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Diffstat (limited to 'docs/source/apps/projinfo.rst')
| -rw-r--r-- | docs/source/apps/projinfo.rst | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/docs/source/apps/projinfo.rst b/docs/source/apps/projinfo.rst index 04ee7578..a19afa5b 100644 --- a/docs/source/apps/projinfo.rst +++ b/docs/source/apps/projinfo.rst @@ -300,12 +300,12 @@ The following control parameters can appear in any order: .. versionadded:: 6.3 - "Promote" the CRS(s) to their 3D version. In the context of researching - available coordinate transformations, explicitly specifying this option is - not necessary, because when one of the source or target CRS has a vertical - component but not the other one, the one that has no vertical component is - automatically promoted to a 3D version, where its vertical axis is the + "Promote" 2D CRS(s) to their 3D version, where the vertical axis is the ellipsoidal height in metres, using the ellipsoid of the base geodetic CRS. + Depending on PROJ versions and the exact nature of the CRS involved, + especially before PROJ 9.1, a mix of 2D and 3D CRS could lead to 2D or 3D + transformations. Starting with PROJ 9.1, both CRS need to be 3D for vertical + transformation to possibly happen. .. option:: --output-id=AUTH:NAME |