An image of the relative radar phase between co-registered coherent observations. A displacement changes the two-way path length, giving phase change proportional to , with sign set by the adopted range convention. A full wrapped phase cycle therefore corresponds to half a radar wavelength of line-of-sight displacement. Orbital geometry, topography, atmospheric delay and scattering changes must be separated from deformation; a fringe is not uniquely an elevation contour or an earthquake displacement.[ref]
Interferometry by NASA. Interferograms, half-wavelength fringes and removal of orbital and topographic contributions
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