Varies with time, place, and objects in ways that cannot be fully predicted. Calibration is sometimes possible, but the exact nature of available electromagnetic energy is usually not known. Varies according to latitude, season, time of day, local weather, etc. No existing sensing system can operate in all wavelengths of interest. Likewise certain systems are limited by their high cost of operation.
Few systems operate with real-time imagery.
No single combination of remote sensing data and analysis will satisfy all users. Many users are not knowledgeable about subjects outside their immediate disciplines and thus cannot appreciate the full potential or limitations of remotely sensed data and images. Reference Lillesand, T.M. and Kiefer, R.W. 1994. Remote sensing and image interpretation. ES 771 is presented for the use and benefit of students enrolled at Emporia State University .