Using GNSS reference area in StaMPS

As far as I am aware, when no reference area is provided to StaMPS, the software will use a mean of the entire scene as reference for point deformation (please correct me if I am wrong).

Thus, for studies of a given area of interest, it should be ideal to use a GNSS reference to calibrate the results.

Does anyone have experience with this? I would like to understand if the correct approach is to simply provide the coordinate of the GNSS system, however these sensors are usually located next or on a building, and I am afraid to not correctly select the sensor and end up using the building or other neighboring feature by accident, considering Sentinel-1’s resolution.

Also, once GNSS reference is used, do you apply the GNSS corrections after export from StaMPS?

Came across this tutorial which I think is relevant:

Specifically from page 29 which talks about some examples after using setparm('ref_centre_lonlat', [-99.280 19.446]).

Next, we can also estimate the standard deviation of the velocity estimates (relative to the reference
area) with DEM errors and ramps subtracted, run:
ps_plot(‘vs-do’)

Based on this, I think you just simply provide the coordinate of the GNSS system and StaMPS will calculate it instantly? (I’m not exactly sure) You can check the PDF for more details. I might try it myself using the global MAGNET GPS network.

however these sensors are usually located next or on a building, and I am afraid to not correctly select the sensor and end up using the building or other neighboring feature by accident

I wouldn’t worry too much about it. Unless your area really has sudden and sharp dips in displacement. Based on my experience deformation is usually a smooth gradient so at most you might have an error of a few millimeters if you accidentally select the adjacent pixel because the adjacent pixel should have similar deformation rates.