indicating which cells have geometry defined.
Returns an in-memory numpy array containing the boolean data indicating which pillars have geometry defined.
set_geometry_is_defined
([treat_as_nan, ...])Set cached flags and/or arrays indicating which primary pillars have any points defined and which cells all points.
find_faults
([set_face_sets, ...])Searches for column-faces that are faulted and assigns fault ids; creates list of column-faces per fault id.
Finds mean throw of each J and I face; adds throw arrays as attributes to this grid and returns them.
fault_throws_per_edge_per_column
([mode, ...])Return array holding max, mean or min throw based on split node separations.
Returns the uuid of the parent grid for the supplied grid
transmissibility
([tolerance, ...])Returns transmissibilities for standard (IJK neighbouring) connections within this grid.
Returns the grid extent; for IJK grids this is a 3 integer numpy array, order is Nk, Nj, Ni.
Returns boolean indicating whether grid IJK axes are right handed, as stored in xml.
Returns boolean indicating whether increasing K indices are generally for deeper cells, as stored in xml.
Returns integer time index, or None, for the grid geometry, as stored in xml for dynamic geometries.
Returns uuid for coordinate reference system, as stored in geometry xml tree.
set_crs
([crs_uuid])Establish crs attribute if not already set
Establishes the represented interpretation uuid, as stored in the xml tree, if present
Returns string indicating whether whether pillars are curved, straight, or vertical as stored in xml.
Returns boolean indicating whether grid geometry has any split coordinate lines (split pillars, ie.
Returns information about gaps (voids) between layers in the grid.
Loads stratigraphic information from xml.
Looks for LGRs related to this grid and sets the local_grid_uuid_list attribute.
Load grid property collection object holding lists of all properties in model that relate to this grid.
extract_inactive_mask
([check_pinchout])Returns boolean numpy array indicating which cells are inactive, if (in)active property found in this grid.
is_split_column_face
(j0, i0, axis, polarity)Returns True if the I or J column face is split; False otherwise.
Returns a pair of numpy boolean arrays indicating which internal column faces (column edges) are split.
Discard face sets.
Creates a grid connection set for each feature in the face set dictionary, based on kelp list pairs.
Creates a curtain face set for each named fault in dataframe.
make_face_sets_from_pillar_lists
(...[, ...])Creates a curtain face set for each pillar (or rod) list.
face_centre
(cell_kji0, axis, zero_or_one[, ...])Returns xyz location of the centre point of a face of the cell (or all cells).
face_centres_kji_01
(cell_kji0[, ...])Returns an array of shape (3, 2, 3) being (axis, 0 or 1, xyz) of face centre points for cell.
Modifies the cached points (geometry), setting the values from a points property.
point_raw
([index, points_root, cache_array])Returns element from points data, indexed as in the hdf5 file; can optionally be used to cache points data.
point
([cell_kji0, corner_index, ...])Return a cell corner point xyz; can optionally be used to cache points data.
Frees up memory by removing the cached copy of the grid's points data.
unsplit_points_ref
([cache_array, masked])Returns a copy of the points array that has split pillars merged back into an unsplit configuration.
horizon_points
([ref_k0, heal_faults, kp])Returns reference to a points layer array of shape ((nj + 1), (ni + 1), 3) based on primary pillars.
split_horizon_points
([ref_k0, masked, kp])Returns reference to a corner points for a horizon, of shape (nj, ni, 2, 2, 3).
split_x_section_points
(axis[, ref_slice0, ...])Returns an array of points representing cell corners from an I or J interface slice for a faulted grid.
split_gap_x_section_points
(axis[, ...])Return array of points representing cell corners from an I or J interface slice for a faulted grid.
unsplit_x_section_points
(axis[, ref_slice0, ...])Returns a 2D (+1 for xyz) array of points representing cell corners from an I or J interface slice.
x_section_corner_points
(axis[, ref_slice0, ...])Returns a fully expanded array of points representing cell corners from an I or J interface slice.
pixel_map_for_split_horizon_points
(...[, dy])Makes a mapping from pixels to cell j, i indices, based on split horizon points for a single horizon.
Returns xyz of top and bottom of each primary pillar.
z_corner_point_depths
([order])Returns the z (depth) values of each corner of each cell.
Deletes cached copy of corner points, if present.
centre_point_list
(cell_kji0s)Returns centre points for a list of cells; caches centre points for all cells.
point_areally
([tolerance])Returns array indicating which cells are reduced to a point in both I & J axes.
interpolated_point
(cell_kji0, ...[, ...])Returns xyz point interpolated from corners of cell.
interpolated_points
(cell_kji0, ...[, ...])Returns xyz points interpolated from corners of cell.
Sets the K direction indicator based on z direction and mean z values for top and base.
find_cell_for_point_xy
(x, y[, k0, ...])Searches in 2D for a cell containing point x,y in layer k0; return (j0, i0) or (None, None).
half_cell_transmissibility
([use_property, ...])Returns (and caches if realization is None) half cell transmissibilities for this grid.
pillar_foursome
(ji0[, none_if_unsplit])Returns an int array of the natural pillar indices applicable to each column around primary.
pillar_distances_sqr
(xy[, ref_k0, kp, ...])Returns array of the square of the distances of primary pillars in x,y plane to point xy.
nearest_pillar
(xy[, ref_k0, kp])Returns the (j0, i0) indices of the primary pillar with point closest in x,y plane to point xy.
nearest_rod
(xyz, projection, axis[, ...])Returns the (k0, j0) or (k0 ,i0) indices of the closest point(s) to xyz(s); projection is 'xy', 'xz' or 'yz'.
poly_line_for_cell
(cell_kji0[, vertical_ref])Returns a numpy array of shape (4, 3) being the 4 corners.
interface_lengths_kji
(cell_kji0[, ...])Returns 3 interface centre point separation lengths for axes k, j, i.
interface_vectors_kji
(cell_kji0[, ...])Returns 3 interface centre point difference vectors for axes k, j, i.
interface_length
(cell_kji0, axis[, ...])Returns the length between centres of an opposite pair of faces of the cell.
interface_vector
(cell_kji0, axis[, ...])Returns an xyz vector between centres of an opposite pair of faces of the cell (or vectors for all cells).
cell_inactive
(cell_kji0[, pv_array, pv_tol])Returns True if the cell is inactive.
get_volume_uom
(required_uom)Returns a RESQML unit of measure string to use for volume quantities for the grid.
get_volume_conversion_factor
(required_uom)Returns a factor for converting volumes calculated in the grid's CRS to the required uom.
fault_connection_set
([skip_inactive, ...])Returns (and caches) a GridConnectionSet representing juxtaposition across faces with split pillars.
pinchout_connection_set
([skip_inactive, ...])Returns (and caches) a GridConnectionSet representing juxtaposition across pinched out cells.
k_gap_connection_set
([skip_inactive, ...])Returns (and caches) a GridConnectionSet representing juxtaposition across zero thickness K gaps.
Check grid top face I & J edge vectors (in x,y) against basal equivalents.
global_to_local_crs
(a, crs_uuid[, ...])Converts array of points in situ from global coordinate system to established local one.
local_to_global_crs
(a, crs_uuid[, ...])Converts array of points in situ from local coordinate system to global one.
composite_bounding_box
(bounding_box_list)Returns the xyz box which envelopes all the boxes in the list, as a numpy array of shape (2, 3).
bounding_box
(cell_kji0[, points_root, ...])Returns the xyz box which envelopes the specified cell, as a numpy array of shape (2, 3).
xyz_box_centre
([points_root, lazy, local])Returns the (x,y,z) point (as 3 element numpy) at the centre of the xyz box for the grid.
pixel_maps
(origin, width, height, dx[, dy, ...])Makes a mapping from pixels to cell j, i indices, based on split horizon points for a single horizon.
split_horizons_points
([min_k0, max_k0, masked])Returns reference to a corner points layer of shape (nh, nj, ni, 2, 2, 3) where nh is number of horizons.
Add triplet of transmissibility multiplier properties by combining gcs properties.
Inherited from
BaseResqpy
__init__
(parent_model[, uuid, ...])Create a Grid object and optionally populate from xml tree.
Look for an equivalent existing RESQML object and modify the uuid of this object if found.
create_xml
([ext_uuid, add_as_part, ...])Creates an IJK grid node from a grid object and optionally adds to parts forest.
append_extra_metadata
(meta_dict)Append a given dictionary of metadata to the existing metadata.
__eq__
(other)Implements equals operator; uses is_equivalent() otherwise compares class type and uuid.
__ne__
(other)Implements not equal operator.
__repr__
()String representation.
- __init__(parent_model, uuid=None, find_properties=True, geometry_required=True, title=None, originator=None, extra_metadata={})[source]¶
Create a Grid object and optionally populate from xml tree.
