=== OpenStreetMap ===

bonn_boundary_osm_epsg4647.gpkg: OpenStreetMap is open data, licensed under the Open Data Commons Open Database License (ODbL) by the OpenStreetMap Foundation (OSMF). 

Extracted with http://overpass-turbo.eu/

=== openNRW ===

dgm1_bonn_epsg4647.tif: Datenlizenz Deutschland Namensnennung 2.0
                        https://www.govdata.de/dl-de/by-2-0

Source: https://open.nrw/dataset/a0bee703-82db-4cf8-8001-f8d76bc4b115bkg

Converted with:
 https://github.com/mundialis/openNRW/tree/master/dgm