PRACTICAL APPLICATION OF SOME DIFFERENT DIGITAL TERRAIN MODELS 
Chief eng. Carl-Olof Ternryd, Sweden 
Layout for the report. 
1. The purpose of the report should be to show the application 
of some DTM:s. There is no intention to present any com 
parisons as to the result of the different models. It is 
more important in this beginning phase of development to 
show how the models work in practise. 
Therefore it is suggested that the photographs over the test 
area Wiesentheid, the summer photographs, are measured accord 
ing to the different models. 
The following models are to be used. 
The French Semis des points 1 
The Finnish 
The Nordisk ADB, Sweden 
The W-model, Sweden 
The W-model, Sweden, analytical photogrammetry 
The Terra DTM, London 
The DTM of Stuttgart 
The measurement 
An area of approximately 150 m (75 m on each side) around the 
polygontraverse 1-6 in the summer-photographs number IV - VI 
should be measured according to the principles of the actual 
DTM. 
With the aid of the DTM cross-sections shall be interpolated 
with an interval of 60 m along the straight line 1-6. The 
point interval within the sections shall be 10 ra. The total 
length of each cross-section shall be 100 m (50 m on each 
side of the traverseline). 
The result of the interpolation shall be accounted for numeri 
cally and graphically on the scale 1:100. The number and situ-