[PROJ] [PROJ 6.0.0] Different behaviors for creating a transformation of type EPSG:9616

[Martin Desruisseaux]

Le 30/04/2019 à 16:19, Even Rouault a écrit :
> For example, if you would do a transformation from a CompoundCRS to
> another CompoundCRS (or a Geographic3D CRS) with both horizontal and
> vertical transformations, there is nothing in ISO:19111 to model the
> composite of both.

Actually this is modeled with PassThroughOperation +
ConcatenatedOperation. So a transformation between two CompoundCRS with
a vertical component would be like below:

    ConcatenatedOperation (a 3D operation in this example)
        PassThroughOperation (a 3D operation in this example)
            coordOperation = the operation on the horizontal component
            modifiedCoordinate = {0, 1}
        PassThroughOperation (a 3D operation in this example)
            coordOperation = the operation on the vertical component
            modifiedCoordinate = 2

Martin


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