You can also explore this data with Google Earth through the master KML file or the individual KML files. Some features are only available from KML files/GoogleEarth. Where available the GPX files contain some of the data as waypoints for downloading into GPS units.
Wenn Du Interesse an Geo-Themen rund um Karlsruhe hast, dann interessiert Dich vielleicht auch die Mailingliste KA-Geo.