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Yuxiao replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 6 months ago
Hi Matus,
Sorry for the late reply..
Since the coregistration will rely on the area and quality of overlapping parts between bursts, it is always generally a good idea to extract a bigger area (especially on range direction) so to ensure there are enough overlapping parts for fine-coregistration.
Then, since the fine-coregistration will rely…[Read more]
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Yuxiao replied to the topic Sentinel-1 master extraction in the forum Sarproz Forum 8 years, 6 months ago
Hi Dora,
The link is fine. I am going to run you data in a while and then let you know!
Yuxiao
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dora replied to the topic Sentinel-1 master extraction in the forum Sarproz Forum 8 years, 6 months ago
Hi Yuxiao,
I’m sorry for the delay, I’m having trouble with the ftp. Please let me know if you can access the image through this link instead: https://www.dropbox.com/sh/u8gekioz09t9ynf/AABb2ecF1XYTu7sutZqEQflya?dl=0
Thanks,
Dora -
periz replied to the topic Coregistration– in the forum Sarproz Forum 8 years, 6 months ago
Hi Sg,
– here http://sarproz.com/manual/slc_data_module.html you can read that you can update your dataset, trying to coregister again the failed images (be careful, when you press buttons always read carefully the messages given by the sw. in particular, if you do not check the “update” option you may overwrite your work if you press randomly…[Read more] -
sgishwar started the topic Coregistration– in the forum Sarproz Forum 8 years, 6 months ago
If co-reg. fails for some images then does it mean that those images will not contribute anything during the process and are to be discarded before processing further?
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Yuxiao replied to the topic Ramp in the forum Sarproz Forum 8 years, 6 months ago
Hi Dear Nader,
Yes first we should at least see the fringes.
In the second place, as said in the previous topic, It would be great for you to send me you master image’s file name (or date, but file name preferred), the image pairs (same as master image) that has ramps, and the range (coordinates, samples and lines) you set for your area so t…[Read more]
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Yuxiao replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Ivana,
Thanks for the info! I will take a look into the data and let you know!
Yours,
Yuxiao -
periz replied to the topic Ramp in the forum Sarproz Forum 8 years, 7 months ago
hi Nader,
as mentioned by Yuxiao in a previous topic, there could be several reasons for having a ramp on an interferogram.
E.g. orbital inaccuracies, coregistration problems, atmospheric artifacts and so on.
Yuxiao is checking it because the Sentinel processing still deserves some extra care.
Generally speaking, forgetting for a moment that you…[Read more] -
bahari started the topic Ramp in the forum Sarproz Forum 8 years, 7 months ago
Dear all,
I am processing sentinel data, I see the RAMP effect in the interferograms. How can I remove this effect? can I use “Residual fringes estimation and removal” or I can remove it in next steps e.g., in ‘Multi image InSAR processing”.
Please help me.!thank you
Nader -
bahari replied to the topic DEM in the forum Sarproz Forum 8 years, 7 months ago
Dear dan,
Thank you for your help, I downloaded manually the SRTM hgt files (for some of them with 0 values) and put them in SRTM directory.
Now it seems the DEM visualization is ok.regards
Nader -
periz replied to the topic DEM in the forum Sarproz Forum 8 years, 7 months ago
Hi Nader,
in your picture you can see 2 different types of NaNs (not-a-number):
a. some spots here and there (usually in areas of steep slopes): they correspond to SRTM missing data. Sarproz interpolates those values when the DEM in SAR coordinates is generated. You can check the result after your process it, by plotting it with the “view…[Read more] -
bahari started the topic DEM in the forum Sarproz Forum 8 years, 7 months ago
Dear All,
In site processing I use SRTM, but in visualization of DEM I see the area of processing with dummy values of DEM.
I don’t know this is a main problem or not. If yes, how can I solve this problem. please find in attachment the DEM Visualization.Best regards,
Nader -
matusbakon replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Are there any general advices while processing Sentinel-1 IW SLC? Like extracting a bigger area first? I’ve seen hints for increasing the area size by 1500 pixels, etc.
Many thanks to you Yuxiao,
Cheers
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ivca-cz replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Yuxiao,
I am sending all the filenames (zipped) I use. As master, I am using 20150703, IW2, center 50.54, 13.5, radius 20 km.
Using MST as with long temp baselines, it gets heavily decorrelated.
So, these are the pairs with phase ramps (is it possible, that the phase ramps are only in the “upper” part of the interferograms?)
20151124 -…[Read more]
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Yuxiao replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Ivana and Matus,
The phase ramps within the interferograms is usually a case-by-case issue and we do need to take a look case-by-case, since there are a number of issues that might cause the ramp.
It would be the best for you to send me you master image’s file name (or date, but file name preferred), the image pairs (same as master image)…[Read more]
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Yuxiao replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Ivana and Matus,
The phase ramps within the interferograms is usually a case-by-case issue and we do need to take a look case-by-case, since there are a number of issues that might cause the ramp.
It would be the best for you to send me you master image’s file name (or date, but file name preferred), the image pairs (same as master image)…[Read more]
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Yuxiao replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Ivana and Matus,
The phase ramps within the interferograms is usually a case-by-case issue and we do need to take a look case-by-case, since there are a number of issues that might cause the ramp.
It would be the best for you to send me you <u>master image’s file name (or date, but file name preferred)</u>, <u>the image pairs (same as master…[Read more]
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Yuxiao replied to the topic Slaves Extraction in the forum Sarproz Forum 8 years, 7 months ago
Hi Dear Qingli,
From the log I can see that you’re using the pcodes from August 29th last year.
A lot of things went done since then…
One way to fix the bug is update the pcodes. Then we will see if the bug persists.
Happy Monkey New Year!
Yuxiao
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matusbakon replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
same experience here!
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ivca-cz replied to the topic Sentinel-1 SLC IW intensity grayed out, corregistration not possible in the forum Sarproz Forum 8 years, 7 months ago
Hi Yuxiao,
thank you, it is ok now. And the December 2015 interferograms are the most coherent ones (for my AOI)!
Unfortunately, I can still see few phase ramps within the interferograms (about 3 in 30-40 interferograms). It seems that this did not improve since October. Do you need the test data?
Thank you again, Ivana
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