- Parameters
parent_model (model.Model object) – the model which this grid is part of
uuid (uuid.UUID, optional) – if present, the new grid object is populated from the RESQML object
find_properties (boolean, default True) – if True and uuid is present, a grid property collection is instantiated as an attribute, holding properties for which this grid is the supporting representation
geometry_required (boolean, default True) – if True and no geometry node exists in the xml, an assertion error is raised; ignored if uuid is None
title (str, optional) – citation title for new grid; ignored if loading from xml
originator (str, optional) – name of person creating the grid; defaults to login id; ignored if loading from xml
extra_metadata (dict, optional) – dictionary of extra metadata items to add to the grid; ignored if loading from xml
- Returns
a newly created Grid object
Notes
only IJK grids are handled at the moment (the resqml standard also defines 5 other varieties)
- actual_pillar_shape(patch_metadata=False, tolerance=0.001)[source]¶
Returns actual shape of pillars.
- Parameters
patch_metadata (boolean, default False) – if True, the actual shape replaces whatever was in the metadata
tolerance (float, default 0.001) – a length value (in units of grid xy units) used as a Manhattan distance limit in the xy plane when considering whether a point lies ‘on’ a straight line
- Returns
string – ‘vertical’, ‘straight’ or ‘curved’
Note
setting patch_metadata True will affect the attribute in this Grid object; however, it will not be preserved unless the create_xml() method is called, followed at some point with model.store_epc()
- append_extra_metadata(meta_dict)¶
Append a given dictionary of metadata to the existing metadata.
- bounding_box(cell_kji0, points_root=None, cache_cp_array=False)[source]¶
Returns the xyz box which envelopes the specified cell, as a numpy array of shape (2, 3).
- cache_all_geometry_arrays()[source]¶
Loads from hdf5 into memory all the arrays defining the grid geometry.
- Returns
None
Notes
call this method if much grid geometry processing is coming up, to save having to worry about individual caching arguments to many other methods; this method does not create a column to pillar mapping which will often also be needed; the arrays are cached as direct attributes to this grid object; the names, shapes and types of the attributes are:
array_cell_geometry_is_defined (nk, nj, ni) bool array_pillar_geometry_is_defined (nj + 1, ni + 1) bool points_cached (nk + 1, nj + 1, ni + 1, 3) or (nk + 1, np, 3) float (np = number of primary pillars) split_pillar_indices_cached (nps) int (nps = number of primary pillars that are split) cols_for_split_pillars (npxc) int (npxc = number of column corners using extra pillars due to splitting) cols_for_split_pillars_cl (npx) int (npx = number of extra pillars due to splitting)
the last 3 are only present when the grid has one or more split pillars; the split pillar data includes the use of a ‘jagged’ array (effectively an array of lists represented as a linear array and a ‘cumulative length’ index array)
- cell_count(active_only=False, non_pinched_out_only=False, geometry_defined_only=False)[source]¶
Returns number of cells in grid; optionally limited by active, non-pinched-out, or having geometry.
- Parameters
active_only (boolean, default False) – if True, the count of active cells is returned
non_pinched_out_only (boolean, default False) – if True, the count of cells with vertical thickness greater than 0.001 (units are crs vertical units) is returned
geometry_defined_only (boolean, default False) – if True, the count of cells which have a defined geometry is returned (a zero thickness cell may still have a defined geometry)
- Returns
integer being the number of cells in the grid
- cell_geometry_is_defined(cell_kji0=None, cell_geometry_is_defined_root=None, cache_array=True)[source]¶
Returns True if the geometry of the specified cell is defined.
Can also be used to cache (load) the boolean array.
- Parameters
cell_kji0 (triplet of integer, optional) – if present, the index of the cell of interest, in kji0 protocol; if False, None is returned but the boolean array can still be cached
cell_geometry_is_defined_root (optional) – if present, the root of the ‘cell geometry is defined’ xml tree for this grid; this optional argument is to allow for speed optimisation, to save searching for the node
cache_array (boolean, default True) – if True, the ‘cell geometry is defined’ array is cached in memory, unless the xml tree indicates that geometry is defined for all cells, in which case that is noted
- Returns
if cell_kji0 is not None, a boolean is returned indicating whether geometry is defined for that cell; if cell_kji0 is None, None is returned (but the array caching logic will have been applied)
- cell_geometry_is_defined_ref()[source]¶
Returns an in-memory numpy array containing the boolean data indicating which cells have geometry defined.
- Returns
numpy array of booleans of shape (nk, nj, ni); True value indicates cell has geometry defined; False indicates that the cell’s geometry (points xyz values) cannot be used
Note
if geometry is flagged in the xml as being defined for all cells, then this function returns None; geometry_defined_for_all_cells() can be used to test for that situation
- centre_point(cell_kji0=None, cache_centre_array=False)[source]¶
Returns centre point of a cell or array of centre points of all cells.
Optionally cache centre points for all cells.
- Parameters
cell_kji0 (optional) – if present, the (k, j, i) indices of the individual cell for which the centre point is required; zero based indexing
cache_centre_array (boolean, default False) – If True, or cell_kji0 is None, an array of centre points is generated and added as an attribute of the grid, with attribute name array_centre_point
- Returns
(x, y, z) 3 element numpy array of floats holding centre point of cell; or numpy 3+1D array if cell_kji0 is None
Note
resulting coordinates are in the same (local) crs as the grid points
- centre_point_list(cell_kji0s)[source]¶
Returns centre points for a list of cells; caches centre points for all cells.
- Parameters
cell_kji0s (numpy int array of shape (N, 3)) – the (k, j, i) indices of the individual cells for which the centre points are required; zero based indexing
- Returns
numpy float array of shape (N, 3) being the (x, y, z) centre points of the cells
Note
resulting coordinates are in the same (local) crs as the grid points
- check_top_and_base_cell_edge_directions()[source]¶
Check grid top face I & J edge vectors (in x,y) against basal equivalents.
Max 90 degree angle tolerated.
- Returns
boolean – True if all checks pass; False if one or more checks fail
Notes
similarly checks cell edge directions in neighbouring cells in top (and separately in base) currently requires geometry to be defined for all pillars logs a warning if a check is not passed
- property citation_title¶
Citation block title equivalent to self.title.
- column_is_inactive(col_ji0)[source]¶
Returns True if all the cells in the specified column are inactive.
- Parameters
col_ji0 (int pair) – the (j0, i0) column indices
- Returns
boolean – True if all the cells in the column are inactive; False if at least one cell is active
- combined_tr_mult_properties_from_gcs_mults(gcs_uuid_list=None, realization=None, merge_mode='minimum', sided=None, fill_value=1.0, active_only=True)[source]¶
Add triplet of transmissibility multiplier properties by combining gcs properties.
- Parameters
gcs_uuid_list (list of UUID, optional) – if None, all grid connection sets related to this grid will be used
realization (int, optional) – if present, is used to filter tranmissibility multiplier input properties and is added to the output properties
merge_mode (str, default 'minimum') – one of ‘minimum’, ‘multiply’, ‘maximum’, ‘exception’; how to handle multiple values applicable to the same grid face
sided (bool, optional) – whether to apply values on both sides of each gcs cell-face pair; if None, will default to False if merge mode is multiply, True otherwise
fill_value (float, optional, default 1.0) – the value to use for grid faces not present in any of the gcs’es; if None, NaN will be used
active_only (bool, default True) – if True and an active property exists for a grid connection set, then only active faces are used when combining to make the grid face properties
- Returns
list of 3 uuids, one for each of the newly created transmissibility multiplier properties
Notes
each grid connection set must refer to this grid only; the generated properties have indexable element ‘faces’, not ‘faces per cell’, so may not be suitable for faulted grids
- composite_bounding_box(bounding_box_list)[source]¶
Returns the xyz box which envelopes all the boxes in the list, as a numpy array of shape (2, 3).
- coordinate_line_end_points()[source]¶
Returns xyz of top and bottom of each primary pillar.
- Returns
numpy float array of shape (nj + 1, ni + 1, 2, 3)
- corner_points(cell_kji0=None, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns a numpy array of corner points for a single cell or the whole grid.
Notes
if cell_kji0 is not None, a 4D array of shape (2, 2, 2, 3) holding single cell corner points in logical order [kp, jp, ip, xyz] is returned; if cell_kji0 is None, a pagoda style 7D array [k, j, i, kp, jp, ip, xyz] is cached and returned; the ordering of the corner points is in the logical order, which is not the same as that used by Nexus CORP data; olio.grid_functions.resequence_nexus_corp() can be used to switch back and forth between this pagoda ordering and Nexus corp ordering; this is the usual way to access full corner points for cells where working with native resqml data is undesirable
- create_column_pillar_mapping()[source]¶
Creates an array attribute holding set of 4 pillar indices for each I, J column of cells.
