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When it is violated because natural phenomena generate large displacements and displacement gradients ( e.g ., volcanic eruptions , landslides ) , simple differencing of before and after topographic data should be adequate to define the changes to the degree of accuracy required for their study . Since the quantity on the left is determined entirely by the phases of the interferograms and the orbit geometries , the line-of-sight component of the displacement is measurable for each point in the scene . ) When nymphs first hatch , they are bright red with black wing pads then change to yellow with black blotches on their abdomens and black wingpads with a yellow stripe on each . Apples can play an important role in home cookery and nutrition . ' And yet , high quality , hardy pears are moderately easy to grow in the southern half of Minnesota — easier in some ways than apples . If each pixel on the ground behaves the same for each observation , calculating the difference in the phases removes dependence on the scattering mechanism and gives a quantity dependent only on imaging geometry . Apples stored near 33F may last as much as 10 times longer than apples stored at room temperature . These numbers are bound to grow as populations swell and are increa-singly concentrated along coast lines and mountain ranges , which often represent tectonically active plate boundaries zones ( Bilham , 1991 ) .