periz

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  • 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 weeks, 3 days 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

                                periz
                                Keymaster

                                  it surely makes sense to consider the temporal coherence of a point
                                  but not for estimating height and/or velocity
                                  the temporal coherence is used e.g. to weight the spatial integration of the APS graph
                                  best

                                Viewing 15 posts - 1 through 15 (of 761 total)