pyart.io.read_grid_mdv#

pyart.io.read_grid_mdv(filename, field_names=None, additional_metadata=None, file_field_names=False, exclude_fields=None, delay_field_loading=False, **kwargs)[source]#

Read a MDV file to a Grid Object.

Parameters:

  • filename (str) – Name of MDV file to read or file-like object pointing to the beginning of such a file.

  • field_names (dict, optional) – Dictionary mapping MDV data type names to radar field names. If a data type found in the file does not appear in this dictionary or has a value of None it will not be placed in the radar.fields dictionary. A value of None, the default, will use the mapping defined in the Py-ART configuration file.

  • additional_metadata (dict of dicts, optional) – Dictionary of dictionaries to retrieve metadata from during this read. This metadata is not used during any successive file reads unless explicitly included. A value of None, the default, will not introduct any addition metadata and the file specific or default metadata as specified by the Py-ART configuration file will be used.

  • file_field_names (bool, optional) – True to use the MDV data type names for the field names. If this case the field_names parameter is ignored. The field dictionary will likely only have a ‘data’ key, unless the fields are defined in additional_metadata.

  • exclude_fields (list or None, optional) – List of fields to exclude from the grid object. This is applied after the file_field_names and field_names parameters.

  • delay_field_loading (bool) – True to delay loading of field data from the file until the ‘data’ key in a particular field dictionary is accessed. In this case the field attribute of the returned Radar object will contain LazyLoadDict objects not dict objects.

Returns:

grid (Grid) – Grid object containing data from MDV file.

Notes

This function can only read cartesian MDV files with fields compressed with gzip or zlib. For polar files see pyart.io.read_mdv()

MDV files and Grid object are not fully interchangeable. Specific limitation include:

  • All fields must have the same shape and dimensions.

  • All fields must have the same projection.

  • Vlevels types must not vary.

  • Projection must not be PROJ_POLAR_RADAR (9) or PROJ_RHI_RADAR (13).

  • Correct unit in the Z axis are just availible for ‘vlevel_type’ equal to VERT_TYPE_Z(4), VERT_TYPE_ELEV(9), VERT_TYPE_AZ(17), VERT_TYPE_PRESSURE(3) and VERT_TYPE_THETA(7).

  • The behavior in cases of 2D data is unknown but most likely will not fail.