@bahaamohamadi
Active 4 months, 3 weeks ago-
periz replied to the topic DEM coregistration in the forum Sarproz Forum 9 years, 6 months ago
At this moment the preliminary geocoding options are:
– keeping the orbits as they are
– using an automatic way through an external DEM (which is done just comparing the reflectivity map with the synthetic amplitude)
– using a manual ground control pointSince the software was initially designed for high-quality high-resolution urban-structural…[Read more]
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ivca-cz started the topic DEM coregistration in the forum Sarproz Forum 9 years, 6 months ago
Hello,
is it somehow possible to check the parameters (output) of the DEM coregistration step? Roughly compared with an eye, it is ok (plotting refl. map and synth. amplitude) , however I would like to see the numbers, shifts (for each window) and cross-correlation.
Or, better, is it possible to improve the DEM using an interferogram or more of…[Read more]
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periz replied to the topic APS estimation in the forum Sarproz Forum 9 years, 6 months ago
The stratification option is used to estimate a correlation between APS and elevation (DEM).
If you work in a mountainous area and if you have coherent point at different altitudes, you can use it and it should help compensating the vertical stratification of the APS.DSF is the downsampling factor of the final APS. R is the length of the…[Read more]
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ivca-cz replied to the topic APS estimation in the forum Sarproz Forum 9 years, 6 months ago
Hello,
I would like to ask what are the other parameters in this line:
– stratif – should it be used for ionospheric compensation (in case of L-band data)?
– R and DSF – I understand that it is something like the “smoothness” of the estimated atmosphere; however, why are two parameters and in what units are they?
Thank you,
Ivana -
periz replied to the topic Master scene selection guidelines in the forum Sarproz Forum 9 years, 6 months ago
You are correct.
Sarproz is also doing some further checks. E.g. in the recent releases it tells you explicitly if there was any kind of precipitation in the date chosen as Master. It’s important to avoid any possible source of errors in your Master image.
Also, it would be a good practice to chose the Master image in winter, when the atmospheric…[Read more] -
periz replied to the topic Data import with the AOI at the edge of the scene in the forum Sarproz Forum 9 years, 6 months ago
Hi Ivana
This is the logic behind Sarproz: it firstly estimates the center of the scene, and it gives you an area around the center with a given radius. If you want to move the area, you have to shift the coordinates of the center. Then the extension is chosen either by changing the radius, or by inputting manually the desired final size of your…[Read more] -
bambang started the topic Master scene selection guidelines in the forum Sarproz Forum 9 years, 6 months ago
Dear All,
I have a few questions regarding baseline (temporal and spatial) and master scene selection . What is the best way to select a master in order to get best results? Is there any specific guidelines to get the best interferograms out of the SAR images? From what I’ve read and studied so far, the idea is to minimize the distance between…[Read more]
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bambang started the topic Baseline selection guidelines in the forum Sarproz Forum 9 years, 6 months ago
Dear All,
I have a few questions regarding baseline (temporal and spatial). What is the best way to select a master in order to get best results? Is there any specific guidelines to get the best interferograms out of the SAR images? From what I’ve read and studied so far, the idea is to minimize the distance between master image and other slave…[Read more]
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ivca-cz started the topic Data import with the AOI at the edge of the scene in the forum Sarproz Forum 9 years, 6 months ago
Hello,
I have problems importing the data at the edge of the scene. From the footprints, it seems that my AOI (approx. 200×200 m) is 6.5 km from the northern border of the scene (I know it is not really precise). Once I managed to deal with the northern border, but the crop was shifted too much to the east (probably due to DEM), so I know that…[Read more]
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Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Dear Dr/Mr Periz,
I have followed the same steps as mentioned in http://www.sarproz.com/publish/notes1.pdf. As i am not able to connect to internet (since my system is connected via iisc proxy), i unchecked the function “ext orbits”. thereafter i used set orbits function and read the master and slave images with pre-defined settings. Now i am at…[Read more]
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Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Dear Dr/Mr Periz,
I have followed the same steps as mentioned in http://www.sarproz.com/publish/notes1.pdf. As i am not able to connect to internet (since my system is connected via iisc proxy), i unchecked the function “ext orbits”. thereafter i used set orbits function and read the master and slave images with pre-defined settings. Now i am at…[Read more]
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periz replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
it looks correct, but you have to unpack the files
if anything is not in the right place, the sw will tell you what he searches for -
Yuxiao replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
If you believe you have the correct orbit file, in the same level of your data folder, create a folder by the name of “ORBITS”, and put your orbit file in structures like this:
ORBITS/ENVISAT/yyyymm or
ORBITS/ERS1/yyyy or
ORBITS/ERS2/yyyywhere yyyy is the year and mm is the month of your orbit file
But you must make sure you have the correct one
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Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Dear Sir,
What you said is correct. Yy system is using a (iisc) proxy to connect to internet.
I cannot connect to internet by VPN right now. i will try it later.I am trying to connect to esaftp.dfd.dlr.de, but it is asking the user name and password to retrieve the files. from ESA, i have downloaded the orbit files earlier. can i use the same…[Read more]
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periz replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
the error u sent here shows that the sw cannot connect to the ftp server for downloading orbital data
u have the following options:
a. find a better internet connection (e.g. via a VPN)
b. download manually the data from esaftp.dfd.dlr.de and store them in a folder called G:ORBITS
files have to be organized according to sensor and year…[Read more] -
Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Dear Dr/Mr. Periz,
Please find the file in rar format.
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Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Hi Dr/Mr. periz,
Please see the attached .mat and .log files. please help me to sort out the problem.
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periz replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Hi Vinay,
as you can clearly read in the messages, if you get an error, in order to get assistance you have to send the lasterror.mat and the log files -
Yuxiao replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Can you try to make a new folder, and only put the two envisat into the SLC folder of your new folder, and see what happens?
It’s kind of wired because the name looks like exactly an envisat SLC image.
Besides, what’s the point of putting three pairs of SAR images required in 1991, 1999 and 2010 together? It is pointless.
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Vinay Gaddam replied to the topic IMPORTING THE ENVISAT ASAR DATA in the forum Sarproz Forum 9 years, 6 months ago
Dear Sir/Madam,
Yes, i saw that we need to create two directories for two different sensors. I have created two different directories for ERS and Envisat. Still i am getting the error. Please check the attached for error message. please guide me to convert the .N1 data to IMS or APS.
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