Opened 14 years ago
Last modified 14 years ago
#3737 closed defect
NAD27 expands to use towgs84 instead of grid shift files — at Version 1
| Reported by: | warmerdam | Owned by: | warmerdam |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | OGR_SRS | Version: | unspecified |
| Severity: | normal | Keywords: | nad27 |
| Cc: | Even Rouault |
Description (last modified by )
For reasons that are not clear, the expansion of "NAD27" in OGRSpatialReference::SetWellKnownGeogCS() has include a TOWGS84[] approximation in the WKT for a very long time.
With the introduction of r19903 the translation of the WKT to PROJ.4 format uses a +towgs84 parameter instead of the +nadgrids directive (previously implicit from +datum).
On a related note the current expansion of EPSG:4267 (NAD27) uses a towgs84 value from the datum_shift.csv.
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