Figure 6 Town of Uppsala with airfield to the right (bottom center) 
The white line leaving Uppsala upwards to the right is a railroad. 
Dark portions in centre of picture represents open fields, while the 
light areas are forests. (Flying height 3 000 m) 
4. SUMMARY 
A real aperture SLAR has limited angular resolution. This 
type of equipment accordingly is best suited for mounting in 
low-flying aircraft for applications that do not require ex- 
tensive area coverage. 
Both theoretical studies and practical experience of Ericsson 
SLAR has shown that it is well suited for ocean surveillance 
such as oil slick detection and sea ice mapping. The radar 
can also be used to study large scale variation of sea state 
and wave patterns but the resolution is not sufficient to de- 
tect individual waves. Another promising application is con- 
trol of sea charts since an archipelago can be mapped with 
accuracy. The information obtained is limited to features a- 
bove and just below the water surface since electromagnetic 
waves at radar frequencies do not penetrate water. 
When flying over land it is possible to map large scale fea- 
tures such as urbanization, waterways and railroads. It is 
also possible to distinguish farming areas, forests and moun- 
taineous terrain. The TV display gives excellent grey scale 
reproduction which could be useful for seasonal studies of 
vegetation. For this application it would, however, be desir- 
able to increase the ground resolution an order of magnitude, 
which is easily done.