Problems with Obtaining Images
from Satellites or Aircraft
Satellite Imagery
Available only when satellites are overhead
(often only once every 16 days)
Low resolution images (some are 75 feet per pixel)
Expensive ($650 per scene)
Subject to cloud interference
Airplane Images
Pilot & airplane must be reserved ahead of time
Expensive ($80 per hour to rent plane plus pilot expense)
Subject to cloud and weather interference
