Ticket #119 (new defect)
Opened 4 months ago
Transformations going from NAD27 to new HARN/... datums are not using HARN grid files
| Reported by: | baertelchen | Owned by: | baertelchen |
|---|---|---|---|
| Priority: | minor | Milestone: | |
| Component: | Dictionaries | Version: | |
| Keywords: | Cc: |
Description
In changeset 1926, to fix ticket 65, new HARN-based coordinate systems, datums and transformations had been added to the dictionaries.
However, the paths dictionary hasn't been updated. This currently leads to the following transformation behavior:
- converting from LL27 to HPGN uses the NADCON/HPGN grid files.
- converting from LL27 to HARN/... uses an analytical transformation from NAD83 to HARN - but not the grid files.
Also, there's nothing wrong with the HPGN-based systems per se; i.e. they do not have incorrect parameters or so. Depending on the use case, the newly introduced HARN/... systems and datums might more appropriate.
We should fix this ticket as follows:
- move the HPGN-based systems out of the LEGACY group.
- add new geodetic paths so that transforming from LL27 to HARN/... uses the grid files.
