polartoolkit.fetch.geoid

geoid(region=None, spacing=None, registration=None, hemisphere=None, epsg=None, **kwargs)

Loads a grid of geoid heights derived from the EIGEN-6C4 from Förste et al.[1] spherical harmonic model of Earth’s gravity field. Originally at 10 arc-min resolution. Negative values indicate the geoid is below the ellipsoid surface and vice-versa. To convert a topographic grid which is referenced to the ellipsoid to be referenced to the geoid, add this grid. To convert a topographic grid which is referenced to the geoid to be referenced to the ellipsoid, add this grid.

originally from https://dataservices.gfz-potsdam.de/icgem/showshort.php?id=escidoc:1119897 Accessed via the Fatiando data repository fatiando-data/earth-geoid-10arcmin DOI: 10.5281/zenodo.5882205

Parameters:

• region (tuple[float, float, float, float] | None) – region to clip the loaded grid to, in format [xmin, xmax, ymin, ymax], by default doesn’t clip

• spacing (float | None) – grid spacing to resample the loaded grid to, by default 10e3

• registration (str | None) – change registration with either ‘p’ for pixel or ‘g’ for gridline registration, by default is None.

• hemisphere (str | None) – choose which hemisphere to retrieve data for, “north” or “south”, by default None

• epsg (str | None) – choose which region to retrieve data for, either “3031” or “3413”, by default None

• kwargs (Any) – additional kwargs to pass to resample_grid.

Returns:

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

Return type:

DataArray

References

[1]

Christoph Förste, \relax Sean.L. Bruinsma, Oleg Abrikosov, Jean-Michel Lemoine, Jean Charles Marty, Frank Flechtner, G. Balmino, F. Barthelmes, and R. Biancale. EIGEN-6C4 The latest combined global gravity field model including GOCE data up to degree and order 2190 of GFZ Potsdam and GRGS Toulouse. 2014. doi:10.5880/ICGEM.2015.1.