sarproz-group

ALOS-2 DINSAR. a displacement is too big

This topic contains 5 replies, has 2 voices, and was last updated by  periz 1 month, 3 weeks ago.

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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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