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Aerial Photos

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.

Technique
Aerial photos are taken with a 60% overlap along the flight path and a 15% overlap between flight paths. This makes it possible to view the photos stereoscopically, or three-dimensionally. It also improves the accuracy of referencing the photos to latitude and longitude coordinates.

A full set of aerial photos of Denmark at a scale of 1:25,000 numbers more than 6,000 exposures.

Technology
Two types of camera have been used to photograph Denmark from the air. Analogue cameras, which are the older of the two, use traditional film to produce negatives that measure 23 x 23 cm. After the negatives have been printed, they are digitally scanned and georeferenced. Digital cameras, which are newer and more expensive, produce digital data automatically. These also render sharper colour.  Their geographic range, on the other hand, is smaller than that of analogue cameras. The digital techniques are generally more expensive.

Whether analogue or digital, aerial photos have been a key component of data collecting and updating at the National Survey and Cadastre since 1945.