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emre started the topic Earthquake deformation detection in the forum Sarproz Forum 1 year ago
Dear managers, I am using Sarproz software to study the 7.8 magnitude earthquake that occurred in Turkey on February 6, 2023. However, although I followed the steps in the Napa earthquake application example, I could not determine the displacement. The data I used are two sentinel 1 images dated January 29, 2023 and March 30, 2023. I am sharing…[Read more]
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emre joined the group sarproz-group 1 year ago
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periz replied to the topic Geocoding shifts in the forum Sarproz Forum 1 year ago
you previously posted your question in a discussion on a different topic, so, it has been moved here.
the question you are asking has been discussed in many other posts.
here an example:
https://www.sarproz.com/groups/sarproz-group/forum/topic/slight-offset-after-orthorectification-s1/
please read carefully the forum and the documentation before…[Read more] -
agata039 started the topic Geocoding shifts in the forum Sarproz Forum 1 year ago
Hi,
I have a similar problem after processing 109 images from Sentinel 1. I am investigating displacements over an underground gas storage facility using the PS technique. I’ve done the calculations based on the tutorial https://www.sarproz.com/publish/QYTutorial4.pdf. Obtained PS points are shifted as you can see in the attached file. What could…[Read more] -
agata039 joined the group sarproz-group 1 year ago
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periz replied to the topic Smart mode in SARPROZ in the forum Sarproz Forum 1 year ago
Hi,
a journal paper that described the core algorithms in Sarproz:
D. Perissin and T. and Wang, “Repeat-Pass SAR Interferometry with Partially Coherent Targets,” IEEE Transactions on Geoscience and Remote Sensing, vol. Volume 50, p. Pages 271–280, 2012.
a confe…[Read more]
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yaoshuyi started the topic Smart mode in SARPROZ in the forum Sarproz Forum 1 year ago
Hi
Is there any paper about the algorithm principle of smart mode in SARPROZ? I used smart mode in a manuscript and I wanted to find a most appropriate citation. In addition, I’m curious how does this nonlinear estimation work. I learned that smart mode is equivalent to a filter, but is there a more detailed description of it (like some equations…[Read more] -
periz replied to the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
you are right that a low number of images implies low robustness in the estimation of the coherence and a bias towards high values. That said, numbers are relative and dependent also on other factors. so, it is difficult to tell you what number to use without looking at your dataset and at your results in detail. play with the numbers and observe…[Read more]
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paulinanino replied to the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
Thanks, your help was very useful!
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paulinanino replied to the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
Okay! I understand much better.
And for the non linear weighning part, what would you recommend? I understand that the lower the number of images, the more coherence is required to trust the data, so m=0.8 would be a good value when it comes to few images, is that right?Thanks!
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periz replied to the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
Hi Paulina,
there are multiple things to consider in your case. An exhaustive answer to your question would require to discuss about various topics. You might want to take a Sarproz course to get more experience (in case, contact courses@sarproz.com). For the moment let me tell you that you should consider the APS estimation as an independent…[Read more] -
antig replied to the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
APS is long wave length signal. So 0.7 seems fine spatial diatribution for aps. In sparse point protssing u may use lower ASI 0.6 for exaple
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paulinanino started the topic APS processing doubts for my project in the forum Sarproz Forum 1 year, 1 month ago
Dear all,
I have some doubts about a project I am working on. I am using 25 interferometric images to measure deformations and in the “APS processing” stage I would like to use the filter “ampl. stab. index” > 0.8 since I have few photos, however, I get very few points especially in the area I am interested in (red rectangle in the attached…[Read more]
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periz replied to the topic Reading AutoConnex.mat file manually in the forum Sarproz Forum 1 year, 2 months ago
Hi Jaroslav,
at the moment, Sarproz saves the 25 reference points in a temporary variable. That variable can be accessed if you run Sarproz in Matlab using the pcodes version. You can access it if you type “fast” in the command prompt when Sarproz is running and the APS module is open and the function for automatic selection of reference points…[Read more] -
jaroslav started the topic Reading AutoConnex.mat file manually in the forum Sarproz Forum 1 year, 2 months ago
In APS processing module if Reference point is set to “Auto”, then Sarproz suggests 25 points to choose from.
I assumed, that if saved, reference point candidates shall be found in AutoConnex.mat file. Looking through file structure, I couldn’t locate said points myself, and thus I’m asking for guidance.
Am I searching through correct file?…[Read more] -
oliveiralenon joined the group sarproz-group 1 year, 3 months ago
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periz replied to the topic change detection in the forum Sarproz Forum 1 year, 3 months ago
the tif file is a 3 channels product. the inputs of the 3 channels (which you can pick up as you like) are all products that can be loaded in the scatter plot module. not as a color clearly (which has to be a scalar), but you indicated you wanted to threshold the MTCD product. so, in the boolean section of the scatter plot module you can implement…[Read more]
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seweryn replied to the topic change detection in the forum Sarproz forum 1 year, 3 months ago
thanks for your reply.
The results of multi-temporal change detection is a tif file that cannot be loaded in the scatter plot module. we need to have a .mat file like the results of change detection module. Could you please let me know how to load it in the scatter plot module?
Thanks
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wang joined the group sarproz-group 1 year, 3 months ago
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periz replied to the topic change detection in the forum Sarproz Forum 1 year, 3 months ago
Hi,
regarding your first question, the outputs of the multi-channel change detection module (shortly described here https://sarproz.com/manual/rgb_module.html) are common outputs that the radar community knows how to interpret. Usually, those outputs are evaluated visually. If you want to set thresholds, you have to build them yourself, e.g. via…[Read more] - Load More