Published on 28 October 2022

Photograms – an Ever-Growing Treasure

For over 100 years, swisstopo has been surveying Switzerland with the help of photographs. During the surveying work on the ground and from the air, new images of the landscape have continuously been produced in addition to measurement data. Originally, the images were mainly used to produce maps. However, over the decades, a historical treasure has been unintentionally created. Today, it opens up new doors for research.