sarproz-group

DEM

This topic contains 2 replies, has 2 voices, and was last updated by  bahari 1 year, 4 months ago.

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  • #1452

    bahari
    Participant

    Dear All,
    In site processing I use SRTM, but in visualization of DEM I see the area of processing with dummy values of DEM.
    I don’t know this is a main problem or not. If yes, how can I solve this problem. please find in attachment the DEM Visualization.

    Best regards,
    Nader

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  • #1454

    periz
    Keymaster

    Hi Nader,
    in your picture you can see 2 different types of NaNs (not-a-number):
    a. some spots here and there (usually in areas of steep slopes): they correspond to SRTM missing data. Sarproz interpolates those values when the DEM in SAR coordinates is generated. You can check the result after your process it, by plotting it with the “view parameters” module. This is not a problem.
    b. half of your picture which is totally blue. If you scroll the log file, I’m sure you will see a message in which Sarproz told you that some problems occurred while downloading an SRTM file. The sw also tells you that, since that files was not available, it was filled with zeros. To force the sw to download it again, delete the corresponding file in the SRTM folder. If you are not sure about which is the problematic file, just try to move one or some of them in an other folder and read the messages given by the software/plot the DEM again.
    good work
    d

  • #1455

    bahari
    Participant

    Dear dan,
    Thank you for your help, I downloaded manually the SRTM hgt files (for some of them with 0 values) and put them in SRTM directory.
    Now it seems the DEM visualization is ok.

    regards
    Nader

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