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Is heading angle in 'SiteDescription.txt' file +ve w.r.t to geographic north?

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This topic contains 1 reply, has 2 voices, and was last updated by  espiritocz 2 months, 3 weeks ago.

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  • #3069

    sekhar
    Participant

    In the SiteDescription.txt file, I have observed a value for ‘AcqHeading’. I believe this as the heading or azimuth angle of the satellite. If so, is it calculated positive with respect to the geographic north?
    For a particular S1 dataset acquired in ascending mode (track 72 over Iran), ESA SNAP software shows platform_heading_angle = -129.6 deg whereas for the same dataset SARPROZ shows AcqHeading = -169.6 deg. I do not know why they are different. Please clarify.

  • #3070

    espiritocz
    Participant

    Hi,

    try to draw the angle to the piece of paper. You will realize that the value -129.6 deg is not the heading of the satellite track, while the value from SARPROZ is really heading angle of the satellite from the North (azimuth angle).

    best,

    M.

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