sarproz-group

Single Interf.Processing. Geocode – Downsamp error (?)

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

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  • #1916

    artemiziy
    Participant

    Hello,
    menu Single Interferogram Processing.
    After processing, I’m trying to keep the “height” in the format “Geotiff 32” (Geocode).

    I choose “Downsampling factors” – 1, 1.
    saved a file named – Height_20150702_20150608_1_1_32 (4728 x 11383 samples)

    I want to make a pixel more “square” and I choose “Downsamp” – 3, 1.
    saved a file named – Height_20150702_20150608_3_1_32 (1577 x 3795 samples)

    for check I choose “Downsamp” – 1, 2.
    saved a file named – Height_20150702_20150608_1_2_32 (4728 x 11383 samples)

    it seems to me that the second checkbox “Downsamp” does not work.
    what files I need to attach?

    Best regards,
    Artem

  • #1917

    periz
    Keymaster

    Hi Artem,
    you are right, the choice to give 2 (different) downsampling factors is not very useful there. In fact the software is already outputing square pixels in geographic coordinates (that’s the reason why if you give 2 different numbers, the bigger one is ignored). We will correct it in the future.
    So, don’t worry about the shape of the output pixel. If you want to change the proportion of the pixel in SAR coordinates, use the multi-look factors in the insar processing options.
    d

  • #1918

    artemiziy
    Participant

    Daniele,
    thanks for the answer!

    Artem

    • This reply was modified 1 year ago by  artemiziy.
  • #1921

    artemiziy
    Participant

    Hi Daniele,
    you wrote: “use the multi-look factors in the insar processing options.”
    where these parameters is necessary to specify?

    in the menu “InSAR Parameters Selection”, in a group “Interferometric Options”, “Multi-looking Rg-Az” http://sarproz.com/manual/insar_params.html,
    or in the menu “Single Interferogram Processing”, in a group “Interferogram Processing & Writing”, “ML Rg-Az” http://sarproz.com/manual/insar_analysis_site.html ?

    Best regards,
    Artem

  • #1922

    periz
    Keymaster

    Hi Artem,
    if you want to process 1 single interferogram (usually you do it for the sake of trying and testing) then use the “Single Interferogram Processing” module.
    However, when you want to process a series of interferograms in a row, all of them with the same options, you can use the “InSAR Parameters Selection” module, and then you launch the button “interferograms processing” in the “site processing” window, “insar processing” frame. Such a button will apply the options chosen in the “InSAR Parameters Selection” to all interferograms loaded in the current images graph (visible at the top-left corner of the “site processing” window).

    Please consider that we are talking about a multilooking factor acting on interferograms. If you want to display your SAR data with a different proportion in range and azimuth in order to see a square picture, you can change the axis ratio using the corresponding button (axis image/axis normal) in the “advanced parameters” module: http://sarproz.com/manual/adv_param.html
    bye

    • This reply was modified 1 year ago by  periz.

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