- Returns
numpy integer array of shape (nj, ni, 2, 2) where the last two indices are jp, ip; the array contains the pillar index for each of the 4 corners of each column of cells
Notes
the array is also cached as an attribute of the grid object: grid.pillars_for_column for grids with split coordinates lines (faults), this array allows for fast access to the correct pillar data for the corner of a column of cells; here and elsewhere, ip & jp (& kp) refer to a 0 or 1 index which determines the side of a cell, ip & jp together select one of the four corners of a column; the pillar index is a single integer, which is used as the second index into the points array for a grid geometry with split pillars; for unsplit grid geometries, such a pillar index must be converted back into a j’, i’ pair of indices (or the points array must be reshaped to combine the two indices into one)
- create_xml(ext_uuid=None, add_as_part=True, add_relationships=True, set_as_grid_root=True, title=None, originator=None, write_active=True, write_geometry=True, use_lattice=False, extra_metadata={})[source]¶
Creates an IJK grid node from a grid object and optionally adds to parts forest.
- Parameters
ext_uuid (uuid.UUID) – the uuid of the hdf5 external part holding the array data for the grid geometry
add_as_part (boolean, default True) – if True, the newly created xml node is added as a part in the model
add_relationships (boolean, default True) – if True, relationship xml parts are created relating the new grid part to: the crs, and the hdf5 external part
set_as_grid_root (boolean, default True) – if True, the new grid node is noted as being the ‘main’ grid for the model
title (string, default 'ROOT') – used as the citation Title text; careful consideration should be given to this argument when dealing with multiple grids in one model, as it is the means by which a human will distinguish them
originator (string, optional) – the name of the human being who created the ijk grid part; default is to use the login name
write_active (boolean, default True) – if True, xml for an active cell property is also generated, but only if the active_property_uuid is set and no part exists in the model for that uuid
write_geometry (boolean, default True) – if False, the geometry node is omitted from the xml
use_lattice (boolean, default False) – if True and write_geometry is True, a lattice representation is used for the geometry (only for RegularGrid objects)
extra_metadata (dict) – any key value pairs in this dictionary are added as extra metadata xml nodes
- Returns
the newly created ijk grid xml node
Notes
- this code has the concept of a ‘main’ grid for a model, which resqml does not; it is vaguely
equivalent to a ‘root’ grid in a simulation model
the write_active argument should generally be set to the same value as that passed to the write_hdf5… method; the RESQML standard allows the geometry to be omitted for a grid, controlled here by the write_geometry argument; the explicit geometry may be omitted for regular grids, in which case the arrays should not be written to the hdf5 file either
- denaturalized_cell_index(c0)[source]¶
Returns a 3 element cell_kji0 index (as a tuple) for the cell with given natural index.
- denaturalized_cell_indices(c0s)[source]¶
Returns an integer array holding kji0 indices for the cells with given natural indices.
- argument:
c0s: numpy integer array of shape (…,) being natural cell indices (for a flattened array)
- Returns
numpy integer array of shape (…, 3) being the equivalent kji0 protocol cell indices
- extract_children()[source]¶
Looks for LGRs related to this grid and sets the local_grid_uuid_list attribute.
- extract_crs_uuid()[source]¶
Returns uuid for coordinate reference system, as stored in geometry xml tree.
- Returns
uuid.UUID object
- extract_extent_kji()[source]¶
Returns the grid extent; for IJK grids this is a 3 integer numpy array, order is Nk, Nj, Ni.
- Returns
numpy int array of shape (3,) being number of cells in k, j & i axes respectively; the return value is cached in attribute extent_kji, which can alternatively be referenced directly by calling code as the value is set from xml on initialisation
- extract_geometry_time_index()[source]¶
Returns integer time index, or None, for the grid geometry, as stored in xml for dynamic geometries.
Notes
if the value is not None, it represents the time index as stored in the xml, or the time index as updated when setting the node points from a points property
- extract_grid_is_right_handed()[source]¶
Returns boolean indicating whether grid IJK axes are right handed, as stored in xml.
- Returns
boolean – True if grid is right handed; False if left handed
Notes
this is the actual handedness of the IJK indexing of grid cells; the coordinate reference system has its own implicit handedness for xyz axes; Nexus requires the IJK space to be righthanded so if it is not, the handedness of the xyz space is falsified when exporting for Nexus (as Nexus allows xyz to be right or lefthanded and it is the handedness of the IJK space with respect to the xyz space that matters)
- extract_has_split_coordinate_lines()[source]¶
Returns boolean indicating whether grid geometry has any split coordinate lines (split pillars, ie. faults).
- Returns
boolean – True if the grid has one or more split pillars; False if all pillars are unsplit
Notes
the return value is based on the array elements present in the xml tree, unless it has already been determined; resqml ijk grids with split coordinate lines have extra arrays compared to unfaulted grids, and the main Points array is indexed differently: [k’, pillar_index, xyz] instead of [k’, j’, i’, xyz] (where k’, j’, i’ range of nk+k_gaps+1, nj+1, ni+1 respectively)
- extract_inactive_mask(check_pinchout=False)[source]¶
Returns boolean numpy array indicating which cells are inactive, if (in)active property found in this grid.
- Returns
numpy array of booleans, of shape (nk, nj, ni) being True for cells which are inactive; False for active
Note
RESQML does not have a built-in concept of inactive (dead) cells, though the usage guide advises to use a discrete property with a local property kind of ‘active’; this resqpy code can maintain an ‘inactive’ attribute for the grid object, which is a boolean numpy array indicating which cells are inactive
- extract_k_direction_is_down()[source]¶
Returns boolean indicating whether increasing K indices are generally for deeper cells, as stored in xml.
- Returns
boolean – True if increasing K generally indicates increasing depth
Notes
resqml allows layers to fold back over themselves, so the relationship between k and depth might not be monotonic; higher level code sometimes requires k to increase with depth; independently of this, z values may increase upwards or downwards in a coordinate reference system; this method does not modify the grid_is_righthanded indicator
- extract_k_gaps()[source]¶
Returns information about gaps (voids) between layers in the grid.
- Returns
(int, numpy bool array, numpy int array) being the number of gaps between layers; a 1D bool array of extent nk-1 set True where there is a gap below the layer; and a 1D int array being the k index to actually use in the points data for each layer k0
Notes
all returned elements are stored as attributes in the grid object; int and bool array elements will be None if there are no k gaps; each k gap implies an extra element in the points data for each pillar; when wanting to index k interfaces (horizons) rather than layers, the last of the returned values can be used to index the k axis of the points data to yield the top face of the layer and the successor in k will always index the basal face of the same layer
- extract_pillar_shape()[source]¶
Returns string indicating whether whether pillars are curved, straight, or vertical as stored in xml.
- Returns
string – either ‘curved’, ‘straight’ or ‘vertical’
Note
resqml datasets often have ‘curved’, even when the pillars are actually ‘vertical’ or ‘straight’; use actual_pillar_shape() method to determine the shape from the actual xyz points data
- extract_property_collection()[source]¶
Load grid property collection object holding lists of all properties in model that relate to this grid.
- Returns
resqml_property.GridPropertyCollection object
Note
a reference to the grid property collection is cached in this grid object; if the properties change, for example by generating some new properties, the property_collection attribute of the grid object would need to be reset to None elsewhere before calling this method again
- face_centre(cell_kji0, axis, zero_or_one, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns xyz location of the centre point of a face of the cell (or all cells).
- face_centres_kji_01(cell_kji0, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns an array of shape (3, 2, 3) being (axis, 0 or 1, xyz) of face centre points for cell.
- fault_connection_set(skip_inactive=True, compute_transmissibility=False, add_to_model=False, realization=None, inherit_features_from=None, title='fault juxtaposition set')[source]¶
Returns (and caches) a GridConnectionSet representing juxtaposition across faces with split pillars.
- Parameters
skip_inactive (boolean, default True) – if True, then cell face pairs involving an inactive cell will be omitted from the results
compute_transmissibilities (boolean, default False) – if True, then transmissibilities will be computed for the cell face pairs (unless already existing as a cached attribute of the grid)
add_to_model (boolean, default False) – if True, the connection set is written to hdf5 and xml is created; if compute_transmissibilty is True then the transmissibility property is also added
realization (int, optional) – if present, is used as the realization number when adding transmissibility property to model; ignored if compute_transmissibility is False
inherit_features_from (GridConnectionSet, optional) – if present, the features (named faults) are inherited from this grid connection set based on a match of either cell face in a juxtaposed pair
title (string, default 'fault juxtaposition set') – the citation title to use if adding to model
- Returns
GridConnectionSet, numpy float array of shape (count,) transmissibilities (or None), where count is the number of cell face pairs in the grid connection set, which contains entries for all juxtaposed faces with a split pillar as an edge; if the grid does not have split pillars (ie. is unfaulted) or there are no qualifying connections, (None, None) is returned
- fault_throws()[source]¶
Finds mean throw of each J and I face; adds throw arrays as attributes to this grid and returns them.
Note
this method is deprecated, or due for overhaul to make compatible with resqml_fault module and the GridConnectionSet class
- fault_throws_per_edge_per_column(mode='maximum', simple_z=False, axis_polarity_mode=True)[source]¶
Return array holding max, mean or min throw based on split node separations.
