@EJFielding I selected a reference point after obtaining the horizontal displacement map, subtracted the value of its horizontal displacement, and obtained agreement with the measurements of GPS points. Also, after obtaining the vertical displacement map, I selected another reference point and subtracted the value of its vertical displacement, and there was a convergence with the measurements of the vertical displacements of GPS points . Is the work I did correct? Thank you very much for always helping me
When comparing to GPS measurements, you should always project the 3D GPS measurements into the original InSAR line-of-sight directions, not compare them to the derived horizontal and vertical displacements.
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