Further Development of Objective Methods for Registering Landmarks and Determining Cloud Motions from Satellite Data
STANFORD RESEARCH INST MENLO PARK CA
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The report describes continuing research to develop automatic methods for measuring cloud motions from digital brightness data obtained by geosynchronous satellites. A series of computer programs are described that register successive pictures using landmarks, normalize brightness for changing illumination, locate brightness centers tracers for groups of cloud elements, match brightness centers in pairs to obtain a smooth field of motions, and transform the motions from tape coordinates to earth coordinates. The methods are economical computationally since coordinate transformations are made only to the cloud motion vectors obtained, and not to the millions of brightness elements of an image. Also, a data compression is accomplished by representing groups of bright points by their centers plus descriptors of the group shape.