Hi,

When i do PS time series analysis, i got the result as shown in the first figure ‘PS overview’. This figure shows all the PS points with their color rendered by the deformation rate. There is a very obvious spatial ramp pattern that northeast corner shows stronger subsiding while the southwest corner shows much less subsidence trend. It looks like orbit error or tropospheric error, which resulting in the ramp.

The next three figures i posted shows the statistics of velocity, residual height and height of the study area. These figures were resulted from choice of reference point. All of the histogram peaked at/around 0, so i believe the reference point is relatively stable.

I processed the in such a procedure:

First – SLC data import module, choose study area, master and slave co-registration. (after coregistration, i manually check the reflectivity map, and it is well aligned in google earth. The whole study area is 20km radius.)

Second, i applied the APS module. In the APS module, I input the estimated linear trend and height as close to what is shown in the figure (as you emphasized in the manual).

Third i applied the sparse point processing module, also input the estimated linear trend and height according to the figures.

At last, i output the results in Post Analysis- time series module.

I will appreciate it if you can suggest on how to solve this spatial ramp pattern problem.

Thanks,

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