Remarks: 
Examples for this paper have been created by Dr. K. 
Pyka, Institute of Geodesy, Technical University Cracov, 
Poland, in the time of his visiting research at the 
Institute of Photogrammetry and Remote Sensing of The 
Vienna University of Technology. He compiled the 
examples using SCOP - a program package for DEMs. 
With its new modeles SCOP.INTERSECT (Sigle, 1991) 
and SCOP.PIXEL (Ecker, 1991), SCOP meets the 
requirements as mentioned in chapter 4 to a 
considerable extent. Development is started to yield a 
new edition of SCOP (Molnar, 1992); it is to facilitate 
such capabilities, and to enable easy integration with 
other (host) software systems. 
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