No there's no such option but you could easily add one to the coordinate
operation factory context
and when set relax checks about res.empty() likely at
https://github.com/OSGeo/PROJ/blob/8072ad6aae7a11f605c04a7068bd295404705fe0/src/iso19111/operation/coordinateoperationfactory.cpp#L4161
,
https://github.com/OSGeo/PROJ/blob/8072ad6aae7a11f605c04a7068bd295404705fe0/src/iso19111/operation/coordinateoperationfactory.cpp#L4207
and
https://github.com/OSGeo/PROJ/blob/8072ad6aae7a11f605c04a7068bd295404705fe0/src/iso19111/operation/coordinateoperationfactory.cpp#L4228
Le 19/03/2026 à 21:31, Javier Jimenez Shaw via PROJ a écrit :
Hi
There is a "feature" in PROJ that is sometimes inconvenient: if there
is a direct transformation from A to B, it is not searching for better
options.
That can be really annoying in some cases, and confusing as well.
Is there any way to "disable" it? something in the context? an
environment variable?
Example:
If I transform from WGS84 to NAD83(2011) it is going to use the
transformation
https://epsg.org/transformation_9774/NAD83-2011-to-WGS-84-1.html, that
is a no-op, with 2m accuracy.
However from WGS84 to NAD83(2011)+NAVD88 it is taking a more
complicated transformation for the horizontal values. That is very
confusing. It happens in other situations (that of course I cannot
remember now).
I understand that changing the current behaviour could be to big (we
can discuss if it makes sense or not), but having a way to disable
that "optimization" would be great.
Thank you
Cheers
Javier.
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