l3py is a free Open Source software package for computing gridded mass anomalies (Level 3 products) from time variable gravity field solutions. It is tailored for products of the GRACE mission and its successor GRACE-FO.

The features of l3py are:

• File I/O for common data formats including GFC files and COARDS compliant netCDF
• Basic arithmetic operations for sets of potential coefficients
• Propagation of spherical harmonic coefficients to gridded mass anomalies
• Spatial filtering of potential coefficients

l3py is written for Python>=3.4 and only depends on numpy and netcdf4. The current release is hosted on the PyPI and can be installed through:

pip install l3py

To install the current development version of the package, first clone the repository or download the zip archive. In the root directory of the package (i.e. the directory containing the setup.py file), running

pip install .

will install the package and its dependencies.

A complete API reference of the module is available on readthedocs: https://l3py.readthedocs.io/en/latest.

l3py a free Open Source software released under the MIT license.

If you wish to cite l3py in a publication, please use the following DOI.