Because the data are archived in a non-
Purposes, advance requests must be made to these agencies for proper
archival material.
Another satellite that is being planned for launch
in 1978 is Seasat; a synthetic aperture radar on this satellite is ex-
pected to provide useful data over lands as well as oceans. The
projected system has been well described by R.G. Nagler and
S.W. McCandless, Jr. (1975) of the Jet Propulsion Laboratory.
optimum manner for land analysis
II. INFRARED, MICROWAVE AND LUMINESCENCE OBSERVATIONS
Infrared: Solar and Thermal
Many of the recent developments in the use of solar infrared have
involved computer ratioing of visible and infrared radiation.
R.J.P. Lyon (1975b) has been successful in detectin
reflectance anomaly associated with
northern Norway where he found that the area of plant stress induced by
natural copper Poisoning shows low values in the band 7-band 5 reflec-
tance ratio. Lyon (1975a) also undertook a study, in cooperation with
the USGS and American Metals Climax (AMAX), which is underlain by a
"Sizeable molybdenum deposit." In this study, Landsat computer com-
patable tapes were processed to enhance images using the Stanford
University STANSORT1/ program (Honey and others, 1974). They found all
four bands of the Mss provided somewhat similar images principally
showing the topography of the area. By dividing any of the three bands
by the 4th (usually band 4), the sunlit and shadow enhancement of the
image could be removed. Using these and other "ratio" images, Lyon was
able to identify the known anomaly and found another previously unknown,
weakly mineralized area.
1/ Use of trade names in this paper is for description purposes only and
does not constitute an endorsement of the product by the U.S. Geological
Survey.
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