3d-Kap: photogrammetry using KAP-images
When multiple images are taken from a different position of the same object or surface, it is possible to create 3d models of this object or surface. Such a 3d-model is more or less a map of the elevations and is called a Digital Elevation Model (DEM), or Digital Terrain Model (DTM).
A DEM can be used in many ways, for example to analyse the way water is running of a mountain, or in archeology to analyse and map remains of the ancient structures.
When DEMs of the same field are made on a different moments in time, the change in elevation tells the amount of erosion of this field after for example a rainstorm. DEMs are often created using regular Aerial Photography of using laser altimetry, both are expensive because they require an aircraft and expensive sensors.
Because DEMs can be extremely useful in geographical, biological and archeological studies it would be interesting to devellop a simple inexpensive and high precision system. A study has been done and it proved to be succesfull to use simple consumer-grade digital cameras which are lifted using a kite for photogrammetry.
Two overlapping images taken from a slightly different location. The images measure about 40 by 30 metres.
The digital elevation model (DEM). The maximum difference in elevation is about 1 metre.
An obligue view of the DEM