diff options
Diffstat (limited to 'docs/source')
| -rw-r--r-- | docs/source/apps/projinfo.rst | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/docs/source/apps/projinfo.rst b/docs/source/apps/projinfo.rst index 8fbf0546..f6bf9ab0 100644 --- a/docs/source/apps/projinfo.rst +++ b/docs/source/apps/projinfo.rst @@ -224,9 +224,12 @@ The following control parameters can appear in any order: .. versionadded:: 7.0 - "Promote" the CRS(s) to their 3D version. Useful for example when wanting - to transform between a 2D projected CRS with elevations as ellipsoidal - height to a 3D geographic CRS or a compoundCRS. + "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 + ellipsoidal height in metres, using the ellipsoid of the base geodetic CRS. .. option:: --c-ify |