sarproz-group

east-west and up-down time series

This topic contains 4 replies, has 5 voices, and was last updated by  matusbakon 3 months, 3 weeks ago.

  • Author
    Posts
  • #2780

    adugna
    Participant

    Hello everybody, I would like to estimate east-west and up-down time series from ascending and descending displacement time series. The time series function in the Multi-sensor module is not complete so is anybody aware of other tools (qgis) or techniques that can estimate the time series without extensive coding?

    Thank you!

  • #4082

    umutcan9821
    Participant

    Hello Dear All,
    I have the same question as mentioned by @adugna. IS there any way to analyze the Sentinel-1 data in the east-west direction in Sarproz. If there is, could you share documentation about that. Thanks

  • #4087

    periz
    Keymaster

    At the moment you can project the velocities using the Multi-Sensor module
    Here a bit of description https://sarproz.com/manual/multi_sens.html
    In the next future we will implement also the projected time series export
    Best

  • #4088

    serena
    Participant

    Hi all,
    I don’t know if there is a QGIS tool to compute the up-down and E/W component, let me know if someone knows.
    Anyway, it is possible to follow this procedure: 1) starting from geocoded results, resample the measurement points (MPs) using the same grid for both ascending and descending; 2) for each cell, separately for asc and desc, compute the average velocity (to obtain a finer estimation you can use a weighted function accounting for the distance of the MPs from the cell center); 3) apply the vector composition to estimate up-down and E/W vectors. The LOS direction is in the SiteDescription.txt file (i.e. AcqHeading <<the angle with respect to the North>> AcqIncAngle: <<incidence angle with respect to the vertical direction>>)
    Regards
    Serena

  • #4089

    matusbakon
    Participant

    Hi,

    There’s simple approach for LOS decomposition published here (see Appendix):
    https://earth.esa.int/workshops/fringe09/proceedings/papers/s12_3esfa.pdf

    The strategy is further described and applied for example here (Section 4. Results, end of page 4):
    https://reader.elsevier.com/reader/sd/pii/S1877050916324346?token=771278C7AFAA466F3FEEF289F7DDE6C8713E460ECCAC46B1744B76C398E13CFE4F2CCE6624E6054633DA8418CD70D520

    Although, east-west component refers to “azimuth look direction” here and only 2 orbit tracks are used, for obtaining east-west component and more robust transformation 3 or more satellite tracks should be used (some details can be found here: https://www.springer.com/la/book/9781402094279). Obtaining vertical component should be even easier as you just need to multiply LOS displacement with cosine of an incidence angle.

    Cheers

    Matus

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