ZarrDAP

OPeNDAP for Zarr!

ZarrDAP is a FastAPI project that provides access to Zarr and NetCDF data in remote object storage using the Open-source Project for a Network Data Access Protocol (OPeNDAP).

Table of Contents

• Getting Started
• Developing
• Maintainers
• Contributing
• License

Getting Started

To run ZarrDAP directly:

1. Clone this repository: git clone <URL>
2. Create a Python virtual environment: python3 -m venv .venv
3. Activate the virtual environment: source .venv/bin/activate (Linux) or .venv\Scripts\activate.bat (Windows)
4. Install required libraries: pip install -r requirements.txt
5. Start the server: gunicorn -k uvicorn.workers.UvicornH1Worker app.zarrdap:app -b 0.0.0.0:8000

To run ZarrDAP in Docker:

1. Clone this repository: git clone <URL>
2. Modify the Dockerfile with any additional parameters
3. Create a Docker image: docker build -t zarrdap .
4. Start a Docker container: docker run -d -p 80:8000 zarrdap

Developing

ZarrDAP is composed of a frontend UI and four APIs. The APIs are documented at the /zarrdap/docs endpoint.

Catalog

/zarrdap/catalog /zarrdap/api/catalog

An HTML catalog provides a discovery UI for datasets in S3. HTML templates are developed in app/templates, and the routing is defined in app/routes/views.py.

A Search API returns a list of datasets that match keyword or filetype parameters. The API is developed in app/api_catalog/catalog.py.

OPeNDAP

/zarrdap/api/dap2

DAP2-compliant DAS, DDS, and DODS URLs are available for OPeNDAP connectivity. Use the DAP URL with your favorite OPeNDAP client to get started. DAP2 calculations are performed in app/api_dap2/backend.py and routing in app/api_dap2/dap2.py.

NetCDF Subsetting

/zarrdap/api/ncss

Retrieve subsets of data files in NetCDF or CSV format . Subsetting calculations are performed in app/api_dap2/backend.py and routing in app/api_dap2/ncss.py.

Intake

/zarrdap/api/intake

An Intake catalog is automatically generated from the ZarrDAP catalog.

Maintainers

Mark Capece

• mark@markcapece.net
• @markccapece

Contributing

All contributors are welcome. Just open an issue or submit a pull request!

License

Software code created by U.S. Government employees is not subject to copyright in the United States (17 U.S.C. §105).

The United States/Department of Commerce reserve all rights to seek and obtain copyright protection in countries other than the United States for Software authored in its entirety by the Department of Commerce. To this end, the Department of Commerce hereby grants to Recipient a royalty-free, nonexclusive license to use, copy, and create derivative works of the Software outside of the United States.