sarproz-group

ALOS-2 DINSAR. a displacement is too big

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    • #3301
      artemiziy
      Participant

      Hello everybody,
      I am trying to process a pair of ALOS-2 images using the DINSAR method. But the fringes are located too often and the displacement is too large. I tried to use the function “Residual Fringes Removal”, but this did not change the result.
      Any ideas why this is happening and how to get a plausible result.
      Thank you.

      Pair info: Bn DC Bt Id Temp
      20160926 0 0.00 0 62 2.9
      20170925 -3 0.00 364 62 0.9

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    • #3303
      periz
      Keymaster

      do a full frame processing and post the interferogram again
      and also the log file

    • #3305
      artemiziy
      Participant

      Here is the full interferogram and log file.
      Thank you.

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    • #3308
      periz
      Keymaster

      this interferogram has problems. Either orbital or doppler problems. it needs further investigation

    • #3363
      artemiziy
      Participant

      Hello to all.
      I am processing the ALOS-2 data for the first time and asking for help.
      we contacted RESTEC. We tried to find out the technical details.
      they answered us:
      “JAXA L1.1 products are not focused in Zero Doppler geometry.
      Please check the format documentation and it required to calculate.
      For your reference:
      https://www.eorc.jaxa.jp/ALOS-2/en/doc/fdata/PALSAR-2_xx_Format_CEOS_E_f.pdf
      “PALSAR-2 Product Format Description”
      Look at pages 82-83 (Facility related data records Field 21-26), which
      contains table coefficients and equations.”

      those who worked with the data of ALOS-2, please help to understand.
      1. any product ALOS-2 L1.1 is always not focused in the geometry of the zero Doppler?
      2. in order to process the ALOS-2 data in Sarproz, they must be in the geometry of zero dopler, right?

      Thank you.

    • #3364
      periz
      Keymaster

      Sarproz manages both skewed and de-skewed data (zero and non-zero Doppler geometry).
      As previously said, your data needs further investigation: we need to look into the details for understanding what’s wrong.

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