sarproz-group

east-west and up-down time series

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    • #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

      • #4589
        umutcan9821
        Participant

        Hello Dear Friends, Could you please share with me a document that explains the steps of east-west displacement in Sarproz by using Sentinel1 data. I will really appreciate your support.

        Thank you very much.

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