Abstract
The problems of airborne infrared optical-mechanical scanning are discussed with respect to the determination of the ground and water surface temperature distribution for meteorological purposes. It is found that the usual line scanning with normal scan plane is not advantageous, above all when the ground is covered with vegetation. Better results will be received if the scan plane is inclined from the normal, e. g. with an angle of 50°. The best possible mode for meteorological surface temperature determination however seems to be circular scanning since with it (in a plane terrain), path length and inclination angle are constant within the total scanned region. For the coordination of the scanned terrain with the resulting thermal images, convergent scanning for stereoscopic imaging is proposed for line scanning as well as for circular scanning. For the latter a combination of the circular scan curve with an elliptical one is found to be useful.
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