Terrestrial images
Between 1915 and 1947 much of the region of the Alps was topographically surveyed using terrestrial photogrammetry for the purpose of producing the 1:10'000 fortification maps and the 1:50'000 National Map.

Federal Office of Topography swisstopo
Infodesk history
Seftigenstrasse 264
3084 Wabern
Seftigenstrasse 264
3084 Wabern