e 
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editing existing data bases on raster image background can be 
time-efficient and reliable. 
All available information, not only the basic image material, 
should be used for mapping. Existing maps, old aerial 
photographs, complementing satellite images, old files and 
tabular data are all most useful during interpretation. 
Take all aspects into account for choice of images. 
Operationality and availability, spectral versus spatial 
resolution, stereo or mono data, effect on total cost and time 
consumption. Simple answers do not exist. 
Digital Elevation Models and height contours can with today’s 
satellite technology only be produced in areas with favourable 
cloud conditions and for specific purposes. Height contour 
mapping from space requires on-track stereo and higher 
accuracy. 
6 ACKNOWLEDGEMENTS 
The experiences described in this paper are based on many 
individual persons and reports from the Swedish Space 
Corporation and SSC Satellitbild. To all who in this way, 
directly or indirectly, shared their knowledge with me, I am 
most grateful. 
I also want to thank the Swedish National Space Board whose 
financial support made it possible for me to present this paper. 
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