harmonica.datasets.fetch_gravity_earth¶

harmonica.datasets.fetch_gravity_earth()[source]¶

Fetch a global grid of Earth gravity.

Gravity is the magnitude of the gravity vector of the Earth (gravitational + centrifugal). The gravity observations are at 10 km (geometric) height and on a regular grid with 0.5 degree spacing. The grid was generated from the spherical harmonic model EIGEN-6C4 [Forste_etal2014] using the ICGEM Calculation Service. See the attrs attribute of the xarray.Dataset for information regarding the grid generation.

If the file isn’t already in your data directory, it will be downloaded automatically.

Returns: grid (xarray.Dataset) – The gravity grid (in mGal). Includes a computation (geometric) height grid (height_over_ell). Coordinates are geodetic latitude and longitude.