BH 
154 
In the 10- to 30-meter resolution range the inspection of man's 
activities as well as the monitoring of natural phenomena become 
obvious applications of importance throughout the world. 
The economics of sensing the Eartn with a well-defined Mode 1 type 
satellite system calls for cost recovery (for perhaps 10 recordings 
per year) in the order of 25 cents per square kilometer on the 
average for the land and surrounding sea areas of the world. 
Tweny-five cents per square kilometer is a relatively small price 
to pay for such a capability and it is believed that users can 
readily be found who will pay this price for capabilities such as 
defined by Mapsat. 
Earth sensing from space, at least in so far as Mode 1 is concerned, 
is now considered to be cost effective and should be implemented 
on an operational basis.