PSInSAR Result Analysis

This topic contains 3 replies, has 3 voices, and was last updated by  periz 8 months ago.

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  • #1161


    dear prof.Daniele

    Could you give me suggestion and opinion from my PS results?
    1. Why residual height results still rather high? In APS parameter I put -50 x 50

    2. Why thermal expansion is not linear with building height ?
    I have assumption, I dont know it’s true or not.
    -Right side area is more density than left area, so in right area thermal higher than left area.
    -Right area sparse of vegetation than left area

    Best Regards,


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  • #1171


    I am afraid this is an overfitting case.
    I suppose you do not have many images, so, in such case I do not suggest you to estimate the thermal expansion.
    Also, keep height and velocity ranges small in the APS estimation.
    Better you remove high points when estimating the APS.
    The APS estimation process should be kept as simple as possible. Later in the sparse points analysis you can estimate more things if the system is stable. But not in the APS.
    If your estimated results (vel dem and so on) look correlated, there is surely something wrong (in the APS inversion you are basically integrating errors…)

  • #3190


    What is the “normal” APS values for trend and H if I dont want to overfit?

  • #3191


    overfit is caused by trying to fit too many parameters in few data. the range of v and h does not cause overfit. range of v and h should be chosen depending on the analyzed area

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