- Parameters
mode (string, default 'maximum') – one of ‘minimum’, ‘mean’, ‘maximum’; determines how to resolve variation in throw for each column edge
simple_z (boolean, default False) – if True, the returned throw values are vertical offsets; if False, the displacement in xyz space between split points is the basis of the returned values and may include a lateral offset component as well as xy displacement due to sloping pillars
axis_polarity (boolean, default True) – determines shape and ordering of returned array; if True, the returned array has shape (nj, ni, 2, 2); if False the shape is (nj, ni, 4); see return value notes for more information
- Returns
- numpy float array of shape (nj, ni, 2, 2) or (nj, ni, 4) holding fault throw values for each column edge; units are
z units of crs for this grid; if simple_z is False, xy units and z units must be the same; positive values indicate greater depth if z is increasing downwards (or shallower if z is increasing upwards); negative values indicate the opposite; the shape and ordering of the returned array is determined by axis_polarity_mode; if axis_polarity_mode is True, the returned array has shape (nj, ni, 2, 2) with the third index being axis (0 = J, 1 = I) and the final index being polarity (0 = minus face edge, 1 = plus face edge); if axis_polarity_mode is False, the shape is (nj, ni, 4) and the face edges are ordered I-, J+, I+, J-, as required by the resqml standard for a property with indexable element ‘edges per column’
Notes
the throws calculated by this method are based merely on grid geometry and do not refer to grid connection sets; NB: the same absolute value is returned, with opposite sign, for the edges on opposing sides of a fault; either one of these alone indicates the full throw; the property module contains a pair of reformatting functions for moving an array between the two axis polarity modes; minimum and maximum modes work on the absolute throws
- find_cell_for_point_xy(x, y, k0=0, vertical_ref='top', local_coords=True)[source]¶
Searches in 2D for a cell containing point x,y in layer k0; return (j0, i0) or (None, None).
- find_faults(set_face_sets=False, create_organizing_objects_where_needed=False)[source]¶
Searches for column-faces that are faulted and assigns fault ids; creates list of column-faces per fault id.
Note
this method is deprecated, or due for overhaul to make compatible with resqml_fault module and the GridConnectionSet class
- geometry_defined_for_all_cells(cache_array=True)[source]¶
Returns True if geometry is defined for all cells; False otherwise.
- argument:
- cache_array (boolean, default True): if True, the ‘cell geometry is defined’ array is cached in memory,
unless the xml indicates that geometry is defined for all cells, in which case that is noted
- Returns
boolean – True if geometry is defined for all cells; False otherwise
- geometry_defined_for_all_pillars(cache_array=True, pillar_geometry_is_defined_root=None)[source]¶
Returns True if geometry is defined for all pillars; False otherwise.
- Parameters
cache_array (boolean, default True) – if True, the ‘pillar geometry is defined’ array is cached in memory, unless the xml indicates that geometry is defined for all pillars, in which case that is noted
pillar_geometry_is_defined_root (optional) – if present, the root of the ‘pillar geometry is defined’ xml tree for this grid; this optional argument is to allow for speed optimisation, to save searching for the node
- Returns
boolean – True if the geometry is defined for all pillars; False otherwise
- get_represented_interpretation()[source]¶
Establishes the represented interpretation uuid, as stored in the xml tree, if present
- get_volume_conversion_factor(required_uom)[source]¶
Returns a factor for converting volumes calculated in the grid’s CRS to the required uom.
- get_volume_uom(required_uom)[source]¶
Returns a RESQML unit of measure string to use for volume quantities for the grid.
- Parameters
required_uom (str, optional) – if present, the RESQML unit of measure (for quantity volume) to use
- Returns
string holding a valid RESQML uom for quantity class volume
- global_to_local_crs(a, crs_uuid, global_xy_units=None, global_z_units=None, global_z_increasing_downward=None)[source]¶
Converts array of points in situ from global coordinate system to established local one.
- half_cell_transmissibility(use_property=True, realization=None, tolerance=1e-06)[source]¶
Returns (and caches if realization is None) half cell transmissibilities for this grid.
- Parameters
use_property (boolean, default True) – if True, the grid’s property collection is inspected for a possible half cell transmissibility array and if found, it is used instead of calculation
realization (int, optional) –
tolerance (float, default 1.0e-6) – minimum half axis length below which the transmissibility will be deemed uncomputable (for the axis in question); NaN values will be returned (not Inf); units are implicitly those of the grid’s crs length units
- Returns
- numpy float array of shape (nk, nj, ni, 3, 2) where the 3 covers K,J,I and the 2 covers the
face polarity: - (0) and + (1); units will depend on the length units of the coordinate reference system for the grid; the units will be m3.cP/(kPa.d) or bbl.cP/(psi.d) for grid length units of m and ft respectively
Notes
the returned array is in the logical resqpy arrangement; it must be discombobulated before being added as a property; this method does not write to hdf5, nor create a new property or xml; if realization is None, a grid attribute cached array will be used; tolerance will only be used if the half cell transmissibilities are actually computed
- horizon_points(ref_k0=0, heal_faults=False, kp=0)[source]¶
Returns reference to a points layer array of shape ((nj + 1), (ni + 1), 3) based on primary pillars.
- Parameters
ref_k0 (integer) – the horizon layer number, in the range 0 to nk (or layer number in range 0..nk-1 in the case of grids with k gaps)
heal_faults (boolean, default False) – if True and the grid has split coordinate lines, an unsplit equivalent of the grid points is generated first and the returned points are based on that data; otherwise, the primary pillar data is used, which effectively gives a point from one side or another of any faults, rather than an averaged point
kp (integer, default 0) – set to 1 to specify the base of layer ref_k0, in case of grids with k gaps
- Returns
a numpy array of floats of shape ((nj + 1), (ni + 1), 3) being the (shared) cell corner point locations for the plane of points, based on the primary pillars or unsplit equivalent pillars
Notes
the primary pillars are the ‘first’ set of points for a pillar; a split pillar will have one to three other sets of point data but those are ignored by this function unless heal_faults is True, in which case an averaged point will be used for the split pillars; to get full unhealed representation of split horizon points, use split_horizon_points() function instead; for grids without k gaps, ref_k0 can be used alone, in the range 0..nk, to identify the horizon; alternatively, or for grids with k gaps, the ref_k0 can specify the layer in the range 0..nk-1, with kp being passed the value 0 (default) for the top of the layer, or 1 for the base of the layer
- interface_length(cell_kji0, axis, points_root=None, cache_resqml_array=True, cache_cp_array=False, required_uom=None)[source]¶
Returns the length between centres of an opposite pair of faces of the cell.
Note
if required_uom is not specified, units of returned length are the grid’s crs xy units
- interface_lengths_kji(cell_kji0, points_root=None, cache_resqml_array=True, cache_cp_array=False, required_uom=None)[source]¶
Returns 3 interface centre point separation lengths for axes k, j, i.
Note
if required_uom is not specified, units of returned length are the grid’s crs xy units
- interface_vector(cell_kji0, axis, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns an xyz vector between centres of an opposite pair of faces of the cell (or vectors for all cells).
Note
units are implicitly those of the grid’s crs; differing xy & z units would imply that the direction of the vector is not a true direction
- interface_vectors_kji(cell_kji0, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns 3 interface centre point difference vectors for axes k, j, i.
Note
units are implicitly those of the grid’s crs; differing xy & z units would imply that the direction of the vectors are not true directions
- interpolated_point(cell_kji0, interpolation_fraction, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns xyz point interpolated from corners of cell.
Depends on 3 interpolation fractions in range 0 to 1.
- interpolated_points(cell_kji0, interpolation_fractions, points_root=None, cache_resqml_array=True, cache_cp_array=False)[source]¶
Returns xyz points interpolated from corners of cell.
Depending on 3 interpolation fraction numpy vectors, each value in range 0 to 1.
- Parameters
cell_kji0 (triple int) – indices of individual cell whose corner points are to be interpolated
interpolation_fractions (list of three numpy vectors of floats) – k, j & i interpolation fraction vectors, each element in range 0 to 1
points_root (xml node, optional) – for efficiency when making multiple calls, this can be set to the xml node of the points data
cache_resqml_array (boolean, default True) – if True, the resqml points data will be cached as an attribute of this grid object
cache_cp_array (boolean, default False) – if True a fully expanded 7D corner points array will be established for this grid and cached as an attribute (recommended if looping over many or all the cells and if memory space allows)
- Returns
4D numpy float array of shape (nik, nij, nii, 3) being the interpolated points; nik is the number of elements in the first of the interpolation fraction lists (ie. for k); similarly for nij and nii; the final axis covers xyz
- notea:
this method returns a lattice of trilinear interpolations of the corner point of the host cell; the returned points are in ‘shared’ arrangement (like resqml points data for an IjkGrid without split pillars or k gaps), not a fully expanded 7D array; calling code must redistribute to corner points of individual fine cells if that is the intention
- invalidate_corner_points()[source]¶
Deletes cached copy of corner points, if present.
Use if any pillar geometry changes, or to reclaim memory.
- is_split_column_face(j0, i0, axis, polarity)[source]¶
Returns True if the I or J column face is split; False otherwise.
