NWP Downloading Utilities

Contains utilities for downloading (relevant parts) of NWP products.

Currently focussing on MetNo.

Product	Remote Access (OPeNDAP)	Local Access (NetCDF4)	Comment
MEPS	Yes	No
MyWaveWAM	Yes	Yes	Broken
NorKyst800m	Yes	No

The package is pre-Alpha software. It does what we need it to do and not much more.

Development

We'll assume you're using Miniforge.

Setting up a development space

conda create --name nwpdl-dev
conda activate nwpdl-dev
mamba install numpy xarray pandas pytest pyresample netCDF4 dask
conda deactivate nwpdl-dev
conda activate nwpdl-dev

To run the tests, simply run pytest in the base directory.

Development Mode

You can use development mode to make the current version of the code available to other packages. To proceed, enter the virtual environment of whatever program you're working on, navigate to the ./nwp_dl_utils root directory, remove the existing installation of nwp-dl-utils (if it exists), and install it in development mode, viz.

pip uninstall nwp-dl-utils
pip install --editable .

When done, remove, and reinstall the version from PyPI, viz.

pip uninstall nwl-dl-utils
pip install --ugrade nwp-dl-utils

This needs pip>=21.3, see here and here. You can upgrade Pip via pip install --upgrade pip.

Build and Distribute

Setup environment

conda create --name nwpdl-build
conda activate nwpdl-build
pip install --upgrade pip
pip install --upgrade build
pip install --upgrade twine

Build and upload

python -m build
python -m twine upload --repository testpypi dist/* 

Drop --repository testpypi to upload to real PyPI.

Test build

conda create --name nwpdl-test
conda activate nwpdl-test
pip install --index-url https://test.pypi.org/simple/ --no-deps nwp-dl-utils

Drop --index-url https://test.pypi.org/simple/ --no-deps to download from real PyPI.

References

1. https://packaging.python.org/en/latest/tutorials/packaging-projects/.
2. https://setuptools.pypa.io/en/latest/userguide/development_mode.html

Blame and Contact

• Volker Hoffmann (volker.hoffmann@sintef.no)