Welcome to the documentation page about the KNMI Web Mapping Service (WMS) API. This page is meant to get you started with WMS. The API complies with the Open Geospatial Consortium - WMS standard, facilitating integration with WMS clients and geospatial tools and systems.
What is WMS?
Using the geographical webservice Web Mapping Service (WMS) you can request map images. The visualized response to a request is a map image (returned as JPEG, PNG, etc.) and is usually displayed in a browser client application.
Most of the parameters of the map visualisation are controlled by the server, and can’t be changed by a client. If more control over the visualisation is needed, it is also possible to run a WMS server (such as ADAGUC) using the underlying dataset as input. It is also possible to request the numerical data used for a WMS request using a WCS request.
Which datasets are available via WMS?
The datasets available via WMS can be found by searching for the tag “WMS” in the Dataset Catalog.
For some datasets, the temporal coverage available via WMS is limited. This means that only a limited history of a dataset can be accessed via WMS. If you would like to display a longer temporal history, consider hosting your own WMS server.
How to use WMS?
To use WMS, many different clients exist. To list just a few:
How to add a WMS service to OpenGeoWeb
When should I be using an API key with WMS?
For each dataset supporting WMS, there are two WMS URLs available. One for anonymous access, and one with authorization. The anonymous URL can be used directly in any WMS client, but has a shared usage quota and is rate-limited per IP.
If you require more frequent, and reliable access, you should consider using the URL requiring an
API key. You need to supply the API key as the HTTP
Authorization header. Most web clients do
not support adding such a key to the requests. If you still would like to use a web client for
your user, consider proxying these requests in your own backend server infrastructure.
|With API key
|20 requests per second
|1000 requests per hour
|1 request per second (per IP)
|1000 requests per hour (shared)
Requesting an API key
You can request an API key for WMS in the API Catalog. To request an API key, you will need to register for an account. You can do this by clicking the “Register” button in the top right corner of the page. Once registered, you can request an API key by clicking on the appropriate “Request API Key” button on the API Catalog page. You will receive an email with your API key.