- k_gap_connection_set(skip_inactive=True, compute_transmissibility=False, add_to_model=False, realization=None, tolerance=0.001)[source]¶
Returns (and caches) a GridConnectionSet representing juxtaposition across zero thickness K gaps.
- Parameters
skip_inactive (boolean, default True) – if True, then cell face pairs involving an inactive cell will be omitted from the results
compute_transmissibilities (boolean, default False) – if True, then transmissibilities will be computed for the cell face pairs (unless already existing as a cached attribute of the grid)
add_to_model (boolean, default False) – if True, the connection set is written to hdf5 and xml is created; if compute_transmissibilty is True then the transmissibility property is also added
realization (int, optional) – if present, is used as the realization number when adding transmissibility property to model; ignored if compute_transmissibility is False
tolerance (float, default 0.001) – the maximum K gap thickness that will be ‘bridged’ by a connection; units are implicitly those of the z units in the grid’s coordinate reference system
- Returns
GridConnectionSet, numpy float array of shape (count,) transmissibilities (or None), where count is the number of cell face pairs in the grid connection set, which contains entries for all juxtaposed K faces separated logically by pinched out (zero thickness) cells; if there are no pinchouts (or no qualifying connections) then (None, None) will be returned
Note
if cached values are found they are returned regardless of the specified tolerance
- local_to_global_crs(a, crs_uuid, global_xy_units=None, global_z_units=None, global_z_increasing_downward=None)[source]¶
Converts array of points in situ from local coordinate system to global one.
- make_face_set_from_dataframe(df)[source]¶
Creates a curtain face set for each named fault in dataframe.
Note
this method is deprecated, or due for overhaul to make compatible with resqml_fault module and the GridConnectionSet class
- make_face_sets_from_pillar_lists(pillar_list_list, face_set_id, axis='K', ref_slice0=0, plus_face=False, projection='xy')[source]¶
Creates a curtain face set for each pillar (or rod) list.
- Returns
(face_set_dict, full_pillar_list_dict)
Note
‘xz’ and ‘yz’ projections currently only supported for unsplit grids
- natural_cell_index(cell_kji0)[source]¶
Returns a single integer for the cell, being the index into a flattened array.
- natural_cell_indices(cell_kji0s)[source]¶
Returns a numpy integer array with a value for each of the cells, being the index into a flattened array.
- argument:
cell_kji0s: numpy integer array of shape (…, 3) being a list of cell indices in kji0 protocol
- Returns
numpy integer array of shape (…,) being the equivalent natural cell indices (for a flattened array of cells)
- nearest_pillar(xy, ref_k0=0, kp=0)[source]¶
Returns the (j0, i0) indices of the primary pillar with point closest in x,y plane to point xy.
- nearest_rod(xyz, projection, axis, ref_slice0=0, plus_face=False)[source]¶
Returns the (k0, j0) or (k0 ,i0) indices of the closest point(s) to xyz(s); projection is ‘xy’, ‘xz’ or ‘yz’.
Note
currently only for unsplit grids
- property nk_plus_k_gaps¶
Returns the number of layers including any K gaps.
- property part¶
Standard part name corresponding to self.uuid.
- pillar_distances_sqr(xy, ref_k0=0, kp=0, horizon_points=None)[source]¶
Returns array of the square of the distances of primary pillars in x,y plane to point xy.
- Parameters
xy (float pair) – the xy coordinate to compute the pillar distances to
ref_k0 (int, default 0) – the horizon layer number to use
horizon_points (numpy array, optional) – if present, should be array as returned by horizon_points() method; pass for efficiency in case of multiple calls
- pillar_foursome(ji0, none_if_unsplit=False)[source]¶
Returns an int array of the natural pillar indices applicable to each column around primary.
- Parameters
ji0 (pair of ints) – the pillar indices (j0, i0) of the primary pillar of interest
none_if_unsplit (boolean, default False) – if True and the primary pillar is unsplit, None is returned; if False, a foursome is returned full of the natural index of the primary pillar
- Returns
numpy int array of shape (2, 2) being the natural pillar indices (second axis index in raw points array) applicable to each of the four columns around the primary pillar; axes of foursome are (jp, ip); if the primary pillar is unsplit, None is returned if none_if_unsplit is set to True, otherwise the foursome as usual
- pillar_geometry_is_defined(pillar_ji0=None, pillar_geometry_is_defined_root=None, cache_array=True)[source]¶
Returns True if the geometry of the specified pillar is defined; False otherwise.
Can also be used to cache (load) the boolean array.
- Parameters
pillar_ji0 (pair of integers, optional) – if present, the index of the pillar of interest, in ji0 protocol; if False, None is returned but the boolean array can still be cached
pillar_geometry_is_defined_root (optional) – if present, the root of the ‘pillar geometry is defined’ xml tree for this grid; this optional argument is to allow for speed optimisation, to save searching for the node
cache_array (boolean, default True) – if True, the ‘pillar geometry is defined’ array is cached in memory, unless the xml tree indicates that geometry is defined for all pillars, in which case that is noted
- Returns
if pillar_ji0 is not None, a boolean is returned indicating whether geometry is defined for that pillar; if pillar_ji0 is None, None is returned unless geometry is defined for all pillars in which case True is returned
- pillar_geometry_is_defined_ref()[source]¶
Returns an in-memory numpy array containing the boolean data indicating which pillars have geometry defined.
- Returns
numpy array of booleans of shape (nj + 1, ni + 1); True value indicates pillar has geometry defined (at least for some points); False indicates that the pillar’s geometry (points xyz values) cannot be used; the resulting array only covers primary pillars; extra pillars for split pillars always have geometry defined
Note
if geometry is flagged in the xml as being defined for all pillars, then this function returns None
- pinched_out(cell_kji0=None, tolerance=0.001, points_root=None, cache_resqml_array=True, cache_cp_array=False, cache_thickness_array=False, cache_pinchout_array=None)[source]¶
Returns boolean or boolean array indicating whether cell is pinched out.
Pinched out means cell has a thickness less than tolerance.
- pinchout_connection_set(skip_inactive=True, compute_transmissibility=False, add_to_model=False, realization=None)[source]¶
Returns (and caches) a GridConnectionSet representing juxtaposition across pinched out cells.
- Parameters
skip_inactive (boolean, default True) – if True, then cell face pairs involving an inactive cell will be omitted from the results
compute_transmissibilities (boolean, default False) – if True, then transmissibilities will be computed for the cell face pairs (unless already existing as a cached attribute of the grid)
add_to_model (boolean, default False) – if True, the connection set is written to hdf5 and xml is created; if compute_transmissibilty is True then the transmissibility property is also added
realization (int, optional) – if present, is used as the realization number when adding transmissibility property to model; ignored if compute_transmissibility is False
- Returns
GridConnectionSet, numpy float array of shape (count,) transmissibilities (or None), where count is the number of cell face pairs in the grid connection set, which contains entries for all juxtaposed K faces separated logically by pinched out (zero thickness) cells; if there are no pinchouts (or no qualifying connections) then (None, None) will be returned
- pixel_map_for_split_horizon_points(horizon_points, origin, width, height, dx, dy=None)[source]¶
Makes a mapping from pixels to cell j, i indices, based on split horizon points for a single horizon.
- Parameters
horizon_points (numpy array of shape (nj, ni, 2, 2, 2+)) – corner point x,y,z values for cell corners (j, i, jp, ip); as returned by split_horizon_points()
origin (float pair) – x, y of south west corner of area covered by pixel rectangle, in local crs
width (int) – the width of the pixel rectangle (number of pixels)
height (int) – the height of the pixel rectangle (number of pixels)
dx (float, optional) – the size (west to east) of a pixel, in locel crs
dx – the size (south to north) of a pixel, in locel crs; defaults to dx
- Returns
numpy int array of shape (height, width, 2), being the j, i indices of cells that the pixel centres lie within; values of -1 are used as null (ie. pixel not within any cell)
- pixel_maps(origin, width, height, dx, dy=None, k0=None, vertical_ref='top')[source]¶
Makes a mapping from pixels to cell j, i indices, based on split horizon points for a single horizon.
- Parameters
origin (float pair) – x, y of south west corner of area covered by pixel rectangle, in local crs
width (int) – the width of the pixel rectangle (number of pixels)
height (int) – the height of the pixel rectangle (number of pixels)
dx (float) – the size (west to east) of a pixel, in locel crs
dy (float, optional) – the size (south to north) of a pixel, in locel crs; defaults to dx
k0 (int, default None) – if present, the single layer to create a 2D pixel map for; if None, a 3D map is created with one layer per layer of the grid
vertical_ref (string, default 'top') – ‘top’ or ‘base’
- Returns
numpy int array of shape (height, width, 2), or (nk, height, width, 2), being the j, i indices of cells that the pixel centres lie within; values of -1 are used as null (ie. pixel not within any cell)
- point(cell_kji0=None, corner_index=array([0, 0, 0]), points_root=None, cache_array=True)[source]¶
Return a cell corner point xyz; can optionally be used to cache points data.
