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[Backport 9.9] PROJJSON export: write the approximate inverse of an inverse transformation - #4919

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kbevers merged 1 commit into
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backport-4888-to-9.9
Oct 20, 2026
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kbevers merged 1 commit into
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Backport #4888
Authored by: @CaptainAni187

…mation

InverseTransformation::_exportToJSON() wrote the forward operation's
parameters, so re-importing the PROJJSON of e.g. the second step of
EPSG:4837 lost the inversion. Export the approximate inverse when one
exists, as _exportToWKT() already does.

Fixes #4866
@kbevers
kbevers merged commit de0e4f3 into 9.9 Oct 20, 2026
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@kbevers
kbevers deleted the backport-4888-to-9.9 branch October 20, 2026 15:02
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