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Much of this variation can be attributed to the fact that average elevation is only a poor proxy for the way topography controls the erosion rate . In seismic zones , the spatial density of points required to explain the sources of crustal deformation is strongly influenced by the thickness of the elastic layer . Because the effect of orientation errors depends in part on look direction , and because many points on the Earth 's surface will be measured at least once by each system , the systematic errors in the two measurements will be largely independent . For mountain glaciers , high relief , high spatial variability , and rapid temporal variation may complicate the acquisition and interpretation of SAR interferometry data . Early in the growing season spots enlarge slowly , then , after the iris blooms , the spots enlarge rapidly .