grates is a free Open Source software package for analyzing time variable gravity field solutions. It is tailored for data sets of the GRACE and GRACE-FO missions.

The features of grates are:

• File I/O for common data formats (GFC files, GRACE-FO SDS Technical Notes, SINEX)
• Basic arithmetic operations for sets of potential coefficients
• Spatial filtering of gravity field solutions
• Meridional transport from ocean bottom pressure fields
• Kalman smoother for the determination of short-term gravity field variations
• Isotropic and anisotropic harmonic kernels

grates is currently in early development with frequent interface changes.

The recommended way to install grates is in a conda environment:

conda create -n grates_env
conda activate grates_env

Then, install all dependencies:

conda install numpy scipy cartopy netcdf4 numpydoc sphinx pyyaml h5py

Alternatively, you can use the environment.yml to create an environment and install all dependencies:

conda env create -f environment.yml

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

python -m pip install .

will install the package. If you want to modify or extend the package, you can install it in develop mode by running

python -m pip install -e .

instead.

grates a free Open Source software released under the GPL v3 license. See License for details.