Transformation: no longer do vertical trasnformation when doing compound CRS to 2D CRS / add --3d to cs2cs

Previously, when computing transformation between a compound CRS and a
geographic/projected 2D CRS, the behaviour was similar to implicitly
promoting the 2D CRS to 3D CRS in the pipeline computation logic, hence
a geoid model could be applied. But note that when doing a geographic 3D
to geographic/projected 2D CRS transformation, we *did* not do this implicit
promotion and if a Helmert transformation existed between the datums, it
was done only in 2D. So this is a bit inconsistent and triggered the
comment in https://github.com/OSGeo/PROJ/issues/2318#issuecomment-1068924513

With this commit, we no longer do any vertical transformation when doing
compound CRS to the 2D CRS, but just take the transformation of the
horizontal part of the compound CRS to the 2D CRS.
Said otherwise, NAD83+NAVD88 to NAD83 will no longer lead to the
application of the geoid model. Unless you explicitly ask for the
promotion NAD83 to 3D.

Also related, in https://github.com/OSGeo/PROJ/issues/1563 that went to 6.3.0,
I changed cs2cs to automatically promote to 3D the CRS as soon as one of
them was compound, for the sake of being consistent with the past
behaviour. But it then becomes difficult to predict PROJ behaviour
depending on which level of it you consider...
This commit undoes that and adds an explicit --3d switch to cs2cs, similarly to
projinfo, to ask for promotion.

Other bug fix found in the process, when using legacy syntax, +init=epsg:4979,
(WGS 84 3D), the resulting CRS was 2D and not 3D.

1 files changed, 1 insertions, 1 deletions

diff --git a/test/unit/test_network.cpp b/test/unit/test_network.cpp
index f8b70ae8..73265008 100644
--- a/test/unit/test_network.cpp
+++ b/test/unit/test_network.cpp
@@ -1146,7 +1146,7 @@ TEST(networking, curl_vgridshift) {
 
     // WGS84 to EGM2008 height. Using egm08_25.tif
     auto P =
-        proj_create_crs_to_crs(ctx, "EPSG:4326", "EPSG:4326+3855", nullptr);
+        proj_create_crs_to_crs(ctx, "EPSG:4979", "EPSG:4326+3855", nullptr);
     ASSERT_NE(P, nullptr);
 
     PJ_COORD c;