I did some investigating. The error is thrown here
// create a target CS so that the dimensions not contemplated in the
source CS
// are copied over (think Z or M with a 2d CRS)
int targetCSDim = targetDim + (sequence.getDimension() - sourceDim);
CoordinateSequence result = csFactory.create(sequence.size(),
targetCSDim);
see
https://github.com/geotools/geotools/blob/master/modules/library/api/src/main/java/org/geotools/geometry/jts/DefaultCoordinateSequenceTransformer.java#L90
`targetCSDim` is 4 because:
1. `sequence.getDimension()` delegates to its default implementation
`CoordinateArraySequence` which always returns 3, regardless of its content.
2. `sourceDim` is 2
3. `targetDim' is 3
4. 3 + 3 - 2 = 4
`csFactory.create` delegates to `CoordinateArraySequenceFactory` which does
the following check
if (dimension > 3)
throw new IllegalArgumentException("dimension must be <= 3");
Am I using the API wrong?
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