polartoolkit.fetch.geoid#
- geoid(region=None, spacing=None, registration=None, hemisphere=None, epsg=None, **kwargs)[source]#
Loads a grid of geoid heights derived from the EIGEN-6C4 from Fƶrste et al.[1] spherical harmonic model of Earthās 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], optional) ā region to clip the loaded grid to, in format [xmin, xmax, ymin, ymax], by default doesnāt clip
spacing (str or int, optional) ā grid spacing to resample the loaded grid to, by default 10e3
registration (str, optional) ā change registration with either āpā for pixel or āgā for gridline registration, by default is None.
hemisphere (str, optional) ā choose which hemisphere to retrieve data for, ānorthā or āsouthā, by default None
epsg (str | None) ā choose which region to retrieve data for, either ā3031ā or ā3413ā, by default None
kwargs (Any) ā additional kwargs to pass to resample_grid.
- Returns:
Returns a loaded, and optional clip/resampled grid of geoid height.
- Return type:
References