SARPROZ ©

Hello ogokce,

A new version of sarproz is available and please try to give it a test. The bug should be gone.

Regards,
yuxiao

Hello ogokce,

I believe what you are seeing there is a bug as we are working on some new updates in the change detection module. We will work on that and let you know when the bug is fixed. Meanwhile, I am glad to hear that you can still use the other way around to solve it.

I will keep you updated.

Yours,
yuxiao

Meanwhile, we are working on switching to a more stable source for downloading S1 orbital files. I would expect to have the new source added to the software soon.

yuxiao

Hello,

Sorry for missing out this post.

At this moment, if your university blocks the FTP protocol, there is not much you can do.

However, we are now deciding to abandon the FTP server in a future release. Please know that I am now working on this issue (among many other things) and I expect to finish this module a couple of weeks at most.…[Read more]

Hello Jaroslav,

As long as you have precise or restitute orbits, you can use the “orbit only” method for coregistration.

Meanwhile, I am working on a new update in downloading new orbital files to make the process more stable and up-to-date.

yuxiao

Hello,

This is a permission issue under Windows that prevented the creation of a symbolic link.

I have just fixed this bug. You should be able to carry on when you see and update to a new version of the software.

Meanwhile, with the current version of sarproz, one thing you can try is to run it as administrator. It should solve the permission…[Read more]

Hello,

I am aware of your issue now and will post you an update as soon as I have the bug fixed.

yuxiao

Hello UD,

Currently, due to a few considerations, we store sentinel orbit files on the FTP server. If your FTP protocol is blocked and cannot access the FTP, you have to manually download the corresponding dates and put it into corresponding folders.

If you do not prefer to do so, you can just carry on. In coregistration, just use the default…[Read more]

Hello,

The coregistration accuracy is independent of footprint shift.

A simple-way-to-think for how-satellite-works is that it scans along a swath. The swath has a fixed “width” (but we call it range) but as you scan along you can have a long “length” (we call it azimuth).

For the purpose of distributing products to the public, one needs to…[Read more]

Hello Jaroslav,

If this error happens again, I have a temporary solution for you.

If you tick “Debug Message”, you will be able to see which date does this error occur exactly. Then you can manually download the orbital files for this date. The instruction could be found…[Read more]

Hello Jaroslav,

This looks like an orbital file downloading failure to me. I believe that clicking on “Set Orbits” again should have your issue resolved by now. Could you please try that?

yuxiao

Could you please also check ORBITS/S1B/2017/10/aux_resorb ? (S1B)

The log shows there’s something wrong with the orbit file in October. It is better we check it well.

Thanks!

yuxiao

Hello Jaroslav,

It looks to me that one downloaded orbit is corrupted. Can you help me confirm that?

You can go to ORBITS/S1A/2017/10/aux_resorb and paste the filenames here.

If my inference is true, we will go from there.

yuxiao

We encourage you to ask as many questions as possible.

I will wait for Dr. Perissin on this question, but I think it is only a very simple geometry that you could draw yourself.

I append here a 2D (horizontal and vertical) decomposition here:

https://www.dropbox.com/s/kftq8qf8nhkrp87/Practice1.png?dl=0

Now, with only one pass, it is…[Read more]

For each image, go to the folder and look for YOUR_DATA/EXT/yyyymmdd/yyyymmdd.meta.mat .

You can load this mat file, and one field is called doppler. When you read it, it contains all the information you will need for calculating the Doppler centroid: the coefficients, time tag, etc. The Doppler centroid can be then calculated for each image.

yuxiao

Just to note here that this issue has been solved.

For other’s reference, when one is importing SLC data:
1. Check if the input latitude/longitude is consistent with the MasterArea.kml (that is generated by clicking “View”);
2. Check if the extracted Master image is corresponding to the MasterArea.kml (you can see the master image by “View…[Read more]

Hello Alicia,

I suggest we set up a remote session for me to take a look at your dataset. Are you familiar with using teamviewer?

In this way, we could quickly go over your dataset and diagnose the problem.

If you have teamviewer installed, then email me at qyuxiao@sarproz.com so that I can quickly connect and see the dataset.

yuxiao

Hello Alicia,

I would check the following as a start: the extracted master and slave images. In the attached file you showed me, I can only see the jpeg of master image. Could you also show me a few examples of the slave images? You can find the corresponding jpeg images in the EXT/yyyymmdd folder.

I can see that the master area extracted is…[Read more]

Just to note for other’s reference, this problem has been solved.

It appears that one of the SLC folders was corrupted and does not contain the xml file that is required for reading in meta data.

In the next version of sarproz we will add a folder integrity check for Sentinel Tops folder inside the SLC folder for data import purpose.