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from buildings or from tubing systems below the ground (28). 
Due to these very limited application possibilities this technique is 
not further treated here. 
8,Cost of remote seneinz imagery 
8.1 Introduction 
The cost of imagery made from an aircraft has been composed of the 
following three components: 
- cost. of mobilisation, which is the cost involved in flying the aircraft 
with the required equipment to the area of which the imagery has to be 
made 
— cost of flight, which depends on the size of the area to be covered and 
the required scale and overlap percentage of the imagery 
— cost of image processing, which may include geometrical correction, 
development of films and printing of positive or diapositive copies. 
Imagery from satellites is too costly to be specially made for à specific 
project. Satellite MSS (Landsat) imagery and photography (Skylab) can be 
bought at fixed prices per frame, but specifications of scale, overlap, 
spectral and temporal resolution cannot be adapted to ihe specific 
requirements of a project. 
Cost of terrestrial photography mainly depends on the time, necessary to 
take the photographs, which is again determined by the size of the area 
to be covered and the accessibility of the terrain. 
8.2 Cost of photography 
For aerial photography the cost of mobilisation is usually relatively low, 
provided appropriate aircraft and cameras are locally available. 
Climatological conditions (standby time), as well as the size of the 
area to be flown, influence the price per unit of covered area. However, 
for areas of a size larger than 1000 ne flying cost of the order of 
5-10 US $/kn* for scales between 1:20,000 and 1:10,000 may serve as an 
indication. For detailed photography of larger scales in à smaller area 
the mobilisation cost will raise the price per km“ considerably. 
Of those areas, where already photography of an appropriate scale is 
available, black and white prints or diapositives usually cost from