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periz replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 8 months ago
the smart function is a non parametric model, basically a time filter that smooths residuals. thermal expansion is a function of temperature, which has a smooth component in time (like a sinusoid with 1 year period), but also higher frequencies fluctuations. the smart model would compensate only for the smooth component, while actual temperatures…[Read more]
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bridgetwang replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 8 months ago
Thank you so much for the rapid reply!
As for “estimate as well as possible the non linear model”, I wonder what’s the difference between using a non-linear model built by myself(e.g. include deformation induced by temperature or water level) and using the “smart” non-linear model?
Additionally, I know that I can use higher threshold for point…[Read more]
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antig replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 8 months ago
Additionaly, I suggest to use Graph Analysis and Refinement module. It is between APS and SPP button. There is possible to remove low coherence connections and improve APS graph.
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periz replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 8 months ago
Hi,
1. in the APS module the aim is estimating the APS, not the model parameters.
2. the APS is estimated from phase residuals. phase residuals = original phase – model. if the model is wrong, phase residuals will be wrong and the APS will be wrong.
If you have non linear signals, given the 2 above statements, you should either estimate as well as…[Read more] -
bridgetwang replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 9 months ago
finally the linear model with thermal expansion is added.
By the way, the temporal coherence with index “_1” is the coherence before removing APS.
Looking forward to your reply. Thanks very much.
Best regards
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bridgetwang replied to the topic results from different model in APS in the forum Sarproz Forum 3 years, 9 months ago
the result of linear model is added here
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bridgetwang started the topic results from different model in APS in the forum Sarproz Forum 3 years, 9 months ago
Dear Prof. Daniele,
I have some questions when using APS for my dataset. I got 83 images from Jan 2017 to Dec 2018 covering a center city.
As the city has many buildings, and the images are dense in 2 years, I assume the deformation will be non-linear, and for buildings there will be thermal deformation. So I use 3 different models in APS…[Read more]
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periz replied to the topic Main.exe stop working in the forum Sarproz Forum 3 years, 9 months ago
there is some conflict between your operating system/hardware/software configuration and the Matlab MCR. Write to support at sarproz dot come and ask for the Sarproz version compiled with matlab 2017. it might solve your issue
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netrabahadurkatuwal started the topic Main.exe stop working in the forum Sarproz Forum 3 years, 9 months ago
Dear Perez,
When I open the main.exe file and it works successfully to get contents steps after that it directly stops working. Is this problem in the main.exe file or on my computer? -
periz replied to the topic Reading interferograms using leggi in the forum Sarproz Forum 3 years, 10 months ago
hi
you are trying to read a geocoded interferogram. geocoded data should be read with proper tools, as gis engines. or otherwise just import the geotif file in any coding environment, if u have geotif libraries.
leggi/scrivi are functions to be used in sarproz with sarproz-format data in SAR coordinates -
n-ghasemian started the topic Reading interferograms using leggi in the forum Sarproz Forum 3 years, 10 months ago
Dear colleagues,
I have some interferograms and I want to read them using leggi, but I get this error:
“Here a brief error message:
A subscripting operation on the Data field attempted to create a comma-separated list. The memmapfile class does not support the use of comma-separated lists when subscripting.
leggi: an error happened while…[Read more]
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chalu replied to the topic First online Sarproz training course in the forum Sarproz Forum 3 years, 10 months ago
Wow,well done!! Am so happy to engage on this online tutor !!!!
As I am going to use sarproz for InSAR analysis for the first time,this chance is so valuable!!
But am afraid of fee conditions for registration!Thank you!
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zeeshanafzal replied to the topic First online Sarproz training course in the forum Sarproz Forum 3 years, 10 months ago
Great job. i am quite glad to know about it. thanks
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wmzhou replied to the topic First online Sarproz training course in the forum Sarproz Forum 3 years, 10 months ago
well done.
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periz started the topic First online Sarproz training course in the forum Sarproz Forum 3 years, 10 months 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 3 years, 10 months ago
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periz replied to the topic APS Estimate “Test” Results in the forum Sarproz Forum 3 years, 11 months 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 3 years, 11 months 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 3 years, 11 months 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 3 years, 11 months 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] - Load More