SARPROZ ©

As checked together,
probably there were corrupted files in the optical images directory, changing the directory or deleting/moving the downloaded Google Earth files solves the problem.
We take the chance to remind here that GE files are downloaded in this directory: ‘../GIS/GOOGLEEARTH/’
with reference to the current site directory.
In case of…[Read more]

Hi Ivana,
that error happens while loading the image in the background.
The sw searches in the directory that you can change through the “layer” button.
If you change the directory, you should temporarily solve your problem.
To investigate why that happens, you could save the small area (with the same conditions as when the error occurs)
and pass…[Read more]

Yasser,

In Sarproz you can implement almost everything. However, instead of having buttons as “PSI”, “SBAS”, or whatever, you have a series of tools/options that you can combine. Clearly, this requires understanding the operations. It’s more difficult than having predefined buttons, but I think it’s more powerful.

The 2 conditions you mention…[Read more]

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.