- Parameters
cell_kji0 (3 integers, optional) – if not None, the index of the cell for the point of interest, in kji0 protocol
corner_index (3 integers, default zeros) – the kp, jp, ip corner-within-cell indices (each 0 or 1)
points_root (optional) – the xml node holding the points data
cache_array (boolean, default True) – if True, the raw points data is cached in memory as a side effect
- Returns
(x, y, z) of selected point as a 3 element numpy vector, or None if cell_kji0 is None
Note
if cell_kji0 is passed, the k0 value should be the layer index before adjustment for k_gaps, which this method will apply
- point_areally(tolerance=0.001)[source]¶
Returns array indicating which cells are reduced to a point in both I & J axes.
- Returns
numopy bool array of shape extent_kji
Note
Any NaN point values will yield True for a cell
- point_raw(index=None, points_root=None, cache_array=True)[source]¶
Returns element from points data, indexed as in the hdf5 file; can optionally be used to cache points data.
- Parameters
index (2 or 3 integers, optional) – if not None, the index into the raw points data for the point of interest
points_root (optional) – the xml node holding the points data
cache_array (boolean, default True) – if True, the raw points data is cached in memory as a side effect
- Returns
(x, y, z) of selected point as a 3 element numpy vector, or None if index is None
Notes
this function is typically called either to cache the points data in memory, or to fetch the coordinates of a single point; the details of the indexing depend upon whether the grid has split coordinate lines: if not, the index should be a triple kji0 with axes ranging over the shared corners nk+k_gaps+1, nj+1, ni+1; if there are split pillars, index should be a pair, being the k0 in range nk+k_gaps+1 and a pillar index; note that if index is passed, the k0 element must already have been mapped to the raw index value taking into consideration any k gaps; if the grid object does not include geometry then None is returned
- points_ref(masked=True)[source]¶
Returns an in-memory numpy array containing the xyz data for points used in the grid geometry.
- argument:
- masked (boolean, default True): if True, a masked array is returned with NaN points masked out;
if False, a simple (unmasked) numpy array is returned
- Returns
numpy array or masked array of float, of shape (nk + k_gaps + 1, nj + 1, ni + 1, 3) or (nk + k_gaps + 1, np, 3) where np is the total number of pillars (primary pillars + extras for split pillars)
Notes
this is the usual way to get at the actual grid geometry points data in the native resqml layout; the has_split_coordinate_lines boolean attribute can be used to determine which shape to expect; the shape is (nk + k_gaps + 1, nj + 1, ni + 1, 3) if there are no split coordinate lines (unfaulted); otherwise it is (nk + k_gaps + 1, np, 3), where np > (nj + 1) * (ni + 1), due to extra pillar data for the split pillars
- poly_line_for_cell(cell_kji0, vertical_ref='top')[source]¶
Returns a numpy array of shape (4, 3) being the 4 corners.
Corners are in order J-I-, J-I+, J+I+, J+I-; from the top or base face.
- resolve_geometry_child(tag, child_node=None)[source]¶
If xml child node is None, looks for tag amongst children of geometry root.
- Parameters
tag (string) – the tag of the geometry child node of interest
child_node (optional) – the already resolved xml root of the child, or None
- Returns
xml node of child of geometry node for this grid, which matches tag
Note
if child_node argument is not None, it is simply returned; if child_node is None, the geometry node for this grid is scanned for a child with matching tag
- property root¶
XML node corresponding to self.uuid.
- set_cached_points_from_property(points_property_uuid=None, property_collection=None, realization=None, time_index=None, set_grid_time_index=True, set_inactive=True, active_property_uuid=None, active_collection=None)[source]¶
Modifies the cached points (geometry), setting the values from a points property.
- Parameters
points_property_uuid (uuid, optional) – the uuid of the points property; if present the remaining arguments are ignored except for inactive & active arguments
property_collection (PropertyCollection, optional) – defaults to property collection for the grid; should only contain one set of points properties (but may also contain other non-points properties)
realization (int, optional) – if present, the property in the collection with this realization number is used
time_index (int, optional) – if present, the property in the collection with this time index is used
set_grid_time_index (bool, default True) – if True, the grid’s time index will be set to the time_index argument and the grid’s time series uuid will be set to that referred to by the points property; if False, the grid’s time index will not be modified
set_inactive (bool, default True) – if True, the grid’s inactive mask will be set based on an active cell property
active_property_uuid (uuid, optional) – if present, the uuid of an active cell property to base the inactive mask on; ignored if set_inactive is False
active_collection (uuid, optional) – default’s to property_collection if present, or the grid’s property collection otherwise; only used if set_inactive is True and active_property_uuid is None
Notes
the points property must have indexable element ‘nodes’ and be the same shape as the official points array for the grid; note that the shape of the points array is quite different between grids with split pillars and those without; the uom of the points property must be a length uom and match that used by the grid’s crs; the inactive mask of the grid will only be updated if the set_inactive argument is True; if points_property_uuid has been provided, and set_inactive is True, the active property must be identified with the active_property_uuid argument; if set_inactive is True and active_property_uuid is None and points_property_uuid is None and realization and/or time_index is in use, the active property collection must contain one series of active properties with the same variants (realizations and time indices) as the points property series; the active cell properties should be discrete and have a local property kind titled ‘active’; various cached data are invalidated and cleared by this method
- set_face_set_gcs_list_from_dict(face_set_dict=None, create_organizing_objects_where_needed=False)[source]¶
Creates a grid connection set for each feature in the face set dictionary, based on kelp list pairs.
- set_geometry_is_defined(treat_as_nan=None, treat_dots_as_nan=False, complete_partial_pillars=False, nullify_partial_pillars=False, complete_all=False)[source]¶
Set cached flags and/or arrays indicating which primary pillars have any points defined and which cells all points.
- Parameters
treat_as_nan (float, optional) – if present, any point with this value as x, y or z is changed to hold NaN values, which is the correct RESQML representation of undefined values
treat_dots_as_nan (boolean, default False) – if True, the points around any inactive cell which has zero length along all its I and J edges will be set to NaN (which can intentionally invalidate the geometry of neighbouring cells)
complete_partial_pillars (boolean, default False) – if True, pillars which have some but not all points defined will have values generated for the undefined (NaN) points
nullify_partial_pillars (boolean, default False) – if True, pillars which have some undefined (NaN) points will be treated as if all the points on the pillar are undefined
complete_all (boolean, default False) – if True, values will be generated for all undefined points (includes completion of partial pillars if both partial pillar arguments are False)
Notes
this method discards any previous information about which pillars and cells have geometry defined; the new settings are based solely on where points data is NaN (or has the value supplied as treat_as_nan etc.); the inactive attribute is also updated by this method, though any cells previously flagged as inactive will still be inactive; if points are generated due to either complete… argument being set True, the inactive mask is set prior to generating points, so all cells making use of generated points will be inactive; however, the geometry will show as defined where points have been generated; at most one of complete_partial_pillars and nullify_partial_pillars may be True; although the method modifies the cached (attribute) copies of various arrays, they are not written to hdf5 here
- set_k_direction_from_points()[source]¶
Sets the K direction indicator based on z direction and mean z values for top and base.
Note
this method does not modify the grid_is_righthanded indicator
- set_modified(update_xml=False, update_hdf5=False)[source]¶
Assigns a new uuid to this grid; also calls set_modified() for parent model.
- Parameters
update_xml (boolean, default False) – if True, the uuid is modified in the xml tree for the grid part
update_hdf5 – (boolean, default False): if True, the uuid in the hdf5 internal path names for the datasets (arrays) for the grid are updated
- Returns
the new uuid for this grid object
Notes
a resqml object should be thought of as immutable; therefore when modifying an object, it is preferable to assign it a new unique identifer which this method does for a grid; the hdf5 internal path names held in xml are only updated if both update_xml and update_hdf5 are True; if the grid object has been created using the Model.copy_part() method, it is not necessary to call this function as a new uuid will already have been assigned; NB: relationships are not updated by this function, including the relationship to the hdf5 external part
- set_parent(parent_grid_uuid, self_is_refinement, parent_window)[source]¶
Set relationship with respect to a parent grid.
- Parameters
parent_grid_uuid (uuid.UUID) – the uuid of the parent grid
self_is_refinement (boolean) – if True, this grid is a refinement of the subset of the parent grid; if False, this grid is a coarsening
parent_window – (olio.fine_coarse.FineCoarse object): slice mapping information in K, j & I axes; note that self_is_refinement determines which of the 2 grids is fine and which is coarse
- skin(use_single_layer_tactics=False, is_regular=False)[source]¶
Returns a GridSkin composite surface object reoresenting the outer surface of the grid.
- split_column_faces()[source]¶
Returns a pair of numpy boolean arrays indicating which internal column faces (column edges) are split.
- split_gap_x_section_points(axis, ref_slice0=0, plus_face=False, masked=False)[source]¶
Return array of points representing cell corners from an I or J interface slice for a faulted grid.
