SARPROZ ©

* numbers are always relative to the particular case. E.g. .85 with 35 images is different than .85 with 90 images. With 90 images, you can take this threshold lower. to get an idea, plot the histograms of these parameters in your area of interest
* the bad looking APS you plotted above deserves some closer look. probably you got some…[Read more]

Hi Uros,
before discussing about possible processing solutions, one has to observe well the data: how many images do you have and their temporal/geometric distribution, what sensor and acquisition mode, how do reflectivity map and amplitude stability index look like. Then, when the case is complex, better to generate also MST interferograms. When…[Read more]

Hi Steffan,
sorry for the late answer. We need to find some time to check your data. We need to see things from the beginning.
For the moment, I can suggest you to check this simple exercise https://www.sarproz.com/yuxiaos-tutorials/
(the last tutorial). It gives you an idea of the results you should see step by step
best

Yes, there is surely something wrong.
We should check the APS results

In all geocoding functions you have a menu and you can choose among kml, geotiff RGB, geotiff 32
The last option exports the actual values and you can load them into a GIS software
Here more infos: https://sarproz.com/manual/geo_sito.html
And here a similar answer with more options:…[Read more]

the displacement you detect from InSAR is along the LOS.
To get displacement along track, you may use pixel tracking.
We do not have yet a proper specific module for pixel tracking, but you can still perform it.
Here an exercise showing how to apply pixel tracking (the third tutorial):
https://www.sarproz.com/yuxiaos-tutorials/
best

inside the SLC folder
you should have a directory for each image
each directory should contain all original files (img, led, trl …)

1. read the forum and search for similar questions. Here an example: https://www.sarproz.com/groups/sarproz-group/forum/topic/coregistration/

2. for Sentinel, you can use the orbital approach: https://www.sarproz.com/groups/sarproz-group/forum/topic/new-update-in-sentinel-tops-module/

However, your case may be challenging for the TOPS…[Read more]

1) You are using an old version
2) You are missing required toolboxes.
please request an updated compiled version
best

If you are talking about the normalization option that you can find here: https://sarproz.com/manual/change_detect.html (sorry, I noticed we did not include yet a module description in the manual -but you can find several tutorials on it…-) the idea is the following:
change = filter [ (A1 – A2)/(A1 + A2) ]
The normalization allows detecting any…[Read more]

Here you inputed a threshold on the connections length.
When you do so and you get isolated points, the way to fix it is using the graph analysis and refinement module.
We will implement a modification in the near future to remove isolated points at the time of the graph creation in the APS module, when a threshold on the connections length is inputed.

1. if DemSynt is not found it means you have to generate it via “external DEM and synthetic amplitude in SAR coordinates” (this could be the reason for wrong georeferencing)
2. if an SRTM tile is all zeros there are 2 possible explanations: (a) it’s on the sea (b) the sw tried to download it but there was a failure. If (b) then delete the all…[Read more]

First of all, check well the data. Usually Sentinel should have good orbits, not requiring a manual GCP (keeping current orbits option works in most cases). By the way, what DEM did you use?
About posts, if he post is big enough and isolated (like those in parking lots) it should be firly well visible also in Sentinel data.
Buildings can be…[Read more]

check this tutorial: https://www.sarproz.com/publish/tutorials_partIV.pdf
best

Hi Steffan,
to properly judge the geo-referencing you should observe carefully the reflectivity map (not the changes) and you should look at multiple areas. If all areas present the same coherent shift, then it is a problem that can be corrected by choosing a GCP. Check this tutorial: https://www.sarproz.com/publish/data_import_partII.pdf
If the…[Read more]

It looks like you are missing the Matlab Signal Processing Toolbox.
You can use the compiled version instead
best

At the moment no automatic import of external APS delay map is implemented.
However, you can do it in many ways if you can manipulate your data.
Inverted Residuals atmospheric delay is saved in the ATMOSPHERESGRAFO folder
they are binary files
The size is S/DSF x L/DSF (precise rounded values are in DimAtmo.mat, same folder). APS values are in…[Read more]

If you use the smart option, the modeled displacement is a non-parametric estimate of the displacement. In other words, the smart option filters the displacement, and the filtered series is the result.
modeled_disp = filter ( displacement )
The cumulative displacement in Sarproz is always calculated based on the model, so
cum_disp = modeled_disp…[Read more]

Hi Van Anh,
how to distinguish between landslides and subsidence is a question that relates to the interpretation of the results, not to the processing, so, it’s something beyond the scope of this forum.
About QPS processing, usually we consider it an advanced topic that one can tackle after having well digested more simple approaches.
Anyway,…[Read more]