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InSar Principle: How does it work? InSAR satellite is located 700km of altitude from the earth surface and the radio frequency is transmitted at the right angle from the flying direction of the InSAR satellite. The beam of the satellite can cover 70km of land area to take the picture. The microwave from the InSAR satellite is transferred to the surface to get the image then it receives the reflected wave with a difference of the wave phase. Because the depends on the deformation the transmitted wave phase would be different then based on the two different wave phase a sharp distinct image can be prepared. The InSAR satellite is used to measure the surface deformation as a map of the digital elevation.