The building contours of BAG objects are much more precise than the standard built-up block shapes of the Top10NL topographic data set (aside from the fact that the BAG is more up-to-date than the Top10NL). The “BAG objects & addresses” data set also contains the usage function(s) of buildings. Using the BAG, it’s possible to quickly view locations of shops, entertainment areas, office parks, industrial zones and schools. But these usage functions are not part of a geometry column in the BAG, because a particular BAG residential object can have multiple usage functions (1:n relation). However, using the free Geon BAG convertor it’s possible to create a shapefile of BAG objects that include up to 2 usage functions per BAG residential object.
In QGIS, this point-shapefile may be used to visualise the usage function on top of the building contours. See the example below, using the following legend:
- Green: shops, stores
- Purple: entertainment, restaurants, club houses
- Yellow: education
- Pink: health
- Blue: office
- Brown: industry
- Cyan: sports
- Red: hotels
The topographic map quickly shows the locations of stores, restaurants, office parks, schools, etc. A next step would be to color the entire area of a particular building instead of using a dot. However, this requires some more complex joining of attributes of tables. Anyone with a smart solution is most welcome to report it here.