SARPROZ ©

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]

yeah I was wrong about DEM alignment. everything was ok with DEM

Just a couple of comments to close this topic

Ivana: thanks to your case I inserted a couple of minor corrections to provide a better match between the SAR and geographic coordinates in the Master area selection, SLC module. Pcodes are online, compiled version for windows is uploading, and the linux compiled version will be available in the next…[Read more]

The height is considered. However, what is used is the height coming with the SAR image, which is usually 1 value for the whole image. We can work at improving it. But we would need to get 2 sample images in which the shift is present and significant.
Ivana, could you share 2 images out of your case?

Hello,

regarding the out-of-area crop (the first question), I have the same experience. It seems to me that probably when reading the dataset, no heights are considered, and the crop is then moved to east/west (different for asc/desc). It helps to crop a bigger area or just put shifted geo coordinates. In the next steps (GCP, geocoding etc.), the…[Read more]

Hi Farnoosh,
some comments below:

1. in the software manual, you can check how the software can ingest external DEMs at the paragraph “1.4.2.1. External DEM Selection”
2. probably the easiest way for you is to create a geotiff DEM (with an other software) and import it in Sarproz
3. anyway Sarproz can manage TDX bistatic pairs and respective…[Read more]

Dear Daniele,

thank you for fast response!
I will test it now (Manage Version shows the last to be from 27-Apr, is it the new one?).
The topic of AOI is subsidence of buildings – three weeks ago a dangerous movement was (accidentally) detected over one building. With this dataset we may detect this movement in similar way you did for Hong-Kong,…[Read more]

Milan:
the data were stored in a flipped format. Now the data extractor has been generalized and the image has the right orientation.
I saw the big orbital data errors. However, we did not test the phase flattening yet.
Let me know if you still get big ramps. If so, we’ll also generalize an orbit correction.
Pcodes and compiled version for windows…[Read more]

For those who cannot use the “Manage Version” module to download the update, I paste here temporary links for direct download:

– pcodes: http://we.tl/H5B9HSLNfZ
– compiled for linux: http://we.tl/wW9CEUMhnY
– compiled for windows: http://we.tl/FO7E90lyZK