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paul replied to the topic Inconsistency of results from different processing steps in the forum Sarproz Forum 6 years, 1 month ago
Hi Daniele,
Thanks for the suggestions.
Paul
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periz replied to the topic Inconsistency of results from different processing steps in the forum Sarproz Forum 6 years, 1 month ago
Hi Paul,
there is a high number of factors that can cause the difference in the results. One of them is the reference point. Then one should check all options you used for processing. Also the outcome of the APS processing plays an important role on the final result. The topic is too broad to be treated here in a single answer. I suggest you to…[Read more] -
paul started the topic Inconsistency of results from different processing steps in the forum Sarproz Forum 6 years, 1 month ago
Hi,
When i am processing Sentinel-1 SLC time series datasets, i encountered with a problem. First, i cropped the study area with 20km radius, and processed the time series with APS (by followed the manual ‘Demo on APS….’). Then i geocoded the result and export into Google earth, and the result is shown as attached. The result shows the…[Read more]
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paul replied to the topic About coregistration, export kml not aligned with google earth in the forum Sarproz Forum 6 years, 1 month ago
Hi Daniele,
Thank you very much for the suggestions. The coregistration works well now.
I did process the external DEM in SAR coordinates, but i did not choose ‘orthorectified’ in data export process, which is important. Besides, the data i am using is Sentinel data.Have a great day,
Paul -
periz replied to the topic About coregistration, export kml not aligned with google earth in the forum Sarproz Forum 6 years, 1 month ago
Hi Paul,
you are missing the most important things:
1. you have to process the external DEM in SAR coordinates
2. you have to choose the “orthorectified” output, in the extended data export
You also miss to tell us which satellite data you are using.
If it is not Sentinel, probably you need to select a GCP manually.
Also, search in the forum,…[Read more] -
paul started the topic About coregistration, export kml not aligned with google earth in the forum Sarproz Forum 6 years, 1 month ago
Hi,
I am currently dealing with SLC time series, and I need to coregister all images to the master image. I follow the step in the manual. After co-registration I opened SITE-PROCESSING- GCP selection – Keep current orbits (auto GCP). Then I applied Coregistration Refinedment (Optional). After all of these, I applied Extended Data Export…[Read more]
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periz replied to the topic Error in choosing AOI in the forum Sarproz Forum 6 years, 1 month ago
Please take the time to read this https://www.sarproz.com/groups/sarproz-group/forum/topic/forum-general-rules/
if you want we understand what you are talking about, paste pictures, logs, messages, all possible information you can find. -
julinor started the topic Error in choosing AOI in the forum Sarproz Forum 6 years, 1 month ago
When I choose the AOI, the Matlab command window show all images are out of the area, but in google earth, the AOI is inside the images area, what’s the problem?
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espiritocz replied to the topic Is heading angle in 'SiteDescription.txt' file +ve w.r.t to geographic north? in the forum Sarproz Forum 6 years, 1 month ago
Hi,
try to draw the angle to the piece of paper. You will realize that the value -129.6 deg is not the heading of the satellite track, while the value from SARPROZ is really heading angle of the satellite from the North (azimuth angle).
best,
M.
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sekhar started the topic Is heading angle in 'SiteDescription.txt' file +ve w.r.t to geographic north? in the forum Sarproz Forum 6 years, 2 months ago
In the SiteDescription.txt file, I have observed a value for ‘AcqHeading’. I believe this as the heading or azimuth angle of the satellite. If so, is it calculated positive with respect to the geographic north?
For a particular S1 dataset acquired in ascending mode (track 72 over Iran), ESA SNAP software shows platform_heading_angle = -129.6 deg…[Read more] -
Yuxiao replied to the topic Coregisteration and Deramping.. in the forum Sarproz Forum 6 years, 2 months ago
TerraSAR stripmap doesn’t require deramping.
If you are working with TerraSAR ScanSAR/TOPS mode, I don’t think sarproz support those formats yet.
YQ
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Yuxiao replied to the topic Coregisteration and Deramping.. in the forum Sarproz Forum 6 years, 2 months ago
For Sentinel, Deramp is automatically done (during coregistration).
yuxiao
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paul replied to the topic Reference point selection in the forum Sarproz Forum 6 years, 2 months ago
Thank you for the information.
It is sentinel-1A data. One interesting thing is that in Site Processing – APS estimation, i generated the graph, and it gives me 25 auto point, and i chose a ‘best’ point with good distribution. Then, i moved to Site Processing -Sparse point processing. When i checked the distribution of the parameters, there is a…[Read more]
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periz replied to the topic Reference point selection in the forum Sarproz Forum 6 years, 2 months ago
By looking at your results again, I notice that the deviation of the estimated height is particularly high: is this Sentinel? If so, the estimated residual height is not very accurate, because the normal baselines are very small. Do not get crazy with the ref point selection.
The suggested ref points are chosen also considering their phase…[Read more] -
paul replied to the topic Reference point selection in the forum Sarproz Forum 6 years, 2 months ago
Thank you so much for the suggestion.
About the reference point choosing, i still have a question. When i read the SARPROZ tutorial ‘Demo: APS Estimation Multitemporal analysis with Sarproz’, it says that best reference point should reflects that both velocity and residual height distribution peak at 0. However, in the Site Processing – APS…[Read more]
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periz replied to the topic Envisat Importing problem in the forum Sarproz Forum 6 years, 2 months ago
hi linweicheng,
sorry for the late answer. You are trying to import Alternating Polarization Envisat images. At the moment this particular Envisat Mode is not supported. We will include it in the near future.
Best -
periz replied to the topic Reference point selection in the forum Sarproz Forum 6 years, 2 months ago
first of all,
velocity and residual height are two different parameters belonging to two different physical characteristics, very different from each other and usually not correlated.
then, even if the majority of radar reflections would be higher than the ground level, still, reflections would be at different height values. Unless you are in an…[Read more] -
paul started the topic Reference point selection in the forum Sarproz Forum 6 years, 2 months ago
A question about choosing reference point:
The image below is the study (urban) area (central Florida) which features with buildings. My question is about choosing reference point. I studied the online material which says integrated residual height and velocity are supposed to be peak at 0 value. However, there might be that majority of PS are on…[Read more]
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linweicheng replied to the topic Envisat Importing problem in the forum Sarproz Forum 6 years, 2 months ago
Sorry that I forgot to upload my attachment……
I’ve also tried to import another Envisat files, but I still met the same problem.
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periz replied to the topic Envisat Importing problem in the forum Sarproz Forum 6 years, 2 months ago
Problems can be solved by doing things step by step from the beginning.
Step 0: read this https://www.sarproz.com/groups/sarproz-group/forum/topic/forum-general-rules/
In particular for what concerns files to include when one encounters errorsbest
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