pyresample package

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Module contents

Pyresample package for geographic data resampling and related utilities.

pyresample.convert_def_to_yaml(def_area_file, yaml_area_file)

Convert a legacy area def file to the yaml counter partself.

yaml_area_file will be overwritten by the operation.

pyresample.create_area_def(area_id, projection, width=None, height=None, area_extent=None, shape=None, upper_left_extent=None, center=None, resolution=None, radius=None, units=None, optimize_projection=False, **kwargs)

Create AreaDefinition from whatever information is known.

Parameters:

  • area_id (str) – ID of area

  • projection (pyproj CRS object, dict, str, int, tuple, object) – Projection parameters. This can be in any format understood by pyproj.crs.CRS.from_user_input(), such as a pyproj CRS object, proj4 dict, proj4 string, EPSG integer code, or others.

  • description (str, optional) – Description/name of area. Defaults to area_id

  • proj_id (str, optional) – ID of projection (deprecated)

  • units (str, optional) –

    Units that provided arguments should be interpreted as. This can be one of ‘deg’, ‘degrees’, ‘meters’, ‘metres’, and any parameter supported by the cs2cs -lu command. Units are determined in the following priority:

    1. units expressed with each variable through a DataArray’s attrs attribute.

    2. units passed to units

    3. units used in projection

    4. meters

  • width (str, optional) – Number of pixels in the x direction

  • height (str, optional) – Number of pixels in the y direction

  • area_extent (list, optional) – Area extent as a list (lower_left_x, lower_left_y, upper_right_x, upper_right_y)

  • shape (list, optional) – Number of pixels in the y and x direction (height, width)

  • upper_left_extent (list, optional) – Upper left corner of upper left pixel (x, y)

  • center (list, optional) – Center of projection (x, y)

  • resolution (list or float, optional) – Size of pixels: (dx, dy)

  • radius (list or float, optional) – Length from the center to the edges of the projection (dx, dy)

  • nprocs (int, optional) – Number of processor cores to be used

  • lons (numpy array, optional) – Grid lons

  • lats (numpy array, optional) – Grid lats

  • optimize_projection – Whether the projection parameters have to be optimized for a DynamicAreaDefinition.

Returns:

area – If shape and area_extent are found, an AreaDefinition object is returned. If only shape or area_extent can be found, a DynamicAreaDefinition object is returned

Return type:

pyresample.geometry.AreaDefinition or pyresample.geometry.DynamicAreaDefinition

Raises:

ValueError: – If neither shape nor area_extent could be found

Notes

  • resolution and radius can be specified with one value if dx == dy

  • If resolution and radius are provided as angles, center must be given or findable. In such a case, they represent [projection x distance from center[0] to center[0]+dx, projection y distance from center[1] to center[1]+dy]

pyresample.get_area_def(area_id, area_name, proj_id, proj4_args, width, height, area_extent)

Construct AreaDefinition object from arguments.

Parameters:

  • area_id (str) – ID of area

  • area_name (str) – Description of area

  • proj_id (str) – ID of projection

  • proj4_args (dict, CRS, or str) – Projection information passed to pyproj’s CRS object

  • width (int) – Number of pixel in x dimension

  • height (int) – Number of pixel in y dimension

  • area_extent (list | tuple) – Area extent as a list of ints (LL_x, LL_y, UR_x, UR_y)

Returns:

area_def – AreaDefinition object

Return type:

object

pyresample.load_area(area_file_name, *regions)

Load area(s) from area file.

Parameters:

  • area_file_name (str, pathlib.Path, stream, or list thereof) – List of paths or streams. Any str or pathlib.Path will be interpreted as a path to a file. Any stream will be interpreted as containing a yaml definition file. To read directly from a string, use load_area_from_string().

  • regions (str argument list) – Regions to parse. If no regions are specified all regions in the file are returned

Returns:

area_defs – If one area name is specified a single AreaDefinition object is returned. If several area names are specified a list of AreaDefinition objects is returned

Return type:

pyresample.geometry.AreaDefinition or list

Raises:

AreaNotFound: – If a specified area name is not found

pyresample.parse_area_file(area_file_name, *regions)

Parse area information from area file.

Parameters:

  • area_file_name (str or list) – One or more paths to area definition files

  • regions (str argument list) – Regions to parse. If no regions are specified all regions in the file are returned

Returns:

area_defs – List of AreaDefinition objects

Return type:

list

Raises:

AreaNotFound: – If a specified area is not found