qgscoordinatetransform_p.cpp: avoid issues when opening projects using PROJ < 7 grid names (fixes #45470) #46918
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…g PROJ < 7 grid names (fixes qgis#45470) Only use proj_coordoperation_is_instantiable() if PROJ networking is enabled. The reason is that proj_coordoperation_is_instantiable() in PROJ < 9.0 does not work properly when a coordinate operation refers to a PROJ < 7 grid name (gtx/gsb) but the user has installed PROJ >= 7 GeoTIFF grids. Cf OSGeo/PROJ#3025. When networking is not enabled, proj_create() will check that all grids are present, so proj_coordoperation_is_instantiable() is not necessary.
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nyalldawson
reviewed
Jan 20, 2022
nyalldawson
approved these changes
Jan 23, 2022
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Only use proj_coordoperation_is_instantiable() if PROJ networking is enabled.
The reason is that proj_coordoperation_is_instantiable() in PROJ < 9.0
does not work properly when a coordinate operation refers to a PROJ < 7 grid name (gtx/gsb)
but the user has installed PROJ >= 7 GeoTIFF grids.
Cf OSGeo/PROJ#3025.
When networking is not enabled, proj_create() will check that all grids are
present, so proj_coordoperation_is_instantiable() is not necessary.
One of that fix or OSGeo/PROJ#3025 are sufficient to fix the issue