Documentation on how to use the Coregistration plugin in QGIS

[dimplejaiin]

@XavierCLL @jakimowb I have tested the plugin in QGIS version 3.28.4-Firenze using the Automated Local Co-Registration tool and received an output. However, I am having difficulty interpreting the output and it seems that the output is not properly coregistered with the target image. It would be greatly appreciated if documentation or guidelines could be provided to assist with using the plugin and interpreting the results.

Thank You!

[XavierCLL]

Hi @dimplejaiin

The Automated Local Co-Registration requires more adjustments in the options if you want optimal results, "local" here means that the process tries to co-registrate by segments (windows) of your input image. In general, I recommend "global" when your image presents a general shift (whole image) with respect to the reference image, and it also is simpler to setup respect to local option.

This to co-registration option the plugin uses the Arosics tool for process the image, you can find more information Arosics, also here the expert about the differences of local and global is Daniel (@danschef) maybe he could explain in detail that.

Regards
Xavier

[dimplejaiin]

Thank You for your response @XavierCLL

Based on your suggestion, I used the global tool on two individual bands. However, I am experiencing difficulty interpreting the output as it appears that the reference image and output image are not properly coregistered. Additionally, the output image contains a significant amount of no data pixels. I am wondering if these can be utilised as tie points and, if so, would greatly appreciate your guidance on how to proceed.

Thank You!

[danschef]

@dimplejaiin This sounds like an issue which is only related to your specific input data and not to the implementation of the QGIS plugin itself. I recommend to open an issue here including additional information about how you called AROSICS and probably screenshots from your input images.

[dimplejaiin]

Hi @danschef

Sure, and Thanks for your response.