Aerial photos have been a key component of data collecting and updating at the Danish Geodata Agency since 1945.
Aerial photos of Denmark are taken each year during April and May, when the snow has melted but the trees have not yet foliated. This makes it possible to discern fine details on the resulting photographs.
Since 1975, aerial photos of Denmark have been taken on a 5-year rotating basis. Approximately 1/5 of the country is photographed each spring. Until 1995, all aerial photos of Denmark were taken in black and white. In 1995, the agency began experimenting with colour photos, and since 2001 all aerial photos are taken in colour.
Click here to view the aerial photography rotation schedule since 1958.