Best

I am processing change detection for image pairs. I am using Normalization. I would like the color scale to be -1 / 1 because I think Sarproz is setting to Min/Max when I use Stretch -> None (-0.6 / 0.6). If I use Stretch -> Absolute Value I get an error:

Undefined function or variable ‘d’

Am I doing something wrong here?

I have good news and bad news…

Good news – Using “orbits only” coregistration parameter not only made coregistration much faster but also corrected the failed interferograms from before, excelent!

Bad news: There is still ramping, mostly in azimuth, and strange results.

A – First the ramping pairs:

B – Now the…[Read more]

I have sent you the site log file to the provided email address.

In the meantime I will check out “orbits only” coregistration.

Thanks!

Then I changed to MST graph I processed Interferograms. There still seems to be a lot of problems…

Ramping in numerous images, here…[Read more]

The only coregistration errors I got were S1 Stitching erros, which I inquired in another thread and was told to ignore. I will try coregistering the dataset again and see if there are any errors on those…[Read more]

Is there any way to better align exported points with Google Earth?

Here is an example:

I followed the tutorial by Mr. Yuxiao very closely. Results seem much better than before, but there are still a couple of anomalies.

First, the resulting points from 0.85 thresh amp. stab:

Coherence Before:

Graph Coherence;

Parameters Plot…

Heights:

Displacement:

Coherence after weighting (0.8; 0.95)

Coherence…[Read more]

Here are examples:

Here are APS parameters:

Maybe this time series can provide some insight:

Thank you!

I am reprocessing the dataset with 135 images (from 60 previous), I will post the results soon.

Thank you

I am processing 135 Sentinel 1 images. During Slave extraction I get the following error on many images:

S1_STITCHING(): YOUR FIRST 6 LINES FOR INTERFs INCLUDING IMAGE 20170201 WILL BE TOTALLY NOISY DUE TO A FAIL IN ALIGNMENT!
Extract Slave from a different look: date 20170201…Done.

Is this a problem or can I ignore it?

Thank you

I have been experimenting with a stack of 60+ S1 images from Jan 2017 to Dec 2017. I have followed the tutorials, especially the notes by Mr. Timo Balz, and have completed all the steps with the recommended parameters.

I exported the def. trend to analyse the velocities of the points, and some of them have extreme results (40-50mm per…[Read more]

For Long term change analysis, does this in any way result in the loss of information? Does it facilitate comparison between images taken in different periods? What benefit is there leaving it off?

The tutorials available on the site all seem to have…[Read more]

I am processing a very large volume of change detection (60+ S1 images), and exporting as KML for later viewing in GE. The problem is GE opens the output every time after processing, is there any way I can stop it?

The all zero error seems to be due to ocean, as the satellite data does cover some coastal area.

Thanks for the help.

sel_par: neither file D:SNAPBejaBeja_SARSLC2017RESULTSDemSynt nor D:SNAPBejaBeja_SARSLC2017RESULTSDemSynt.mat found

files D:SNAPBejaBeja_SARSLC2017RESULTSDemSynt and D:SNAPBejaBeja_SARSLC2017RESULTSDemSynt.mat not found

leggi_srtm: Warning! file D:SNAPBejaBeja_SARSLC2017..SRTMN05W033.hgt is all zeros!!…[Read more]

Did you follow the tutorials available on the site? If you want to select a small area, go:

1. Select Area -> View Refl. Map

2. Now zoom in to the area of interest in the new image window

3. Once you have it in the field of view, press the Grab Area button

4. The values should be automatically input in the boxes, now press Load

I am currently working with 60 Sentinel 1 images taken in 2017. I am processing change detection over a very large area. Orthorectification does a great job but there is still a slight shift between SAR results and Google Earth, in some places as much as 100+ meters. This is especially noticeable over lakes or center pivot irrigation…[Read more]