periz

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  • in reply to: Land Subsidence #8593
    periz
    Keymaster

      you are not obeying to the rules:
      https://www.sarproz.com/groups/sarproz-group/forum/topic/forum-general-rules/
      https://sarproz.com/manual/Sarproz_errors_management.html

      anyway, yours is an error caused by a new matlab version. we’ll upload a fix soon. in the meanwhile, either change the matlab version to an older one, or switch to the compiled version

      best

      periz
      Keymaster

        Hi
        the SICD format is not yet supported even if it’s on the todo list
        best

        in reply to: Questions about coherence-weighted network estimation #8522
        periz
        Keymaster

          hi

          In the modules APS Estimation, Sparse Points Processing, and Graph Analysis and Refinement, I understand that selecting “Coherence” in the “Weights” option allows SARPROZ to read the interferometric phase from the INTERFEROGRAMS folder and use the magnitude (i.e., coherence) as the weighting factor.

          correct

          Now, I have developed my own weighting scheme. I would like to ask: can I directly use my weights as the magnitude, construct complex values accordingly, and save them into the interferograms? Does SARPROZ use coherence directly as weights, or does it apply a transformation (e.g., using $\gamma^2 / (1 – \gamma^2)$ instead of $\gamma$)?

          yes you can and it will be directly used as weight

          It would be very helpful if you could point me to any references regarding the network-based weighted estimation. So far, the only relevant reference I know is:
          Perissin and Wang, 2012, Repeat-Pass SAR Interferometry With Partially Coherent Targets, IEEE TGRS.

          that’s the one!

          • This reply was modified 2 months ago by periz.
          in reply to: Spatially symmetric atmospheric filter #8514
          periz
          Keymaster

            Hi Marco,
            yes, the multi-looking factors helps adjusting the size of pixels with the intent to make them symmetric.
            And of course you are right that increasing the size of the filter in one dimension for un-symmetric pixels would make perfect sense. However, after a number of tests, we decided not to implement it, and to keep the size of the filter as small as the smallest resolution allows, based on our experience (or as small as the user likes).
            best

            in reply to: Exporting filtered amplitude images (e.g. MT Adapt) #8506
            periz
            Keymaster

              Hi Marco,
              indeed, there is no pre-defined section to explicitly export filtered amplitude images. We planned to implement it, but it was left behind because not much used, this is probably the first time we are asked.
              Anyway, you can still do it in a couple of ways.
              The first general way is through the View/Export Extended Data/Results.
              There, among the parameters, you find at the end of the menu “choose a real file”. you can then navigate to the folder “FILT_AMP” and pick you the image you want. Set manually the Saturation (default for amplitude is 0 3), check B & W as output and there you are. You can plot or export it.
              Alternatively, in the multi-channel change detection, you can select “use filtered amp” as input, and then you can plot/export the data. Notice that you can do it for a single multi-channel product with 2/3/4 images or for a sequence.
              Hope it is clear enough
              best

              in reply to: Import .mat files for coregistration #8498
              periz
              Keymaster

                Hi Vitaliano,
                the format of the images is not a big problem, you just need to write/read them using a couple of scripts that we can pass you. Some more care should be paid with the meta data, though.
                I believe the most effective way to deal with your case is to talk about it in a call.
                If good for you, please write an email to admin at sarproz dot com and we try to find a slot in these days
                best

                periz
                Keymaster

                  Thank you Tome
                  if you send the files to support at sarproz dot com we can create a web link and post it here
                  best

                  periz
                  Keymaster

                    Hi,
                    yes, of course, you can export SMALL AREA result in Google Earth
                    you do it from the geocoding module
                    check here https://sarproz.com/manual/geocod.html if you click on the menu of export options, beside the csv you have also jpegs and various kml formats. kml/kmz are Google Earth formats
                    best

                    in reply to: Possible error in debursts #8406
                    periz
                    Keymaster

                      the rar file was not uploaded either
                      13 images for a time series analysis is too limited, use at least 30 images
                      I suggest you write to support at sarproz dot com to better check the details
                      then we’ll post here the outcome of the investigation
                      best

                      in reply to: Possible error in debursts #8399
                      periz
                      Keymaster

                        The log file was not uploaded, try zipping log files in the future
                        from the inputpar file we see anyway that you are using an old Sarproz version
                        soon we’ll post here in the forum instructions to download Sarproz compiled with matlab 2022a
                        try again later with the new version
                        if issues perists, we’ll start investigating the log file
                        in the meanwhile, you can check images (searching for issues in the amplitude) and interferograms (to check possible phase jumps).
                        also, it’s useful to see the images graph to have an idea of your dataset
                        best

                        in reply to: Displacement linear graph not displaying in Google Earth #8321
                        periz
                        Keymaster

                          Please zoom in and keep clicking on points
                          you will see the time series
                          the point you picked up is just for visualizing the general picture from the distance, it’s not a real target
                          best

                          in reply to: Questions about Images Incidence Matrix #8307
                          periz
                          Keymaster

                            For some reasons we never noticed this post, sorry.
                            The variable you are mentioning it the Incidence Matrix of the graph (or network) connecting the images of your site/project. The graph is basically the way in which “interferometrically” connect the images you have. There are many ways to connect your images: you can use the star graph (with one image at the center, the Master), or the full graph (each image is connected to all others) and so on. You can find a list of options in the dataset selection panel.
                            Regarding the sign of interferograms (image A – image B or viceversa) please read this https://sarproz.com/manual/save_interfs.html
                            This is topic thoroughly treated in the course.
                            Best

                            in reply to: curvy edge of orthorectified image #8271
                            periz
                            Keymaster

                              exactly

                              in reply to: Data import #8240
                              periz
                              Keymaster

                                Hi, depending on the way in which you unzip your data, your data can be extracted in subfolders, masking the contents in a way that the software does not recognize them.
                                The standard way Sarproz recognizes sentinel data is, if the SLC folder contains directories called S1A_* … .SAFE or S1B_* … .SAFE
                                best

                                in reply to: Sentinel 1 IW SLC Product Reprojection #8216
                                periz
                                Keymaster

                                  No. You can do the reprojection yourself once you get the final output from Sarproz
                                  best

                                Viewing 15 posts - 1 through 15 (of 762 total)