Error during merging the change layers

[carolinestudent]

Hello !

I follow this procedure : https://smbyc.github.io/PCA4CD/#2a-generate-the-change-layer-by-component in order to detect change between two images.
Everything works like a charm until the merging process. The window is opened, i can choose the method to merge the change layers and choose the path. However when i click on "ok", i have a error message "error during merging the change layers". I don't know how to solve it…

Thank you for your answer !

[XavierCLL]

Hi Caroline,

Thanks for the report. To fix and understanding what is the error, could you provide more information? OS? version Qgis?, is it possible that you can share a file to replicate the error?

Regards

[carolinestudent]

Hi !

First, thanks for your quick answer :)
I am using QGIS 3.10.2, on "Windows 10 Entreprise", 64bits.
You can find here two images on which i performed the test (https://drive.google.com/drive/folders/1JSm3dnuA0TdPrhbMV3ObLOI-qr10c_t2?usp=sharing)(images were too big to be share with GitHub plateform). For your information I tried it on other images, tiff and jpeg, RGB and graylevel, and I have the same error. I also tried to save them on the server and on a local disk.
If you have any other question, feel free to ask.

Regards

[XavierCLL]

I could not reproduce the error, for me everything works fine. Could you please try to save the result in local device, in different path and filename?

[XavierCLL]

pca4cd.zip

Thanks for the data for test it, I did some changes to show the error, could you please download the zip file and install the plugin manually in Qgis with that changes and repeat the operation? with that changes, the plugin shows the complete error, please send me that error messages, thanks

[carolinestudent]

PCA4CD_error messages.zip

Here are all the error messages I could find ("Impossible d'ouvrir" means "Impossible to open"), I hope that help.

[carolinestudent]

If that help : I looked at the path the error message said "impossible to open...".
The images from PC1 and PC2 are here. As long as the PCA4CD window is open, there is also the file called "pc_2_detection", that I can load in a QGIS project.

[XavierCLL]

pca4cd.zip

Thanks for the data for test it, I did some changes to show the error, could you please download the zip file and install the plugin manually in Qgis with that changes and repeat the operation? with that changes, the plugin shows the complete error, please send me that error messages, thanks

Thank Caroline for the report, but have you tested with the plugin that I send you in the above message?

[carolinestudent]

Yes, the error messages I send you are the one I have with the plugin you send here

[carolinestudent]

After talking with my tutor, I realised I misunderstood the "manually install" part of your message. Here are the error message you were probably looking for :

Traceback (most recent call last):
File "C:/Users/SIEXT5646/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\pca4cd\utils\system_utils.py", line 36, in wrapper
return func(*args, **kwargs)
File "C:/Users/SIEXT5646/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\pca4cd\utils\system_utils.py", line 86, in wrapper
obj_returned = func(*args, **kwargs)
File "C:/Users/SIEXT5646/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\pca4cd\gui\main_analysis_dialog.py", line 328, in do_merge_change_layers
call_code, call_out = getstatusoutput(" ".join(cmd))
File "C:\PROGRA1\QGIS31.10\apps\Python37\lib\subprocess.py", line 567, in getstatusoutput
data = check_output(cmd, shell=True, text=True, stderr=STDOUT)
File "C:\PROGRA1\QGIS31.10\apps\Python37\lib\subprocess.py", line 376, in check_output
**kwargs).stdout
File "C:\PROGRA1\QGIS31.10\apps\Python37\lib\subprocess.py", line 455, in run
stdout, stderr = process.communicate(input, timeout=timeout)
File "C:\PROGRA1\QGIS31.10\apps\Python37\lib\subprocess.py", line 907, in communicate
stdout = self.stdout.read()
File "C:\PROGRA1\QGIS31.10\apps\Python37\lib\codecs.py", line 322, in decode
(result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x82 in position 88: invalid start byte

[XavierCLL]

thank you very much, that's what I was looking for, I will check it

[XavierCLL]

pca4cd.zip

Could you please test this version? (install it manually)

[carolinestudent]

I tested it, it shows the same error message as initially (error during merging the change layers check the QGIS log), and it can't display any error handler window like the one I send you in my previous message.

[XavierCLL]

I've tried to reproduce the problem but it was impossible, then the only way to get new information of the error is through you, sorry for bothering you again, please install this version and run again the test, and copy the message in the new dialog appear when you run the union or intersection process:

pca4cd.zip