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Yuxiao started the topic New Update in Sentinel TOPS Module in the forum Sarproz Forum 6 years, 5 months ago
Hello everyone,
We are about to release a new update in Sentinel module. The update includes:
(1) Optimizations in the processing chain. The new version expects to save about 50% of the total processing time compared with the current version and also uses less intermediate disk space.
(2) As mentioned by Dr. Perissin in the previous post, we…[Read more]
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periz replied to the topic Graph Refinement Error in the forum Sarproz Forum 6 years, 5 months ago
– Regarding the first question/answer, is that valid also if after the Graph Ref (GRA) we recompute the atmosphere in the APS? Is that recommended (or when it is recommended)?
* if after the graph refinement you import the SPMRautosave in the APS module, you do not need to estimate parameters anymore. you have already estimated them in the g…[Read more]
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janbu replied to the topic Graph Refinement Error in the forum Sarproz Forum 6 years, 5 months ago
Sorry…file named GRA4 is actually in the APS module (when reading the SPMRAutosave).
Here are attached the following the images. MISP7 shows the “error” in the deformation pattern.
Cheers
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janbu replied to the topic Graph Refinement Error in the forum Sarproz Forum 6 years, 5 months ago
Thank you for the prompt answer. That was very helpful.
– Regarding the first question/answer, is that valid also if after the Graph Ref (GRA) we recompute the atmosphere in the APS? Is that recommended (or when it is recommended)?– I noticed that when we upload the autoconnex to the GRA, by default a connection coher threshold is populated. In…[Read more]
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periz replied to the topic Graph Refinement Error in the forum Sarproz Forum 6 years, 5 months ago
– Should we keep points parameter and value exactly the same as in the previous APS (that’s what I have done?
* are you talking about the “points densification” section? no. you can choose any parameter/value. in fact, the idea here is that you can add as many points as you want. You have already run the APS module. So, you have processed con…[Read more]
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janbu started the topic Graph Refinement Error in the forum Sarproz Forum 6 years, 5 months ago
Hi,
I have a few general questions on the Graph Refinement and a specific error that I got loading the connections back to the APS module.
– Should we keep points parameter and value exactly the same as in the previous APS (that’s what I have done?
– The Graph Refinement Window also gives the possibility to change the processing parameters. Of…[Read more] -
periz started the topic Sarproz Release 2018.0 in the forum Sarproz Forum 6 years, 5 months ago
Dear all,
in the past months we have been working on many small things and some major changes. It is not time yet to release the major changes, but it is worth to focus on the small improvements, now available in the new Sarproz version.
* VERY IMPORTANT: we have implemented some changes in the licensing system for Linux. Now you should be able…[Read more]
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cp02 replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
Thanks for your help and suggestions.
Best regards -
asteriospapas replied to the topic how to select a high quality reference point in PS processing in the forum Sarproz Forum 6 years, 5 months ago
thank you for your help and always fast response.
asteris -
periz replied to the topic how to select a high quality reference point in PS processing in the forum Sarproz Forum 6 years, 5 months ago
The reference point is a critical step. If the reference point is noisy, this can limit the precision of the final result. If the ref point is moving or if it is at high/low elevation, it can bias the result. If the ref point is in a remote area, errors can propagate and make the APS estimation worse. The software performs some automatic tests…[Read more]
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periz replied to the topic how to select a high quality reference point in PS processing in the forum Sarproz Forum 6 years, 5 months ago
The reference point is a critical step. If the reference point is noisy, this can limit the precision of the final result. If the ref point is moving or if it is at high/low elevation, it can bias the result. If the ref point is in a remote area, errors can propagate and make the APS estimation worse. The software performs some automatic tests…[Read more]
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asteriospapas started the topic how to select a high quality reference point in PS processing in the forum Sarproz Forum 6 years, 5 months ago
Hello,
always congrats on the work.
when looking for a good reference point for ps processing, what should we be looking for. Not only on the theoretical side but also from the software’s point of view and results.
What should we be expecting from the results of the specific point in the end process
(after the sparse point processing).thank…[Read more]
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periz replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
1. 20 images is a relatively low number. so, you have to be careful in choosing things properly
2. using the coherence as a weight means using the spatial coherence to keep coherent data and discard not coherent one. if you use the STAR graph, you should not expect high coherence, because of STAR graph long baselines. it means discarding data. it…[Read more] -
periz replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
1. 20 images is a relatively low number. so, you have to be careful in choosing things properly
2. using the coherence as a weight means using the spatial coherence to keep coherent data and discard not coherent one. if you use the STAR graph, you should not expect high coherence, because of STAR graph long baselines. it means discarding data. it…[Read more] -
periz replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
1. 20 images is a relatively low number. so, you have to be careful in choosing things properly
2. using the coherence as a weight means using the spatial coherence to keep coherent data and discard not coherent one. if you use the STAR graph, you should not expect high coherence, because of STAR graph long baselines. it means discarding data. it…[Read more] -
periz replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
1. 20 images is a relatively low number. so, you have to be careful in choosing things properly
2. using the coherence as a weight means using the spatial coherence to keep coherent data and discard not coherent one. if you use the STAR graph, you should not expect high coherence, because of STAR graph long baselines. it means discarding data. it…[Read more] -
periz replied to the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
1. 20 images is a relatively low number. so, you have to be careful in choosing things properly
2. using the coherence as a weight means using the spatial coherence to keep coherent data and discard not coherent one. if you use the STAR graph, you should not expect high coherence, because of STAR graph long baselines. it means discarding data. it…[Read more] -
cp02 started the topic analysis of APS results in the forum Sarproz Forum 6 years, 5 months ago
Dear Prof. Perissin,
I’d like to ask you for any suggestions and opinions about the analysis to better understand the parameters involved in the processing.I used Sarproz to analyse 21 Sentinel 1A images over one year. In the preliminary processing I analysed an area of 8 km (radius) for the coregistration of all images. In the final part I…[Read more]
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asteriospapas replied to the topic understanding aps estimations parameters and results in the forum Sarproz Forum 6 years, 5 months ago
I apologise for the delayed thank you.
We appreciate the help. The results, with carefully consideration of the above suggestions, were found really close to the expectation we had.
Thank you again and always congrats on the work being done. -
periz replied to the topic Undo step in the forum Sarproz Forum 6 years, 5 months ago
Hi Jaroslav,
surely, you can undo/recover lots of things in Sarproz (in fact, almost all operations).
In particular, you can undo “Residual fringes estimation and removal” by clicking on “reset flat/height constants”.
best - Load More