By now there are many fotos

available taken of the mesa from diverse directions.

Many features can be identi- fied on several fotos. If the distance between two features is known, it will be  possible to prove the resolution and to reveal distortions. The distan- ces must be determined with a foto which was taken from the zenith and which has the highest resolution. It is a basis for a calibration od other fotos.

Surounding points lying nearly on the same level shall define a plane of reference.

On two selected fotos the same 18 features can be iden- tified. It is assumed that they have the same level on the surface. The first foto has been taken from zenith and has a resolution of only 30 cm per pixel, whereby the distan- ces between the 18 frame points are known. In the second foto distortions can be determined with it and be taken into account for further calculations.

A point cloud is conntected to a net of triangles and the foto is projected onto its surcface.

By measuring the shift of a feature in a foto taken from a perspective view it is possible to deduce its height. Beside (x,y)-coordinates in the plane  this way features get a height z. Thus each feature gets 3d-coordinates (x,y,z) in space and form a point cloud. The points are connected to net of triangles, onto which the foto is projected.