Hi Tyler,

And thanks for your feedback.

Your issue is likely related to the issue here:
https://github.com/OSGeo/grass/issues/1872
Given that this obviously has wider consequences I took the liberty to elevate 
priority of the issue as a blocker…

A workaround will be available in GRASS 7.8.7 (or GRASS 8.0). Will see if it is 
possible to solve this temporarily via packaging… But a proper fix is needed.

Cheers
Stefan



From: grass-dev <grass-dev-boun...@lists.osgeo.org> On Behalf Of Tyler D. 
Rudolph
Sent: fredag 29. oktober 2021 17:49
To: grass-dev@lists.osgeo.org
Subject: [GRASS-dev] GRASS 'Unable to load GDAL library' when processing linked 
maps

I get an error message when I try to run the following on a linked 
'GDAL-supported pseudo-GRASS raster map':

> r.external input=myraster.tif output=myraster
> r.null map=myraster setnull=0
ERROR: Unable to load GDAL library

When I run the same on a GRASS raster map, however, no error is triggered:

> r.in.gdal input=myraster.tif output=myraster
> r.null map=myraster setnull=0
100%

Is this expected behaviour? If so, and drawing such errors is unavoidable, then 
I will cease to use linked maps in future. However, in the interest of limiting 
storage space requirements, I find r.external and v.external to be effective 
ways of managing existing data without the need for duplication, so if avoiding 
such errors is feasible, I suggest this would be a valuable feature to consider 
for future releases.




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