If you have a question for which you can’t find an answer here, or if have suggestions for missing features, you can contact us.
With its introduction, the KNMI Data Platform (KDP) will be more primitive and sober than the KNMI Data Center (KDC): it functions as a foundation on which we will continue to build.
Will those dropped functionalities return to the new platform? This depends on you. Our goal is to develop functionalities that are/remain used in the future.
No, you are no longer able to use FTP. After the migration from KDC to KDP, the way you download data has changed. FTP and HTTP downloads have been replaced by API downloads.
The Get Started section provides you with the required information to access Open Data.
In KDP context, files with the
.nc extension refer to NetCDF files.
NetCDF is a data format that supports the creation, access, and sharing of array-oriented scientific data.
There are different libraries in different programming languages that can be used to load and manipulate NetCDF files. Documentation of these libraries describes how the library can be used in combination with NetCDF files.
If you request an API key, you receive a confirmation email with details for that specific API key. First, try to find this specific email in your email account. It can happen that these e-mails end up in your spam folder. Therefore, make sure your spam folder does not contain this confirmation email. If you cannot find the email containing the API key, please contact us to revoke your API key. You can request a new API key after the old one has been revoked.
You will get back an error response with HTTP code 429.
In most cases, developers want higher quotas or rate limits because they want to download a (partially) complete dataset. If this is the case, you can take a look at the Complete Dataset Download section.
There might be some latency due to updating between your API calls and your API usage.
Anonymous keys are subject to an expiry date. Read the Get Started section for more information, and to view the latest active keys.
If your personal API key does not work, please contact us.
All datasets in this portal are free of charge and are provided under the ‘OpenData’ policy of the Dutch government. For more information on the ‘OpenData’ policy, visit the data portal of the Dutch government.
To ensure fair usage and to be able to scale operation costs of the KDP, we limit the total number of requests you can make with an API key in a period. Unregistered users that make use of anonymous API keys share these limits among all other active users of that key. To qualify for individual limits, you can register with your personal email address. The limits that apply to your personal API key usage should be suitable for most operational use cases. If you want to download a complete dataset within a reasonable time, take a look at the Complete Dataset Download section.
When you register yourself in this portal, you make use of your personal email address. Your email address is considered personal data. Personal data is information that can be used to identify you, like a name, a home address, or an email address. The protection of personal data is codified in law (‘Wet bescherming persoonsgegevens, Wbp’). This law helps to guard the privacy of citizens and is also applicable for personal data collected via the internet.
Under this law, personal data can only be used if it is explicitly stated in the user agreement. It must be clear for what purpose the personal information is stored. KDP uses your email address only for user registration and provision of access rights to datasets (authentication and authorization purposes). The law does provide some exceptions. Personal data can be used for criminal investigations if someone uses the site for committing acts or making statements that are punishable by law.
If you view the documentation of the Open Data API in the API Catalogue, you can see that the endpoint for listing the
dataset files support the
startAfterFilename query parameter.
This query parameter can be used to retrieve all files after a specific filename.
It makes use of UTF-8 binary order for filename comparison.
If we list the files for the dataset
radar_forecast/1.0 without specifying
startAfterFilename, we retrieve a list of
objects with the following filenames:
RAD_NL25_PCP_FM_201910261400.h5, RAD_NL25_PCP_FM_201910261405.h5, RAD_NL25_PCP_FM_201910261410.h5, ...
To retrieve the first files on date 2020-01-01, we pass the last valid dataset filename of the previous day as a value
In this example, this will be the file with the name
Note that the filename consists of the date, 2019-12-31, and the time, 23:55.
As a suffix, this becomes the value 201912312355.
If we call the endpoint for listing dataset files again with
RAD_NL25_PCP_FM_201912312355.h5 as value for the query
startAfterFilename, we retrieve a different list of objects with the following filenames:
RAD_NL25_PCP_FM_202001010000.h5, RAD_NL25_PCP_FM_202001010005.h5, RAD_NL25_PCP_FM_202001010010.h5, ...
Now we retrieve the datasets file “after” the given filename.
The documentation of the Open Data API explains in more detail how comparison of the value
with existing dataset filenames works.
X-KNMI-Deprecationin my response mean?
As with any software, features naturally evolve over time. Sometimes a new version for a feature will be substantially different, causing the old version of that feature to be deprecated. This key notifies the end of this feature, API version, or dataset. This key is only present when the feature is announced for deprecation. More information can be found here