Abstract

For Side Looking Airborne Radar (SLAR) mapping projects of extensive flat regions such as the Amazon basin, mosaicking procedures have been in use. In the particular case of Colombia's PRORADAM (Projecto Radargrammetrico del Amazonas), a simple sequential SLAR block adjustment produced the metric base for mosaicking. The present report analyzes the relative merits of the sequential versus three methods of simultaneous adjustment of a SLAR block. It is demonstrated that sequential block formation with spline functions, followed by external interpolative adjustment produces very good results. Simultaneous planimetric block adjustment with similarity transformations (ANBLOCK), affine transformations or tranformations with spline functions cannot easily approach or surpass these results. These conclusions were obtained on the basis of controlled experiments with simulated SLAR imagery, implementing parameters of actual SLAR mapping projects.

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