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GFZ / arosics

AROSICS - Automated and Robust Open-Source Image Co-Registration Software
https://git.gfz-potsdam.de/danschef/arosics
Apache License 2.0
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Landsat products projection problem in southern hemisphere #6

Closed shahriar49 closed 2 years ago

shahriar49 commented 2 years ago

Description

I tried to co-register a Landsat-8 collection-2 level-2 surface reflectance image to a Sentinel-2 MSI level-2 image, both taken in South Africa via Google Earth Engine. But I got this error:

RuntimeError: Input projections are not equal. Different projections are currently not supported. Got WGS 84 / UTM zone 36S vs. WGS 84 / UTM zone 36N.

I found that while GEE Sentinel-2 products have proper UTM zone designation for northern or southern hemisphere, the GEE Landsat-8 collection surface reflectance products are all designated by UTM north projections even if the scene is for the southern hemisphere (see https://gis.stackexchange.com/questions/269004/wrong-projection-from-landsat-8-surface-reflectance-collection-in-gee). Although they modified the false_northing parameter to place the image correctly on display, but it makes the AROSICS program to fault.

P.S. I checked Landsat 8 TOA products and it had the same problem.

shahriar49 commented 2 years ago

I did the reprojection first and the problem solved. Sorry for raising an unnecessary issue!

danschef commented 2 years ago

Well, the only thing I could do here is to somehow read the false-northing parameter to correct for the hemisphere. But I have to check if that makes sense and can be implemented robustly.

The output of gdalinfo /path/to/file/with/wrong/hemishere might help with that.

danschef commented 2 years ago

However, I will soon implement an automatic reprojection in case the projection of the input images are unequal. See here.