| There is no "Geographic 3D to ellipsoidal height" operation because |
| such separation is illegal according ISO 19111. However Apache SIS |
| may need to perform such separation anyway in some circumstances, |
| but it should be only in contexts where SIS can keep trace of other |
| dimensions in an "interpolation CRS". This happen in the following |
| method: |
| |
| CoordinateOperationFinder.createOperationStep(GeodeticCRS, VerticalCRS) |
| |
| The above method does inline the work of what would have been a |
| "Geographic 3D to ellipsoidal height" operation if it existed. |
| The algorithm is the same than the one in Geographic3Dto2D.java: |
| just drop dimensions with a non-square matrix like below; don't |
| do unit conversion at this place (unit conversions are the job |
| of another method): |
| |
| ┌ ┐ |
| │ 0 0 1 0 │ |
| │ 0 0 0 1 │ |
| └ ┘ |
