Support for transformation methods that are new in EPSG

[Jochem-L]

In the recent database update to EPSG v11.023 and related changes (a33372b) the CRSs and transformations for the island Saba in the Caribbean Netherlands are added. However, 4 new transformations from EPSG are missing. Probably because these use the exact Helmert transformation, or a null grid for the geoid of the height transformation, which are new transformation methods in EPSG. Since PROJ already supports the exact Helmert transformation, I hope it won't be too difficult to add the missing transformations too.

Two missing exact Helmert transformations:

• https://epsg.org/transformation_10646/Saba-to-BES2020-Saba-1.html
• https://epsg.org/transformation_10676/Saba-to-WGS-84-1.html

both using both these two new methods:

• https://epsg.org/coord-operation-method_1133/Coordinate-Frame-rotation-full-matrix-geog2D.html
• https://epsg.org/coord-operation-method_1132/Coordinate-Frame-rotation-full-matrix-geocen.html

 
Two missing height transformations with a null grid for the geoid:

• https://epsg.org/transformation_10657/Saba-to-Saba-height-1.html (3D to 1D)
• https://epsg.org/transformation_10658/Saba-to-Saba-Saba-height-1.html (3D to 2D+1D)

and two corresponding concatenated operations:

• https://epsg.org/concatenated-operation_10675/BES2020-to-Saba-height-1.html (3D to 1D)
• https://epsg.org/concatenated-operation_?????/BES2020-to-Saba-Saba-height-1.html (3D to 2D+1D), still waiting for addition in EPSG

using one of these two new methods:

• https://epsg.org/coord-operation-method_1136/Geographic3D-to-GravityRelatedHeight.html (3D to 1D)
• https://epsg.org/coord-operation-method_1131/Geog3D-to-Geog2D-GravityRelatedHeight.html (3D to 2D+1D)

[rouault]

Support for the Geographic3D to GravityRelated Height and Geog3D to Geog2D GravityRelated Height had already been added a few days ago in master

Support for the Coordinate Frame Rotation Full matrix added in #4348

You'll have to get back to IOGP about how concatenated operation EPSG:10675 is defined. Currently it is too messy and PROJ rejects it due to its consistency checks: "Note that concatenated operation EPSG:10675 is not imported because https://epsg.org/concatenated-operation_10675/BES2020-to-Saba-height-1.html is ill defined in EPSG 11.023 due to first step referencing BES2020 Saba geographic 2D (EPSG:10639), but source CRS of concatenated operation referencing BES2020 Saba geographic 3D (EPSG:10638)"

[Jochem-L]

That is very quick. Many thanks!

I'll contact EPSG about definition of the concatenated operations.