transfer functions of. the camera optics, image motiön and 
film (see fig. 5). This determined the choice of. the 30 cm focal 
length for the camera. Nothing would have been gained using an 
existing 60 cm camera in ground resolution. 
Spacelab 1 will of course only demonstrate mapping capability. 
It does not yet have sufficient area coverage, nor the ultimately 
attainable resolution by cameras from space, since it is flown 
with an existing camera. Nor does it permit convergent operation 
needed for high precision altimetric contouring capability. 
However, a program for future missions including a special camera 
with image motion compensation and a larger focal length operable 
in vacuum with large amounts of film has already been conceived. 
It is intended that such a camera will be brought into orbit by 
space shuttle as a free flying satellite and collected during a 
later flight after exposures have been completed. Messerschmidt- 
Bôlkow-Blohm, Dornier and ERNO suggested multi-purpose structures 
for a low cost free flying satellite. A camera could be easily 
adapted. It is believed that such a venture, on the basis of 
international cooperation, could help to remedy the sad state 
of mapping in the world at small scales in a cost-effective 
scanner. 
/1/ United Nations; World Cartography, Vol. XIV, 1976