On Monday, the 23rd of March 2026, we will organise the KNMI Open Data & API workshop. This day, aimed at anyone using or planning to use KNMI data, you can learn about the open data and APIs the Data Platform has to offer. There is also plenty of opportunity to share with us your wishes and desires around KNMI data provisioning and API developments. The day is hands-on and primarily aimed at software developers and researchers using KNMI data.
Program
09.00 Registration and Coffee
09.15 Introduction
09.45 KNMI Data Chains
10.30 Coffee Break
10.45 Workshops Round 1
12.15 Lunch
13.00 Demonstration Use Cases
13.30 Workshops Round 2
15.00 Coffee
15.15 Data Doctors & more
16.15 End of the day
KNMI Data Chains
You can pick one.
| Observations | How are meteorological observations performed at KNMI and which datasets are best suited for your purpose. |
|---|---|
| Radar | KNMI's two precipitation radars in the Netherlands produce many different datasets. Which is best fit for your purpose? |
| HARMONIE | HARMONIE is KNMI's short-range numerical weather forecast model. What does this mean and how can you best make use of it? |
| Warnings | KNMI is responsible for giving timely weather warnings in the Netherlands. Discover which datasets are available. |
Workshops
You can pick two, one for each round.
| Open Data API & Notification Service |
The Open Data API can be used to retrieve files from all our datasets published in the catalog. In this workshop you will learn how to make the API calls. You will learn how to retrieve a single file, a whole dataset, or specific files based on the filtering parameters. We will also touch upon how to use the different file formats that our datasets are stored in. The Notification Service can be used to be automatically notified of updates to the files in our datasets. You will learn how to automatically start the retrieval of a file, when a KNMI dataset has been updated. |
|---|---|
| EDR API | The EDR API allows you to query meteorological observation datasets of specific parameters in a spatio-temporal manner, reducing the need to download entire datasets. In this workshop you will learn how to query the API, from simple to more advanced queries. You will also learn about the CoverageJSON output format, and how to visualise it. |
| WMS Service | The Web Mapping Service (WMS) can be used to visualise datasets such as our precipitation radar directly. Our WMS endpoints can be added to different WMS clients as map layer. In this workshop you will learn how to use Open GeoWeb to access our WMS. |
Data Doctors & more
In the Data Doctors session, you can ask our climate and meteorological experts specific questions about how to use KNMI data to address your meteorological and climate-related inquiries. To enable us to prepare this session, you can already provide a question using the registration form.
Additionally, you can join the discussion on the KNMI Data Platform and its future or provide feedback on the newly released KNMI Data Explorer.
These are the sessions:
| Data Doctors | Ask our climate and meteorological experts specific questions about how to use KNMI data to address your meteorological and climate-related inquiries. To enable us to prepare this session, you can already provide a question using the registration form. |
|---|---|
| Future of KNMI Data Platform | Discover the possibilities of the KNMI Data Platform community and discuss your wishes for the future of KNMI Data Platform. |
| KNMI Data Explorer | Give feedback on the newly released KNMI Data Explorer to view and explore meteorological observations |
Practical information
The day will take place in De Bilt, Utrecht, is free of charge and a lunch will be provided. Workshops will be in English. For participation in a workshop, you will need to bring a laptop.
You can sign up using the button below (required, limited number of seats available).