polartoolkit.fetch.bedmap3

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polartoolkit.fetch.bedmap3#

bedmap3(layer, reference='eigen-gl04c', region=None, spacing=None, registration=None, fill_nans=False, **kwargs)[source]#

Load Bedmap3 data as an xarray.DataArray from Pritchard et al.[1]. accessed from https://ramadda.data.bas.ac.uk/repository/entry/show?entryid=2d0e4791-8e20-46a3-80e4-f5f6716025d2.

All grids are by default referenced to the EIGEN-GL04C geoid. Use the reference=’ellipsoid’ to convert to the WGS-84 ellipsoid or reference=’eigen-6c4’ to convert to the EIGEN-6c4 geoid.

Unlike Bedmachine data, Bedmap2 surface and icethickness contain NaN’s over the ocean, instead of 0’s. To fill these NaN’s with 0’s, set fill_nans=True. Note, this only makes since if the reference is the geoid, therefore, if reference=’ellipsoid and fill_nans=True, the nan’s will be filled before converting the results to the geoid (just for surface, since thickness isn’t relative to anything).

Parameters:

  • layer (str) – choose which layer to fetch: “surface”, “icebase”, “bed”, “ice_thickness”, “water_thickness”, “bed_uncertainty”, “ice_thickness_uncertainty”, and “mask”.

  • reference (str) – choose whether heights are referenced to the ‘eigen-6c4’ geoid, the WGS84 ellipsoid, ‘ellipsoid’, or by default the ‘eigen-gl04c’ geoid.

  • region (tuple[float, float, float, float], optional) – region to clip the loaded grid to, in format [xmin, xmax, ymin, ymax], by default doesn’t clip

  • spacing (str or int, optional) – grid spacing to resample the loaded grid to, by default 500m. If spacing >= 5000m, will resample the grid to 5km, and save it as a preprocessed grid, so future fetch calls are performed faster.

  • registration (str, optional,) – choose between ‘g’ (gridline) or ‘p’ (pixel) registration types, by default is the original type of the grid

  • fill_nans (bool, optional,) – choose whether to fill nans in ‘surface’ and ‘thickness’ with 0. If converting to reference to the geoid, will fill nan’s before conversion, by default is False

  • **kwargs (optional) – additional keyword arguments to pass to the resample_grid function

Returns:

Returns a loaded, and optional clip/resampled grid of Bedmap2.

Return type:

xarray.DataArray

References

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