SARPROZ ©

There is not much more to add. Take a bigger reference window, lower the SNR and the correlation thresholds, lower the minimum number of points. are you processing the full frame? if not, do it.
but the question is: what are you using these data for? for sure, no interferometry will be possible.
if you just want to plot the amplitude, you can…[Read more]

Hello everyone,

I am trying to follow Yuxiao SAR intereferometry tutorial with two ERS 2 images. I have downloaded 2 time close images (11.2010 and 09.2010). Loading images is fine, I have downloaded orbits manually and selected common area for extraction.

But when I come to co-registration, it always fails and button become yellow. I have read…[Read more]

Thank you for all the valuable advices professor.
Kind regards
Minos

1. next time zip the log before attaching it
2. next time read the messages from the sw. if you do what the sw tells you to do, we all save time. specifically, the sw told you to manually unzip the downloaded orbits files
3. you have also the option to do things manually. read well the link you posted:…[Read more]

The first series are the values coming from the processed phase. The second series are the values coming from the module you adopted for processing
best

Sarproz estimates a residual phase that can be attributed to the Master image.
I do not fully understand your meaning. Let’s say you have Image0 as Master and you get a low coherence at Image0. Then you change the reference image and you set Image1 as your Master. In this second case, which one is getting a low coherence value, Image0 or Image1…[Read more]

Thank you professor. I will do so as soon as possible.
Best regards.
Minos

yes void/nan values are interpolated

Your case needs to be debugged. Please arrange installing teamviewer 10 and let’s schedule a remote connection by email
best

Option A. just check the folder where data/results are saved. if your result is a full matrix, you will find also a jpeg image. E.g. in FITTED you find jpegs of each image. For map changes (in RESULTSCHDETECT), if they have been filtered, most of the area is zero, they are saved as sparse mat files, you can load them in matlab.

Option B. you…[Read more]

It looks like somehow my previous answer to this post went lost…
In your recap you list 3 main steps.
The first 2 are common to all Time-Series approaches.
The third one corresponds to the classic Persistent Scatterers method.
If you want to apply other methods, you might need to process interferograms first.
Also, in some cases you do not use…[Read more]

Dear Dr periz
thank you for quick reply. In InSAR analysis of 2 coherent images (with 1 year interval), I realized that the maximum range of subsidence is 17 cm in bowl center (Just as a theory), so is it logical to put (0 , -170) or (170 , -170) for linear trend? Also I found there is gap between the results of sentinel-InSAR analysis in SARPROZ…[Read more]

the default value of linear deformation trend is -100 / 100 mm/year.
when you estimate the def trend in the APS processing, you estimate it between close points (the network connections). So, -100 / 100 is already a pretty big range.
in any case, if you have no previous knowledge, the histograms and all plots you get after the processing will help…[Read more]

Dear Prof.Daniele
I have a question about APS estimation. Actually I have no extra data or no idea about the amount of subsidence or deformation size. So in processing parameters, What strategy should be followed about numeric value of the range in linear trend? The default value (-1.1) seems to be wrong in my study area.
regards
Hamid