- Parameters
axis (string) – ‘I’ or ‘J’ being the axis of the cross-sectional slice (ie. dimension being dropped)
ref_slice0 (int, default 0) – the reference value for indices in I or J (as defined in axis)
plus_face (boolean, default False) – if False, negative face is used; if True, positive
masked (boolean, default False) – if True, a masked numpy array is returned with NaN values masked out
- Returns
a numpy array of shape (nk, nj, 2, 2, 3) or (nk, ni, 2, 2, 3) being the xyz points of the cell corners on the interfacial cross section; 3rd axis is kp; 4th axis is jp or ip; final axis is xyz
Note
this function is intended for split grids with k gaps though will also function for split grids without k gaps
- split_horizon_points(ref_k0=0, masked=False, kp=0)[source]¶
Returns reference to a corner points for a horizon, of shape (nj, ni, 2, 2, 3).
- Parameters
ref_k0 (integer) – the horizon layer number, in the range 0 to nk (or layer number in range 0..nk-1 in the case of grids with k gaps)
masked (boolean, default False) – if True, a masked array is returned with NaN points masked out; if False, a simple (unmasked) numpy array is returned
kp (integer, default 0) – set to 1 to specify the base of layer ref_k0, in case of grids with k gaps
- Returns
numpy array of shape (nj, ni, 2, 2, 3) being corner point x,y,z values for cell corners (j, i, jp, ip)
Notes
if split points are needed for a range of horizons, it is more efficient to call split_horizons_points() than repeatedly call this function; for grids without k gaps, ref_k0 can be used alone, in the range 0..nk, to identify the horizon; alternatively, or for grids with k gaps, the ref_k0 can specify the layer in the range 0..nk-1, with kp being passed the value 0 (default) for the top of the layer, or 1 for the base of the layer
- split_horizons_points(min_k0=None, max_k0=None, masked=False)[source]¶
Returns reference to a corner points layer of shape (nh, nj, ni, 2, 2, 3) where nh is number of horizons.
- Parameters
min_k0 (integer) – the lowest horizon layer number to be included, in the range 0 to nk + k_gaps; defaults to zero
max_k0 (integer) – the highest horizon layer number to be included, in the range 0 to nk + k_gaps; defaults to nk + k_gaps
masked (boolean, default False) – if True, a masked array is returned with NaN points masked out; if False, a simple (unmasked) numpy array is returned
- Returns
numpy array of shape (nh, nj, ni, 2, 2, 3) where nh = max_k0 - min_k0 + 1, being corner point x,y,z values for horizon corners (h, j, i, jp, ip) where h is the horizon (layer interface) index in the range 0 .. max_k0 - min_k0
Notes
data for horizon max_k0 is included in the result (unlike with python ranges); in the case of a grid with k gaps, the horizons points returned will follow the k indexing of the points data and calling code will need to keep track of the min_k0 offset when using k_raw_index_array to select a slice of the horizons points array
- split_x_section_points(axis, ref_slice0=0, plus_face=False, masked=False)[source]¶
Returns an array of points representing cell corners from an I or J interface slice for a faulted grid.
- Parameters
axis (string) – ‘I’ or ‘J’ being the axis of the cross-sectional slice (ie. dimension being dropped)
ref_slice0 (int, default 0) – the reference value for indices in I or J (as defined in axis)
plus_face (boolean, default False) – if False, negative face is used; if True, positive
masked (boolean, default False) – if True, a masked numpy array is returned with NaN values masked out
- Returns
a numpy array of shape (nk + 1, nj, 2, 3) or (nk + 1, ni, 2, 3) being the xyz points of the cell corners on the interfacial cross section; 3rd axis is jp or ip; final axis is xyz
Note
this function will only work for grids with no k gaps; it is intended for split grids though will also function for unsplit grids; use split_gap_x_section_points() if k gaps are present
- thickness(cell_kji0=None, points_root=None, cache_resqml_array=True, cache_cp_array=False, cache_thickness_array=True, property_collection=None)[source]¶
Returns vertical (z) thickness of cell and/or caches thicknesses for all cells.
- Parameters
cell_kji0 (optional) – if present, the (k, j, i) indices of the individual cell for which the thickness is required; zero based indexing
cache_resqml_array (boolean, default True) – If True, the raw points array from the hdf5 file is cached in memory, but only if it is needed to generate the thickness
cache_cp_array (boolean, default True) – If True, an array of corner points is generated and added as an attribute of the grid, with attribute name corner_points, but only if it is needed in order to generate the thickness
cache_thickness_array (boolean, default False) – if True, thicknesses are generated for all cells in the grid and added as an attribute named array_thickness
(property (property_collection) – GridPropertyCollection, optional): If not None, this collection is probed for a suitable thickness or cell length property which is used preferentially to calculating thickness; if no suitable property is found, the calculation is made as if the collection were None
- Returns
float, being the thickness of cell identified by cell_kji0; or numpy float array if cell_kji0 is None
Notes
the function can be used to find the thickness of a single cell, or cache thickness for all cells, or both; if property_collection is not None, a suitable thickness or cell length property will be used if present; if calculated, thickness is defined as z difference between centre points of top and base faces (TVT); at present, assumes K increases with same polarity as z; if not, negative thickness will be calculated; units of result are implicitly those of z coordinates in grid’s coordinate reference system, or units of measure of property array if the result is based on a suitable property
- transmissibility(tolerance=1e-06, use_tr_properties=True, realization=None, modifier_mode=None)[source]¶
Returns transmissibilities for standard (IJK neighbouring) connections within this grid.
- Parameters
tolerance (float, default 1.0e-6) – the minimum half cell transmissibility below which zero inter-cell transmissibility will be set; units are as for returned values (see notes)
use_tr_properties (boolean, default True) – if True, the grid’s property collection is inspected for possible transmissibility arrays and if found, they are used instead of calculation; note that when this argument is False, the property collection is still used for the feed arrays to the calculation
realization (int, optional) – applies to pre-computed transmissibility properties or permeability and net to gross ratio properties when computing
modifier_mode (string, optional) – if None, no transmissibility modifiers are applied; other options are: ‘faces multiplier’, for which directional transmissibility properties with indexable element of ‘faces’ will be used; ‘faces per cell multiplier’, in which case a transmissibility property with ‘faces per cell’ as the indexable element will be used to modify the half cell transmissibilities prior to combination; or ‘absolute’ in which case directional properties of local property kind ‘fault transmissibility’ (or ‘mat transmissibility’) and indexable element of ‘faces’ will be used as a third transmissibility term along with the two half cell transmissibilities at each face; see also the notes below
- Returns
3 numpy float arrays of shape (nk + 1, nj, ni), (nk, nj + 1, ni), (nk, nj, ni + 1) being the neighbourly transmissibilities in K, J & I axes respectively
Notes
the 3 permeability arrays (and net to gross ratio if in use) must be identifiable in the property collection as they are used for the calculation; implicit units of measure of returned values will be m3.cP/(kPa.d) if grid crs length units are metres, bbl.cP/(psi.d) if length units are feet; the computation is compatible with the Nexus NEWTRAN formulation; values will be zero at pinchouts, and at column edges where there is a split pillar, even if there is juxtapostion of faces; the same is true of K gap faces (even where the gap is zero); NaNs in any of the feed properties also result in transmissibility values of zero; outer facing values will always be zero (included to be in accordance with RESQML faces properties); array caching in the grid object will only be used if realization is None; if a modifier mode of ‘faces multiplier’ or ‘faces per cell multiplier’ is specified, properties will be searched for with local property kind ‘transmissibility multiplier’ and the appropriate indexable element (and direction facet in the case of ‘faces multiplier’); the modifier mode of ‘absolute’ can be used to model the effect of faults and thin shales, tar mats etc. in a way which is independent of cell size; for ‘aboslute’ directional properties with indexable element of ‘faces’ and local property kind ‘fault transmissibility’ (or ‘mat transmissibility’) will be used; such absolute faces transmissibilities should have a value of np.inf or np.nan where no modification is required; note that this method is only dealing with logically neighbouring cells and will not compute values for faces with a split pillar, which should be handled elsewhere
- try_reuse()¶
Look for an equivalent existing RESQML object and modify the uuid of this object if found.
- Returns
boolean – True if an equivalent object was found, False if not
Note
by design this method may change this object’s uuid as a side effect
- uncache_points()[source]¶
Frees up memory by removing the cached copy of the grid’s points data.
Note
the memory will only actually become free when any other references to it pass out of scope or are deleted
- unsplit_points_ref(cache_array=False, masked=False)[source]¶
Returns a copy of the points array that has split pillars merged back into an unsplit configuration.
