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Yuxiao replied to the topic Unable to read Sentinel precise orbits downloaded manually in the forum Sarproz Forum 6 years, 1 month ago
In your data:
20161007T051857_20161007T051924 means the data is taken at 2016-10-07 05:18~05:19 UTC.
In your orbit:
20161007T112543_V20160916T225943_20160918T005943 means the orbits cover the period from 2016-09-16 22:59 UTC to 2016-09-18 00:59 UTC. 20161007 merely means the date that this orbit file is released (usually 21 days after the data…[Read more]
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venkatadripattela replied to the topic Unable to read Sentinel precise orbits downloaded manually in the forum Sarproz Forum 6 years, 1 month ago
Dear Yuxiao,
I tried “set orbits” after placing manually downloaded orbits in corresponding folder. Please find the attachment of screen shots below. Did I download the wrong file ? For S1B product S1B_IW_SLC__1SDV_20161007T051857_20161007T051924_002396_0040C9_0BD2.zip
I downloaded precise orbit…[Read more] -
Yuxiao replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
If it is a common shift for ALL the points, then please check well your reference point (assuming your reflectivity map is geocoded correctly).
If the shifts for different points are different, then, as discussed above, it is highly likely a height estimation error issue. The right approach should be to estimate the point height as good as…[Read more]
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Yuxiao replied to the topic Unable to read Sentinel precise orbits downloaded manually in the forum Sarproz Forum 6 years, 1 month ago
Did you “set orbits” again after you downloaded the orbits manually and placed in corresponding folders?
Please note that S1A(S1B) means either ORBITS/S1A/2018/05/…. or ORBITS/S1B/2019/12/….
If it still does not work please print-screen me the path of the orbits.
Q
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venera replied to the topic Sentinel 1 import in the forum Sarproz Forum 6 years, 1 month ago
UPD. Problem is solved.
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periz replied to the topic different color in resampled version of KML scattered in the forum Sarproz Forum 6 years, 1 month ago
Hi Mahtab,
colors are the same, but you cannot compare a continuous image with black-circled dots. The effect is obviously slightly different. Moreover, the two results are differently downsampled by googleearth. you have to look at them locally at the maximum resolution. there you will see that colors are the same
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mahtab started the topic different color in resampled version of KML scattered in the forum Sarproz Forum 6 years, 1 month ago
Hello
I’m exporting a resampled version of my KML result. The strange thing is that although minimum and maximum values are equal in both outputs, the colors are not same as you can see in the attached files.
Could you please give me the reason and solution?
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venera started the topic Sentinel 1 import in the forum Sarproz Forum 6 years, 1 month ago
Hi!
I am processing 39 Sentinel images and after set orbit step I checked the footprint of subswath. After I changed the subwath and Google Earth showing me same footprint for different subwaths.
Then after master extraction software gives me an error with slave extraction.
Could you please have a look what I am doing wrong?
Thanks,
Venera -
antig replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
thanks again periz for good paper
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periz replied to the topic spars point selection in the forum Sarproz Forum 6 years, 1 month ago
if you select all pixels in an area, all those pixels will be treated and exported.
you do not want all pixels in that area
you want all pixels with some additional thresholds, like temporal coherence higher than a value or whatever.
to apply multiple thresholds, use the “save selection” function in “scatter…[Read more] -
venkatadripattela started the topic Unable to read Sentinel precise orbits downloaded manually in the forum Sarproz Forum 6 years, 1 month ago
Hello,
I am getting error in downloading Sentinel precise orbits. So I followed the steps from link below.
https://www.sarproz.com/groups/sarproz-group/forum/topic/sentinel-orbits-in-sarproz/After Downloading Precise orbits from https://qc.sentinel1.eo.esa.int/ and placed in ORBITS/S1A(S1B)/yyyy/mm/aux_poeorb(aux_resorb)/*.EOF. aux_poeorb I…[Read more]
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mohsen-ebrahimian started the topic spars point selection in the forum Sarproz Forum 6 years, 1 month ago
hello
after spars point processing, i need a kmz or csv file Contains spars points that Are located only in a Specific polygon , because Results of the Specific areas are more important for me . so i made a polygon in custom mask generation and loaded it . but in spars data export step, the kmz file that was created contained all sampled points…[Read more] -
antig replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
Does SarProz have opputurnity to choose whitch plane to orthorectify exported points. Issue is that Firstly I geolocate refelctivity map. Ussualy it fits good in Google earh. After point protsessing, using H estimator for purpses that you are talked, points dont fit to reflectivity map. I have to move them by hand right place. So exlude that move…[Read more]
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Yuxiao replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
Let me add a little bit more of my own understanding.
First of all, the shift is caused by the fact that the height of that point you try to estimate (using PSI) is not corrected. You said it is DEM error, but the better saying should be “height estimation error”.
In Sentinel-1 data, the normal baseline is very small, hence the height ambiguity…[Read more]
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antig replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
sry I dont understood correctly. Does H estimation in urban areas are nessery or not? If ext. Dem is ok.
I agree that in SarProz I can do everything. But I want to do something meaningful, because I think it is not a toy.
So I have to know that philosophy is behindthose buttons that I push. -
periz replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
this is an other good reading: https://engineering.purdue.edu/~perissin/CE697_insar/MTINSAR.pdf
avoiding estimating the DEM error can cause a wrong movement estimation (because the topographic phase acts as noise on the phase values).
but you are right, Sentinel has short normal baselines, and if your DEM is good, you can assume most of the…[Read more] -
antig replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
Thank You. It was very fruitful reading. If I understood correctly the positional shift caused mainly by DEM error.
In Sarproz displacement calculation totorials mainly H is also estimated. I deal with Sentinel data mainly. According to my knowledge, Sentinel is not very good dataset for dem estimation. So, does H estimation have some other…[Read more] -
periz replied to the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
The short answer is: you need to take a course on the subject.
The longer answer: read this https://engineering.purdue.edu/~perissin/CE597_radar_remote_sensing/10336.pdf
and also all material you find on this website, including the papers here: https://www.sarproz.com/scientific-publications/
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antig started the topic orthorectifcation of points export? in the forum Sarproz Forum 6 years, 1 month ago
Hi everybody
I have a problem with point position after export.
If I calculate points with small area method using height estimation, then points are not in right place after export (positon.png). Background reflectivity map is also orthorectified. In Geocoding window is everything ok. Points are center of reflected areas like they should be. But…[Read more] -
periz replied to the topic Sentinel-1 interferograms processing problem in the forum Sarproz Forum 6 years, 1 month ago
1. please read the forum rules about what to include in your post
2. as the message says, ur RAM is too low
3 possible workaround: do not generate jpeg files (to do this check the related option in the advanced parameters) - Load More