EDR-isobaric

What is EDR-isobaric?

EDR-isobaric is an API for isobaric data (temperature and wind in isobaric layers). The API is based on OGC Environmental Data Retrieval (EDR). Data source is GRIB files from https://api.met.no/weatherapi/isobaricgrib/1.0/documentation.

The resulting API is for people who need vertical environmental data for a single location.

The code is written as an example aimed at API developers at Met.no.

Resulting data can be pasted into covjson playground for visualizing:

The area covered by the source:

Who is responsible?

• larsfp at met.no

Status

Feature complete.

Getting started

Test it out

Choose one of the following:

Pull image from Github registry and run with docker

docker pull ghcr.io/metno/edrisobaric:main
docker run -it --rm --publish 5000:5000 ghcr.io/metno/edrisobaric:main --bind_host 0.0.0.0

Build using Pip

This method might need you to install libeccodes-dev from your package manager. Clone repo and run:

python3 -m venv venv
source venv/bin/activate
pip install -r requirements.txt
python3 app/app.py

Web

A test instance is available at https://edrisobaric.k8s.met.no/.

Usage

A grib data file will be downloaded on demand if none is supplied.

Staring the app will give these URLs:

• Landig page: http://127.0.0.1:5000/
• Openapi spec: http://127.0.0.1:5000/api
• SwaggerUI: http://127.0.0.1:5000/docs
• Redoc: http://127.0.0.1:5000/redoc

Example position lookup:

• http://127.0.0.1:5000/collections/isobaric/position?coords=POINT(11.9384%2060.1699)

Arguments supported:

    usage: app.py [-h] [--time TIME] [--file FILE] [--base_url BASE_URL] [--bind_host BIND_HOST] [--api_url API_URL] [--data_path DATA_PATH]

    options:
    -h, --help            show this help message and exit
    --time TIME           Timestamp to fetch data for. Must be in format 2024-01-24T18:00:00Z, where time matches an available production. See
                            <https://api.met.no/weatherapi/isobaricgrib/1.0/available.json?type=grib2> for available files. They are produced every 3rd hour.
                            Example: --datetime="2024-01-24T18:00:00Z"
    --file FILE           Local grib file to read data from. Default will fetch file from API.
    --base_url BASE_URL   Base URL for API, with a trailing slash. Default is http://localhost:5000/
    --bind_host BIND_HOST
                            Which host to bind to. Default is 127.0.0.1. Use 0.0.0.0 when running in container.
    --api_url API_URL     URL to download grib file from. Default is <https://api.met.no/weatherapi/isobaricgrib/1.0/grib2?area=southern_norway>.
    --data_path DATA_PATH
                            Where to store data files. Default is ./data

Use it for production

This is only ment for learning. Use as noted in Testing it out.

Overview of architecture

• C4 diagram

Documentation

• Based on Pydantic EDR- and covjson-libraries by KNMI
• This app will not download new data unless restarted.
• Sample output

Testing

This project is heavily tested to serve as an example for API developers and of sedr.

• This API is tested on commit to internal gitlab
• This API is tested on commit to public github
• To run tests manually, activate your venv, install requirements.txt and requirements-dev.txt, then run tox --parallel. Multiple tests available, see tox -a.

Other APIs for comparison

• https://opendata.fmi.fi/edr/
• https://labs.metoffice.gov.uk/edr/
• https://developer.dataplatform.knmi.nl/edr-api
• https://swim.iblsoft.com/data/icon-de/edr/collections/isobaric/

References and acknowledgements

• Icon from freepik.com
• https://covjson.org/
• https://fastapi.tiangolo.com/tutorial/bigger-applications/

How to contribute

• Issues

Templates

• This document is based on the Met-norway-readme-template.
• Gitlab-ci is based on team-punkt gitlab-ci