This chapter of webWuerselen focuses on maps of the city of Würselen indicating some interessting information.
The maps are static and provide data based on the status April 2017. They are not expected to be updated. The maps are compiled using the Geoportal NRW.
Since 1.1.2017 you are free to use the data provided that you follow the rules under the goverment license (http://www.govdata.de/dl-de/by-2-0). This means, you must provide the source and link to the license. Therefore, all maps are subcripted with the necessary source data.
If you want to have a more detailled look into the available data don't hesitate to surf to the Geoportal. It is pure German. However, be sure that even a native speaker have to use the method of trial and error to get what he/she wants.