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combination of a geographic information system with a photogrammetric plotter 
by simple underlaying of the orthophoto with the image in the information sys 
tem. Beside these newcomers, the classical analytical plotter with a device for 
superimposition might still remain the principal mapping system for high pro 
ductivity and for high-precision tasks. 
Fig. 3 
Typical frame for multi-templet matching with terrain approximation by finite ele 
ments. The image section has been digitized for image matching and reproduced on a 
laser printer (512x480 pixels). The regular grid shows the triangle surfaces of the finite 
elements and is used as reference for the representation of the height parallaxes. The size 
of the parallaxes is represented by the displaced lines; a displacement to the left indicate a 
lower terrain and a displacement to the right a terrain elevation. One remarks the 
important parallaxes measured on the house in the lower part of the image.