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Hi Yasser,

original PSI: STAR graph, no weights, no filtering
QPS: non-STAR graph, weights (spatial coherence), filtered phase
Anyway, Sarproz gives you the choice to combine those options and do what you want. You do not need to call what you do “PSI” or “QPS”.

However, you have to be aware of the following: when you choose the option “coher”…[Read more]

Yuxiao,

can you check one image is detected as ascending?
thx

That is the incidence matrix of the images graph
each row is a connection between 2 images
each column represents an image
in a row, 1 and -1 locate which image to take with the plus sign and which one with the minus
interf = im1.*conj(im2) = a1.*exp(j.*ph1).*a2.*exp(-j.*ph2)
read the various QPS papers in the publications section

it should be the same bug reported by Ivana,
so, the solution may already be online

Hi Ivana,

thanks for the feedback, it’s a bug, we are uploading a fix, it will be ready online soon!

Hi Yasser, the reply of a similar answer is here:
http://www.sarproz.com/groups/sarproz-group/forum/topic/doubling-number-of-graph-connection-to-mst-estimation/

if your matrix is small is just because there were no interferograms with coherence higher than the threshold you used…

hi Yasser,
first of all, are you aware that you can put the software in “help mode” and receive some description for each module of the sw?
You can do this with the corresponding flag in the main window.

If you will do it, you will see that you only need to select a geotiff file to load a dem in such format.
The corresponding module and help file…[Read more]

Hello,

this is my second experience with the MISP/time series module, and I am getting an error I did not get for the first time, so maybe I did something wrong, but in the previous version (21-Mar), it still works.

Thank you, Ivana

For the coregistration the same applies:
the final aim is to have all images coregistered on the same grid.
If you do this by processing the coregistration via a STAR graph or via an other graph, the accuracy/precision may be different, but the final result will be the same: N images coregistered on one common grid.
By the way, up to this moment…[Read more]

Hi Yasser,

first of all, the concept behind: changing the graph does not correspond to a fully new analysis (like re-starting from the beginning). It’s just a different way to combine your data. Soon we will allow to change it also from within some modules to make it easier and more convenient.
If interferograms are missing it’s easy to detect,…[Read more]

I want to add one point that:

In small area processing the resolution of your background Google Earth Image goes with your area. If your area is really small then SARPROZ downloads the highest resolution possible. If your area is very large then SARPROZ will download the image with a much coarse resolution. The size of the Google Earth image…[Read more]

Yasser, “Custom Mask Generation” under Sparse Points Selection in Site Processing window could help you also.

I would consider KML export from Small Area quite handy as well. The best part of it are possible fast changes of Ref. Point since exporting through Sparse Points Processing requires APS processing until Ref. Point is selected and playing with Load Mask/Scatter plots.

If zooming and panning is an issue, it means that the area is not small.
The small area module allows you to do lots of low-level operations for data investigation.
If your aim is just browsing the data (and the area is not small), then you do not need the small area module…
If you just want to export part of your results: load a starting mask…[Read more]

Why do you need to export a kml from the small area?
The geocoding module allows you to download a background image from google earth.
You can look at your data in many ways and display all what you want, even in 3d.
If for some reasons you need to export the results in kml, you can still do it from the site processing, using the sparse geocoding module…

Hi Yasser,

the APS module, is the “core” of the multi-image InSAR process (say PS, QPS analyses). As you probably know, to extract as more information as possible from your dataset, all images need to have the same technical features (resolution, incidence angle, polarization, etc.).

Also the number of images is very important. If you have only…[Read more]

hi KM
GE has some issues in linux. If it crashes without reasons, you should re-install it. If it crashes when called from Sarproz, probably it’s because there was already an other GE instance running. We did not find yet an external solution for this. So, Sarproz offers an option to manage it “internally”: there is a flag for disabling the…[Read more]