weewx-DWD starts supporting KNMI

[Karen K]

weewx-DWD starts supporting the dutch weather service KNMI. See KNMI wiki page for more details. 

KNMI uses a sophisticated interface that involves several steps to retrieve one file. You cannot simply download it from their web server. weewx-DWD supports this interface now, but I guess, there is still some work to do left.

[Karen K]

There was the question how to put the country borders and the coast line below the radar data in the example. I asked the KNMI for that, and they replied immediately. So I updated the wiki page with HTML code and an example picture.

https://github.com/roe-dl/weewx-DWD/wiki/Koninklijk-Nederlands-Meteorologisch-Instituut-(KNMI)#knmi-ogc-server