#Biketooter :When planning a #bike #route with #FOSS and #OSM based #routing engines, such as #Brouter / #Bikerouter ,the result analysis frequently shows some #surface percentage as "unknown". I guess that's because the #information is missing in the #OpenstreetMap #database .However, when I upload the same track as #GPX into a #commercial #biking application, such as #Komoot or #Cyclers ,the "unknown" has disappeared, while they are also based on OSM. How come?