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Hello!

I’m trying to process 23 Sentinel-1A images. I’d created folder named ‘S1_DATA’, inside this folder I created ‘SLC’ folder. All of the images I downloaded into ‘SLC’ and unzipped them as I’m working on windows machine.

In ‘Select Dataset’ I chose directory to the parent folder (D:S1_DATA) and the ‘SLC DATA Processing’ window popped up. I…[Read more]

InSAR is by definition relative to a reference point. So, everything is calculated by subtracting the value corresponding to the reference point.
Residual height is the height relative to a reference DEM. Height = external_DEM_height + residual_height.
The deviation of the height estimation depends on many things, as number of images and baselines…[Read more]

Hi Dr. Perissin
Thanks so much for your response.
I have read your papers entitled as “High-Accuracy Urban DEM Using Permanent Scatterers” and “Validation of the Submetric Accuracy of Vertical Positioning of PSs in C-Band”. A few questions have come to me, I’ll appreciate if you answer.
Does “residual height” calculated only by subtracting the…[Read more]

You are on the mountains and you are geocoding your data, not orthorectifying it.
You should orthorectify it instead.

Dear dan,
i met nearly the same problem.
I choose a GCP and set it.
i have checked the DEM file via visualization and it seems fine.
the location of GCP is correct in reflectivity map and in google earth.
However, the geocoding reflectivity map is offset far from the right location.
Please have a look with the attached files.
Thanks,
Regards,
Qingli

the dem was all fine, but the second point helped to load it at a correct position, thank you!
I however noticed that the subset in the “SLC Data Import” wasn’t applied correctly so that confused me a lot 😀 Was probably my fault, I’ll run it again with the correct subset.

1. check that you have a DEM correctly loaded. to check it, you can click “dem visualization” in the frame “preliminary geocoding” in “site processing”. if you get a green flat picture, probably it failed downloading SRTM data (you should have got messages about that). In such a case delete the corresponding SRTM files (SRTM directory in the…[Read more]

Dear all, I use 16 Sentinel-1 SLC scenes (same track) for change detection analysis.
I followed the tutorials I and II for data import. Master selection and coregistration worked well but I keep struggling with the GCPs as the scene is always shifted to a large degree (please see screenshot below).

Do I miss anything that is not contained in…[Read more]

Hi Cecilia,
yes, on the manual you find some explanation, here in particular http://sarproz.com/manual/geocod.html
what you have written is correct if no correlation with temperature was estimated. If on the contrary you did remove a temperature-correlated trend, then you have to tick on the corresponding box to see it, otherwise it is removed…[Read more]

Hello,

It would also be nice to see the jpeg image of the master in your FITTED folder. Could you share that as well? You can upload the jpeg file to wetransfer and paste the link here.

yuxiao

I m having error “cull_points: fewer than minimum points” in 15 images. Im using the version 18-sep-2017, my master image has no rain/snow and and area of 20km radius, also already try orbit and coarse xcorr. co-registration but with the same outcome error

Yes. We closed this issue but forgot to post the solutions here.

There were several errors/messages mentioned in this post. Which one exactly are you getting?

We have fixed all the errors that were discussed in this post, so the first thing is to make sure you have the newest version of sarproz.

Then please let us know which error you are…[Read more]

Did any solution came from this post? Im facing the same problem cull points:fewer than minimum points

It works. Thank you for your assistence.

please check your email

You can choose any parameter for your reference selection: temporal or spatial coherence, amplitude stability index, reflectivity map or whatever.
Or you can even pick it up manually (ticking the corresponding box) depending on other infos/observations (e.g. you want it on the ground, in a stable area or whatever).
InSAR is a differential…[Read more]

I’m sorry, but when I click on “Check online”, another error message is created.

Please, in attachment you will find it.
Thank you.