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ALOS 2 SCANSAR Displacement Result Error

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    • #3005
      rajabun
      Participant

      Hello Professor.

      Currently, i’m processing ALOS PALSAR 2 SCANSAR data. I use the DInSAR method to see the displacement and the single interferometry processing module in Site Processing module. I’m trying to see the result of displacement, but i notice something weird. The bar didn’t show negative result, instead it’s only show positive result. Then, i try to change the conversion to height (m) and the result is similiar.

      Did i make a mistake in the process ? Didi the result is right ?
      I’ll attach screenshots of the image.

      Thanks !

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    • #3009
      periz
      Keymaster

      Hi Rajabun,
      this is indeed a visualization bug. What is visualized is the content of the jpeg images which is written in a 0-255 scale. While we work to fix it, you can circumvent the bug by temporarily change the Max Matrix Size value in the advanced parameters https://sarproz.com/manual/adv_param.html In your case, you should write a value equal to 50,000,000. If you have a limited RAM, you may want then to restore the default value of the Max Matrix Size.
      best

    • #3010
      rajabun
      Participant

      Thanks for your reply, Professor.

      I was able to write the value of Max Matrix Size according to your suggession, equal to 50.000.000, in the advanced parameters. However, i still notice something weird in the result. The result of displacement and height are still similiar. The height isn’t similiar with the DEM.

      Is my statement correct ? Or there is a mistake in my statement ?

      Another question, can i change the range in the colorbar manually ?
      For example, i want to change the range in displacement result between 100 mm and -100 mm.
      Is it possible ?

      I hope you and your team could fix the visualization bug as soon as possible

      Thanks

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