- Parameters
cache_array (boolean, default False) – if True, a copy of the unsplit points array is added as attribute array_unsplit_points to this grid object
masked (boolean, default False) – if True, a masked array is returned with NaN points masked out; if False, a simple (unmasked) numpy array is returned
- Returns
numpy array of float of shape (nk + k_gaps + 1, nj + 1, ni + 1, 3)
Note
for grids without split pillars, this function simply returns the points array in its native form; for grids with split pillars, an unsplit equivalent points array is calculated as the average of contributions to each pillar from the surrounding cell columns
- unsplit_x_section_points(axis, ref_slice0=0, plus_face=False, masked=False)[source]¶
Returns a 2D (+1 for xyz) array of points representing cell corners from an I or J interface slice.
- Parameters
axis (string) – ‘I’ or ‘J’ being the axis of the cross-sectional slice (ie. dimension being dropped)
ref_slice0 (int, default 0) – the reference value for indices in I or J (as defined in axis)
plus_face (boolean, default False) – if False, negative face is used; if True, positive
masked (boolean, default False) – if True, a masked numpy array is returned with NaN values masked out
- Returns
a 2+1D numpy array being the xyz points of the cell corners on the interfacial cross section; the 2D axes are K,J or K,I - whichever does not involve axis; shape is (nk + 1, nj + 1, 3) or (nk + 1, ni + 1, 3)
Note
restricted to unsplit grids with no k gaps; use split_x_section_points() for split grids with no k gaps or split_gap_x_section_points() for split grids with k gaps or x_section_corner_points() for any grid
- volume(cell_kji0=None, points_root=None, cache_resqml_array=True, cache_cp_array=False, cache_centre_array=False, cache_volume_array=True, property_collection=None, required_uom=None)[source]¶
Returns bulk rock volume of cell or numpy array of bulk rock volumes for all cells.
- Parameters
cell_kji0 (optional) – if present, the (k, j, i) indices of the individual cell for which the volume is required; zero based indexing
cache_resqml_array (boolean, default True) – If True, the raw points array from the hdf5 file is cached in memory, but only if it is needed to generate the volume
cache_cp_array (boolean, default False) – If True, an array of corner points is generated and added as an attribute of the grid, with attribute name corner_points, but only if it is needed in order to generate the volume
cache_volume_array (boolean, default False) – if True, volumes are generated for all cells in the grid and added as an attribute named array_volume
(property (property_collection) – GridPropertyCollection, optional): If not None, this collection is probed for a suitable volume property which is used preferentially to calculating volume; if no suitable property is found, the calculation is made as if the collection were None
required_uom (str, optional) – if present, the RESQML unit of measure (for quantity volume) that the volumes will be returned (and cached) in; if None, the grid’s CRS z units cubed will be used
- Returns
float, being the volume of cell identified by cell_kji0; or numpy float array of shape (nk, nj, ni) if cell_kji0 is None
Notes
the function can be used to find the volume of a single cell, or cache volumes for all cells, or both; if property_collection is not None, a suitable volume property will be used if present; if calculated, volume is computed using 6 tetras each with a non-planar bilinear base face;
- write_hdf5(expand_const_arrays=False)[source]¶
Writes grid geometry arrays to hdf5 (thin wrapper around write_hdf5_from_caches().
- write_hdf5_from_caches(file=None, mode='a', geometry=True, imported_properties=None, write_active=None, stratigraphy=True, expand_const_arrays=False)[source]¶
Create or append to an hdf5 file.
Writes datasets for the grid geometry (and parent grid mapping) and properties from cached arrays.
- write_nexus_corp(file_name, local_coords=False, global_xy_units=None, global_z_units=None, global_z_increasing_downward=True, nexus_unit_system=None, write_nx_ny_nz=False, write_units_keyword=False, write_rh_keyword_if_needed=False, write_corp_keyword=False, use_binary=False, binary_only=False, nan_substitute_value=None)[source]¶
Write grid geometry to file in Nexus CORP ordering.
- Parameters
file_name (str) – the path of the file to generate
local_coords (bool, default False) – if True, CORP data is written in local coordinates
global_xy_units (str, optional) – RESQML length uom to use for global xy coords; required if local_coords is False
global_z_units (str, optional) – RESQML length uom to use for global z coords; required if local_coords is False
global_z_increasing_downward (bool, default True) – whether global z values increase downwards; ignored if local_coords is True
nexus_unit_system (str, optional) – the target Nexus unit system for the CORP data; if present, one of: ‘METRIC’, ‘METBAR’, ‘METKG/CM2’, ‘LAB’ or ‘ENGLISH’; if None, will be guessed based on local or global z units
write_nx_ny_nz (bool, default False) – if True, NX NY NZ keywords and values are written
write_units_keyword (bool, default False) – if True, the Nexus unit system keyword is written
write_rh_keyword_if_needed (bool, default False) – if True, the RIGHTHANDED keyword is written if needed based on xyz and IJK handedness
write_corp_keyword (bool, default False) – if True, the CORP keyword is written before the values
use_binary (bool, default False) – if True, a pure binary file with the corp array is written
binary_only (bool, default False) – if True, no ascii file is created, only a pure binary file
nan_substitute_value (float, optional) – if present, a value to use in place of NaNs
- x_section_corner_points(axis, ref_slice0=0, plus_face=False, masked=False, rotate=False, azimuth=None)[source]¶
Returns a fully expanded array of points representing cell corners from an I or J interface slice.
- Parameters
axis (string) – ‘I’ or ‘J’ being the axis of the cross-sectional slice (ie. dimension being dropped)
ref_slice0 (int, default 0) – the reference value for indices in I or J (as defined in axis)
plus_face (boolean, default False) – if False, negative face is used; if True, positive
masked (boolean, default False) – if True, a masked numpy array is returned with NaN values masked out
rotate (boolean, default False) – if True, the cross section points are rotated around the z axis so that an azimuthal direction is mapped onto the positive x axis
aximuth (float, optional) – the compass bearing in degrees to map onto the positive x axis if rotating; if None, the mean direction of the cross sectional points, along axis, is used; ignored if rotate is False
- Returns
a numpy float array of shape (nk, nj, 2, 2, 3) or (nk, ni, 2, 2, 3) being the xyz points of the cell corners on the interfacial cross section; the 3rd index (1st 2) is kp, the 4th index is jp or ip
Note
this method will work for unsplit or split grids, with or without k gaps; use rotate argument to yield points with predominant variation in xz, suitable for plotting cross sections; if rotate is True then the absolute values of x & y will not be very meaningful though the units will still be the grid’s xy units for relative purposes
- x_section_points(axis, ref_slice0=0, plus_face=False, masked=False)[source]¶
Deprecated: please use unsplit_x_section_points instead.
- xy_units()[source]¶
Returns the projected view (x, y) units of measure of the coordinate reference system for the grid.
- xyz_box(points_root=None, lazy=True, local=False)[source]¶
Returns the minimum and maximum xyz for the grid geometry.
- Parameters
points_root (optional) – if not None, the xml root node for the points data (speed optimization)
lazy (boolean, default True) – if True, only the 8 outermost logical corners of the grid are used to determine the ranges of xyz; if False, all the points in the entire grid are scanned to determine the xyz ranges in an exhaustive manner
local (boolean, default False) – if True, the xyz ranges that are returned are in the local coordinate space, otherwise the global (crs parent) coordinate space
- Returns
numpy array of float of shape (2, 3); the first axis is minimum, maximum; the second axis is x, y, z
Note
if the lazy argument is True, the results are likely to under-report the ranges, especially for z
- xyz_box_centre(points_root=None, lazy=False, local=False)[source]¶
Returns the (x,y,z) point (as 3 element numpy) at the centre of the xyz box for the grid.
- Parameters
points_root (optional) – if not None, the xml root node for the points data (speed optimization)
lazy (boolean, default True) – if True, only the 8 outermost logical corners of the grid are used to determine the ranges of xyz and hence the centre; if False, all the points in the entire grid are scanned to determine the xyz ranges in an exhaustive manner
local (boolean, default False) – if True, the xyz values that are returned are in the local coordinate space, otherwise the global (crs parent) coordinate space
- Returns
numpy array of float of shape (3,) being the x, y, z coordinates of the centre of the grid
Note
the centre point returned is simply the midpoint of the x, y & z ranges of the grid
- z_corner_point_depths(order='cellular')[source]¶
Returns the z (depth) values of each corner of each cell.
- Parameters
order (string, default 'cellular') – either ‘cellular’ or ‘linear’; if ‘cellular’ the resulting array has shape (nk, nj, ni, 2, 2, 2); if ‘linear’, the shape is (nk, 2, nj, 2, ni, 2)
- Returns
numpy array of shape (nk, nj, ni, 2, 2, 2) or (nk, 2, nj, 2, ni, 2); for the cellular ordering, the result can be indexed with [k, j, i, kp, jp, ip] (where kp, for example, is 0 for the K- face and 1 for K+); for the linear ordering, the equivalent indexing is [k, kp, j, jp, i, ip], as used by some common simulator keyword formats
- z_inc_down()[source]¶
Return True if z increases downwards in the coordinate reference system used by the grid geometry
- z_units()[source]¶
Returns the vertical (z) units of measure of the coordinate reference system for the grid.
- title¶
Citation title
- originator¶
Creator of object. By default, user id.
- uuid¶
Unique identifier