GeoModels

Copyright:	2019-2025 Antonio Valentino
license:	MIT
url:	https://github.com/avalentino/geomodels

About

GeoModels provides tools for the management of Earth models like geoids, gravity models, and magnetic field models.

It also provides some utility function to download and install support data to that are necessary for Earth models computation.

It is basically a Cython wrapper for part of the the GeographicLib C++ library.

Installation

The GeoModels requires Python >= 3.10. To use GeoModels depends on the following Python packages:

numpy
tqdm (optional)
argcomplete (optional)

The required Python packages are automatically installed installed by Pip and setuptools:

$ python3 -m pip install geomodels

Please refer to the Pip user manual for details about installation options and to the :doc:`installation` section in the documentation for details about installation from sources.

Model data installation

GeoModels uses external data to perform geoid, gravity and magnetic field computations.

If required data are not already available on the system than they can be downloaded and installed using the command line interface provided by the GeoModels package:

$ python3 -m geomodels install-data [-d DATADIR] recommended

The above command installs the recommended subset of data (about 20MB) into the specified DATAROOT`folder. If `DATAROOT is not explicitly specified using the -d (or --datadir) option then the default system path is used (e.g. /usr/local/share/GeographicLib).

In any case it is necessary to have write permission on the DATADIR folder, so to install into the default system path it will be probably necessary to use sudo or some equivalent method.

If data are not installed into the default system folder than it is necessary to set the GEOGRAPHICLIB_DATA environment variable to the data installation path to allow GeographicLib to find data. E.g., on systems using bash one can use the following command:

export GEOGRAPHICLIB_DATA=/path/to/data

Testing

Once the GeoModels package and necessary data have been installed, it is possible to run the test suite to be sure that all works correctly. The recommended way to test GeoModels with using PyTest:

$ env GEOGRAPHICLIB_DATA=/path/to/data \
  python3 -m pytest --pyargs geomodels

Usage example

>>> from geomodels import GeoidModel
>>> geoid = GeoidModel()
>>> geoid.description()
'WGS84 EGM96, 5-minute grid'
>>> geoid(lat=40.667, lon=16.6)  # -> geoid height
45.914894760480024

License

GeoModels is released under the terms of the MIT/X11 License (see LICENSE file).

License

avalentino/geomodels

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