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Hi PY,

my suggestion would be first of all to look at interferograms.
case A. you have no coherence. Then the question is: is it on the mountains?
case A1. yes it’s on the mountains. Then download the last sw version and use the DEM-dependent coregistration refinement. This module requires a well aligned DEM. And it still needs some optimization…[Read more]

Dear Ana,

Indeed the area should be larger – don’t worry to extend it. To check the small area (after you prepare project using bigger area), there is special Toolbox in Sarproz called Small Area Processing. It works very well!

Milan

download the last pcodes (through the “manage version” module), I included a version check and an automatic choice between flip and flipdim

You mean I should rename the MATLAB system function file “flipdim”?

But I found three flipdim.m files in MATLAB, which one should I choose?

this is a new matlab function: flip.
if you get an error, it means u do not have it, that is, u have an older matlab
I’ll insert a simple version check.
U can quickly solve it by copying and renaming the function “flipdim” to “flip”

Thank you,professor.

I download a new version instead of the old one and the problem has been solved. But another problem is coming when I clicked “master extraction”…

THis zip file included lasterror.mat and log file

IMPORTANT NOTE:
to upload mat and log files, please zip them.
Without them I cannot track the error
Anyway, I guess that you did not download the last sw version, did you?
To do so, use the “manage version” module.
I think that that error was a temporarily caused by a sw update and it was already fixed…
d

Hi Ana,
the size you have chosen is even smaller than the (default) reference window used for the coregistration (64 pixels as you can see in the coregistration parameters).
Maybe if you make those numbers match it will work (I never tested the smaller possible area to coregister).
Usually, even for test or educational purposes, we take bigger…[Read more]

The files couldn’t be uploaded.The error was
Undefined variable “p_orbit” or class “p_orbit.coef_pos.x”.

Dear Prof.Daniele

I just solve my problem. Now, I can understand why the SAR image (Refl.map) like that.
Thanks very much

Best Regards,

Ana

Hi Ana,
from the pictures you are attaching here I cannot see your problem.
Did you generate the kmz file of the Reflectivity Map? Only with that kmz you can see if your image has been geocoded well.
Please consider one factor more: for precise geocoding, you (the software) need to consider also the external DEM.
if you geocode the reflectivity…[Read more]

Dear Mr.Daniele

In your tutorial you say that if we are not really satisfied with the automatically selected point. Therefore, we are going to select one manually. Depending on the available data and the resolution, there are different strategies for selecting good tie-points for geo-coding.

For GCP point problem , I want to make sure that…[Read more]

Hi Ana

1) if you plot the GCP in geographic and in SAR coordinates, the 2 pictures will not be matching, because SAR images are plotted with the range in the vertical direction and azimuth in the horizontal one. If you want to plot the SAR image in geographic coordinates, you can press the “Mean Kml” button (in the GCP selection module): you will…[Read more]