uxarray.Grid

class uxarray.Grid(grid_ds, source_grid_spec=None, source_dims_dict={})

Represents a two-dimensional unstructured grid encoded following the UGRID conventions and provides grid-specific functionality.

Can be used standalone to work with unstructured grids, or can be paired with either a ux.UxDataArray or ux.UxDataset and accessed through the .uxgrid attribute.

For constructing a grid from non-UGRID datasets or other types of supported data, see our ux.open_grid method or specific class methods (Grid.from_dataset, Grid.from_face_verticies, etc.)

Parameters:

• grid_ds (xr.Dataset) – xarray.Dataset encoded in the UGRID conventions

• source_grid_spec (str, default="UGRID") – Original unstructured grid format (i.e. UGRID, MPAS, etc.)

• source_dims_dict (dict, default={}) – Mapping of dimensions from the source dataset to their UGRID equivalent (i.e. {nCell : n_face})

Examples

>>> import uxarray as ux
>>> grid_path = "/path/to/grid.nc"
>>> data_path = "/path/to/data.nc"

1. Open a grid file with uxarray.open_grid():

>>> uxgrid = ux.open_grid(grid_path)

2. Open an unstructured grid dataset file with uxarray.open_dataset(), then access the Grid.:

>>> uxds = ux.open_dataset(grid_path, data_path)
>>> uxds.uxgrid

__init__(grid_ds, source_grid_spec=None, source_dims_dict={})

Methods

__init__(grid_ds[, source_grid_spec, ...])
calculate_total_face_area([quadrature_rule, ...])	Function to calculate the total surface area of all the faces in a mesh.
compute_face_areas([quadrature_rule, order, ...])	Face areas calculation function for grid class, calculates area of all faces in the grid.
copy()	Returns a deep copy of this grid.
encode_as(grid_type)	Encodes the grid as a new xarray.Dataset per grid format supplied in the grid_type argument.
from_dataset(dataset[, use_dual])	Constructs a Grid object from an xarray.Dataset.
from_face_vertices(face_vertices[, latlon])	Constructs a Grid object from user-defined face vertices.
get_ball_tree([coordinates, ...])	Get the BallTree data structure of this Grid that allows for nearest neighbor queries (k nearest or within some radius) on either the (node_x, node_y, node_z) and (node_lon, node_lat), edge (edge_x, edge_y, edge_z) and (edge_lon, edge_lat), or center (face_x, face_y, face_z) and (face_lon, ` face_lat`) nodes.
get_kd_tree([coordinates, ...])	Get the KDTree data structure of this Grid that allows for nearest neighbor queries (k nearest or within some radius) on either the (node_x, node_y, node_z) and (node_lon, node_lat), edge (edge_x, edge_y, edge_z) and (edge_lon, edge_lat), or center (face_x, face_y, face_z) and (face_lon, face_lat) nodes.
isel(**dim_kwargs)	Indexes an unstructured grid along a given dimension (n_node, n_edge, or n_face) and returns a new grid.
to_geodataframe([override, cache, ...])	Constructs a spatialpandas.GeoDataFrame with a "geometry" column, containing a collection of Shapely Polygons or MultiPolygons representing the geometry of the unstructured grid.
to_linecollection([override, cache])	Constructs a matplotlib.collections.LineCollection object with line segments representing the geometry of the unstructured grid, corrected near the antimeridian.
to_polycollection([override, cache, ...])	Constructs a matplotlib.collections.PolyCollection object with polygons representing the geometry of the unstructured grid, with polygons that cross the antimeridian split.
validate()	Validate a grid object check for common errors, such as:

Attributes

Mesh2	UGRID Attribute Mesh2, which indicates the topology data of a 2D unstructured mesh.
antimeridian_face_indices	Index of each face that crosses the antimeridian.
edge_edge_connectivity	Connectivity Variable edge_edge_connectivity.
edge_face_connectivity	Connectivity Variable edge_face_connectivity, which contains the index of the faces that saddle a given edge.
edge_face_distances	Contains the distance between the faces that saddle a given edge.
edge_lat	Coordinate edge_lat, which contains the latitude of each edge in degrees.
edge_lon	Coordinate edge_lon, which contains the longitude of each edge in degrees.
edge_node_connectivity	Connectivity Variable edge_node_connectivity, which maps every edge to the two nodes that it connects.
edge_node_distances	Contains the distance between the nodes that saddle a given edge.
edge_x	Coordinate edge_x, which contains the Cartesian x location of each edge in meters.
edge_y	Coordinate edge_y, which contains the Cartesian y location of each edge in meters.
edge_z	Coordinate edge_z, which contains the Cartesian z location of each edge in meters.
face_areas	Declare face_areas as a property.
face_edge_connectivity	Connectivity Variable face_edge_connectivity, which maps every face to its edges.
face_face_connectivity	Connectivity Variable face_face_connectivity.
face_jacobian	Declare face_jacobian as a property.
face_lat	Coordinate face_lat, which contains the latitude of each face in degrees.
face_lon	Coordinate face_lon, which contains the longitude of each face in degrees.
face_node_connectivity	Connectivity Variable face_node_connectivity, which maps each face to its corner nodes.
face_x	Coordinate face_x, which contains the Cartesian x location of each face in meters.
face_y	Coordinate face_y, which contains the Cartesian y location of each face in meters.
face_z	Coordinate face_z, which contains the Cartesian z location of each face in meters.
n_edge	Dimension n_edge, which represents the total number of unique edges.
n_face	Dimension n_face, which represents the total number of unique faces.
n_max_face_edges	Dimension n_max_face_edges, which represents the maximum number of edges per face.
n_max_face_nodes	Dimension n_max_face_nodes, which represents the maximum number of nodes that a face may contain.
n_node	Dimension n_node, which represents the total number of unique corner nodes.
n_nodes_per_face	Dimension Variable n_nodes_per_face, which contains the number of non-fill-value nodes per face.
node_edge_connectivity	Connectivity Variable node_edge_connectivity.
node_face_connectivity	Connectivity Variable node_face_connectivity, which maps every node to its faces.
node_lat	Coordinate node_lat, which contains the latitude of each node in degrees.
node_lon	Coordinate node_lon, which contains the longitude of each node in degrees.
node_node_connectivity	Connectivity Variable node_node_connectivity.
node_x	Coordinate node_x, which contains the Cartesian x location of each node in meters.
node_y	Coordinate node_y, which contains the Cartesian y location of each node in meters.
node_z	Coordinate node_z, which contains the Cartesian y location of each node in meters.
parsed_attrs	Dictionary of parsed attributes from the source grid.