paul

Forum Replies Created

Viewing 5 posts - 1 through 5 (of 5 total)
  • Author
    Posts
  • in reply to: A coregistration problem #3480
    paul
    Participant

      Hi Dr. Perissin,

      Thank you very much for the clear answer.

      Regards,
      Paul

      paul
      Participant

        Hi Daniele,

        Thanks for the suggestions.

        Paul

        paul
        Participant

          Hi Daniele,

          Thank you very much for the suggestions. The coregistration works well now.
          I did process the external DEM in SAR coordinates, but i did not choose ‘orthorectified’ in data export process, which is important. Besides, the data i am using is Sentinel data.

          Have a great day,
          Paul

          in reply to: Reference point selection #3062
          paul
          Participant

            Thank you for the information.

            It is sentinel-1A data. One interesting thing is that in Site Processing – APS estimation, i generated the graph, and it gives me 25 auto point, and i chose a ‘best’ point with good distribution. Then, i moved to Site Processing -Sparse point processing. When i checked the distribution of the parameters, there is a obvious bias in the parameters distribution (esp. for residual height and velocity). I think the distribution calculated here is from all the sparse points, instead of all the pixels like APS does. Do you have any advice on this?

            So from your suggestion, i guess that velocity is kind of more important than residual height when choosing the ref point.

            Regards,
            Paul

            in reply to: Reference point selection #3060
            paul
            Participant

              Thank you so much for the suggestion.

              About the reference point choosing, i still have a question. When i read the SARPROZ tutorial ‘Demo: APS Estimation Multitemporal analysis with Sarproz’, it says that best reference point should reflects that both velocity and residual height distribution peak at 0. However, in the Site Processing – APS module, i can see 25 auto reference candidate points. I checked every single one of them, and not any of them can do both – 0 peak at velocity ad residual height.

              From the manual, it is very clear that i should choose a point on the ground and stable, which corresponding to residual height and velocity peak at 0. My questions is that when there is no such a point, which rule is preferrable. If choose a stable point, it could shows a bias in residual height distribution, like what i showed in the previous images.

              Thank you again!!
              Paul

            Viewing 5 posts - 1 through 5 (of 5 total)