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periz started the topic First online Sarproz training course in the forum Sarproz Forum 4 years ago
Dear all,
finally we are ready to announce the first online Sarproz training course.
The course will last 10 days, 4 hours per day and it will be split into 2 modules (1 week each): basic concepts (radar, SAR, InSAR) and advanced ones (Time Series, A-DinSAR).
The first edition will be given in November. Only a limited number of registrations will…[Read more] -
chalu joined the group sarproz-group 4 years ago
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periz replied to the topic APS Estimate “Test” Results in the forum Sarproz Forum 4 years, 1 month ago
From your attachments, the best result is the linear one.
Few hints that work in general (but might not work in some particular cases):
1. when estimating the APS, better to focus on good scatterers, not affected by thermal or non-linear movement. so, using a linear model only is a good choice. you will include other more complex scatteters later…[Read more] -
antig replied to the topic APS Estimate “Test” Results in the forum Sarproz Forum 4 years, 1 month ago
Ho big is Your bridge. I it is less than km You may skip APS and use small area module
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ic350450 started the topic APS Estimate “Test” Results in the forum Sarproz Forum 4 years, 1 month ago
Hi All. I am working with a set 63 Sentinel-1A images (plus 1 Sentinel-1B image), ranging from 2015 to 2017, HH polarization, to detect seasonal deformation trends of bridges in Illinois. I have used the “smart = 5” option to monitor nonlinear deformations expected from the thermal effects on the bridges. Attached is a picture of the parameters…[Read more]
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periz replied to the topic PSInSAR Result Analysis in the forum Sarproz Forum 4 years, 1 month ago
hi,
to become able to recognize correlated results or to spot possible problematic signals, you need training and experience. difficult to help you much with theoretical statements. we should look at your results together and then we could give you some suggestions.
however, here some general hints:
+ it is correct to check that the peaks of the…[Read more] -
ic350450 replied to the topic PSInSAR Result Analysis in the forum Sarproz Forum 4 years, 1 month ago
Hi, I am having a difficult time understanding what to look for when evaluating the APS results and notice that in one of the comments above, correlation was one way of determining if the data looks incorrect. What exactly qualifies as correlation between DEM, vel/displ, integrated height etc.? After processing the data in the APS module, I…[Read more]
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n-ghasemian replied to the topic Reading slc images in matlab in the forum Sarproz Forum 4 years, 1 month ago
Thank you dr Perissin. It solved my problem. Now, I want to do phase unwrapping on the extracted phase values from binary files because the phase values are within the [-pi, pi] interval. How can I do this in Matlab?
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periz replied to the topic Reading slc images in matlab in the forum Sarproz Forum 4 years, 1 month ago
radar data are complex, not real
so, firstly, u cannot read complex data from jpeg files, u have to read the binary files
secondly, u have to tell “leggi” that data are complex
u do this adding a flag, according to this syntax: https://www.sarproz.com/groups/sarproz-group/forum/topic/aps-processing-4/
best -
n-ghasemian started the topic Reading slc images in matlab in the forum Sarproz Forum 4 years, 1 month ago
Hello dr perissin
It may sound a silly question but I want to know how I should read my slc images in matlab using leggi. I have already subseted my data and did co-registration. When I use the leggi function to read the images in the FITTED folder, I get the following error: error using memmapfile/subsref (line 764)
A subscripting operation on…[Read more] -
n-ghasemian replied to the topic Unwrappin APS phase values in the forum Sarproz Forum 4 years, 1 month ago
Thank you for your reply Dr. Perissin. Could you please explain more about the steps to get the raw interferometric phase values (just topographically corrected) using the PSI method in Matlab (my data is the time series of sentinel-1 images). I had already done the PSI method in the compiled version of SARProz, but I am confused about how to…[Read more]
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periz replied to the topic discontinuous phase plot in the forum Sarproz Forum 4 years, 1 month ago
hi, check this about phase jumps: https://www.sarproz.com/groups/sarproz-group/forum/topic/burst-lines-on-interfereograms/#post-5462
best -
periz replied to the topic burst lines on interfereograms in the forum Sarproz Forum 4 years, 1 month ago
good that you found the solution. however, I do not suggest you to use the ampl xcorr as default. we’ll try to find out a way to use it only in case of failures.
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antig replied to the topic burst lines on interfereograms in the forum Sarproz Forum 4 years, 1 month ago
I solved the problem myself.
the problem was in coregistration.Firstly I used “only orbits” mode for coregistration.
After analyse of Site.log the program had gave warning to that in coregistration has some thing wrong.I tried “Ampl Xcorr” mode for coregistration and it worked match better. No warnings, No Stripe
So in future I use “Ampl…[Read more]
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periz replied to the topic burst lines on interfereograms in the forum Sarproz Forum 4 years, 1 month ago
this is something we need to look at together. let’s plan a conf call via email please
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antig started the topic burst lines on interfereograms in the forum Sarproz Forum 4 years, 1 month ago
I generated an interfereogram from two Sentinel-1 phase images. In the interefereogram (Burst_line.png) has clearly seen stright lines that match bursts stich lines. I would like to fix it. What are the tools in SarProz to fix this kind of problem. I use compiled version.
Thanks for answer
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antig replied to the topic Unwrappin APS phase values in the forum Sarproz Forum 4 years, 1 month ago
You may set in module “Insar params” appropriate settings
Do not filter and multilook interferograms check “Flattening” and “DEM remove”
save settings
genereate interfereograms in module “interferograms protsessing” -
n-ghasemian replied to the topic Unwrappin APS phase values in the forum Sarproz Forum 4 years, 1 month ago
Thank you for your reply.
I need to do topographic correction before extracting phase values. The phases should mostly contain atmospheric and displacement phases. How should I do topographic correction in Matlab?
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periz replied to the topic Unwrappin APS phase values in the forum Sarproz Forum 4 years, 1 month ago
hi,
1. if you want to work on data in the way you describe, you should use matlab.
2. to read data in sarproz (in matlab), you can use the “leggi” function https://www.sarproz.com/groups/sarproz-group/forum/topic/aps-processing-4/
3. using “leggi” you can directly read the original images and perform all what you need without caring about APS…[Read more] -
n-ghasemian started the topic Unwrappin APS phase values in the forum Sarproz Forum 4 years, 1 month ago
Dear Dr. Perissin,
I am using the multi-temporal analysis module of SARProz (compiled version). I need raw phase values (before atmospheric correction) for my research. I assume that atmospheric correction is an unavoidable step in the multi-temporal analysis, and I can not skip it. The strategy that has come to my mind to get raw phase values…[Read more]
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