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periz replied to the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum 7 years, 5 months ago
1. if you process the STAR graph and you do not use the coherence as weight, there is no need to generate interferograms (the sw uses unfiltered phase)
2. if you have few images, a possibility to make the system more stable is processing a non-star graph to add redundant interferograms. if you do so, you may want to filter interferograms and use…[Read more] -
sekhar replied to the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum 7 years, 5 months ago
Hi Daniele,
Thanks for your reply.
How should I apply spatial filtering to interferograms? What options I should choose?
Usually I follow the below procedure:
1. Generate interferograms (flat earth phase and DEM removal, goldstein phase filtering, no unwrapping)
2. APS processing (one-star graph, amplitude stability index, estimate linear…[Read more] -
periz replied to the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum 7 years, 5 months ago
Hi Sekhar,
yes, the lines appear because the image is subdivided into patches. however, they look like lines in the picture that you attached, but in fact it’s just an optical effect showing the higher density close to patch borders. if you zoom in, you will see that they still pick up real local maxima, and pixels are not aligned, so, you do not…[Read more] -
sekhar started the topic PSC interpretation based on Amplitude Stablity Index for RS2 images in the forum Sarproz Forum 7 years, 5 months ago
Dear Sarproz Team,
I am processing nine RS2 images to study temporal deformation over an area. In APS module > Sparse point selection group, I have selected Amp. Stb. Index > 0.6 and plotted PSC. The figure shows some horizontal and vertical lines along which the PS density is high. I could not see any kind of such pattern in my reflectivity map…[Read more]
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periz replied to the topic Sarpros Release 2017.2 in the forum Sarproz Forum 7 years, 5 months ago
Updates can be installed through this interface http://sarproz.com/manual/manage_version.html
if you encountered errors, please send us lasterror and log files
if you upload them here, zip them first -
bridgetwang replied to the topic Sarpros Release 2017.2 in the forum Sarproz Forum 7 years, 5 months ago
Hi,
I’m a user at univeristy. I came across the failure in downloading updates. I want to ask for the windows version, how to install the update software after downloading the psftp.exe ?
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sekhar replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
Thanks a lot for clarification..
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periz replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
Hi Sekhar,
in Sarproz parameters you find both “ampl. stab. index 1-sigma/mu”=ASI and “ampl. stab mu/sigma”=SA
what you call Ampl. Dispersion is DA=sigma/mu=1/SA
ASI=1-1/SA=1-DA
since in the APS module points over the threshold are selected, then you have to use ASI > .75
otherwise, you can apply more complex conditions (>< || && on multiple…[Read more] -
periz replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
Hi Sekhar,
in Sarproz parameters you find both “ampl. stab. index 1-sigma/mu”=ASI and “ampl. stab mu/sigma”=SA
what you call Ampl. Dispersion is DA=sigma/mu=1/SA
ASI=1-1/SA=1-DA
since in the APS module points over the threshold are selected, then you have to use ASI > .75
otherwise, you can apply more complex conditions (>< || && on multiple…[Read more] -
periz replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
Hi Sekhar,
in Sarproz parameters you find both “ampl. stab. index 1-sigma/mu”=ASI and “ampl. stab mu/sigma”=SA
what you call Ampl. Dispersion is DA=sigma/mu=1/SA
ASI=1-1/SA=1-DA
since in the APS module points over the threshold are selected, then you have to use ASI > .75
otherwise, you can apply more complex conditions (>< || && on multiple…[Read more] -
periz replied to the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
Hi Sekhar,
in Sarproz parameters you find both “ampl. stab. index 1-sigma/mu”=ASI and “ampl. stab mu/sigma”=SA
what you call Ampl. Dispersion is DA=sigma/mu=1/SA
ASI=1-1/SA=1-DA
since in the APS module points over the threshold are selected, then you have to use ASI > .75
otherwise, you can apply more complex conditions (>< || && on multiple…[Read more] -
sekhar started the topic Amplitude Stability Index in SARproZ in the forum Sarproz Forum 7 years, 5 months ago
I have few queries regarding PS point selection criteria in SARproZ.
1. In APS module > Sprase Point Selection Parameter, Amplitude Dispersion is termed as Amplitude Stability. Am I right?
2. How can I relate Amplitude Dispersion (mu/sigma) to Amplitude Stability Index (1-(sigma/mu)). For example, How can I select PSC with Amp. Dispersion <…[Read more] -
periz replied to the topic changing master image in the forum Sarproz Forum 7 years, 5 months ago
hi Ivana,
InSAR is by definition a differential operation, so, constant terms have no impacts.
What counts in the temperature is its variation, not its average.
Also standard deviation and variance are independent from the mean value. -
ivca-cz replied to the topic changing master image in the forum Sarproz Forum 7 years, 5 months ago
Thank you. My aCcess to matlab is now more complicated, but i will try to solve it somehow.
I think it is sometimes useful to change the master. There are two reasons why I consider it:
– the temperatures. The master temperature should also be in the middle of the temperatures measured, especially in case where ktemp is neglected (forced to…[Read more]
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periz replied to the topic changing master image in the forum Sarproz Forum 7 years, 5 months ago
Hi Ivana,
baselines are saved in the DataSet.txt file. However, it’s just an indicative number, since the baselines changes within the analyzed area. In the processing, such value is calculated from the orbital information.
If you use Matlab you can also load the baselines values using the command “fast”. They are stored together with other infos…[Read more] -
ivca-cz started the topic changing master image in the forum Sarproz Forum 7 years, 5 months ago
Hello Daniele,
I have a question about changing a master image for an already coregistered dataset. The reason can be e.g. the prolongation of temporal baselines when updating a dataset, to make the master more “central”.
If I change it in the DATASET SELECTION window, there is no change in DATASET_INFO/DataSet.txt. Is it possible to save it…[Read more]
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periz started the topic Sarproz Release 2017.2 in the forum Sarproz Forum 7 years, 5 months ago
Dear all,
we just released a new update.
The main changes relate again to the coregistration process, that underwent a major revision. Several new options are now available, including an improved use of topography, a new independent tiled algorithm (for processing images piece by piece, useful in case of images with variable antenna steering),…[Read more] -
periz started the topic Sarpros Release 2017.2 in the forum Sarproz Forum 7 years, 5 months ago
Dear all,
we just released a new update.
The main changes relate again to the coregistration process, that underwent a major revision. Several new options are now available, including an improved use of topography, a new independent tiled algorithm (for processing images piece by piece, useful in case of images with variable antenna steering),…[Read more] -
mahtab replied to the topic Sentinel-1A slave images extraction in the forum Sarproz Forum 7 years, 5 months ago
Hello Dr. Perissin
The problem was because of my data set, one of the images was corrupted. SARPROZ just works fine.
Thanks
Mahtab -
periz replied to the topic Updating stack of Sentinel-1 images failed in the forum Sarproz Forum 7 years, 6 months ago
Hi Matus,
try first the code I passed you by email, we’ll upload it after a few more tests
thanks - Load More