Opened 9 years ago
Last modified 3 years ago
#56 closed defect
Sort out handling of geoid — at Initial Version
| Reported by: | Olly Betts | Owned by: | Olly Betts |
|---|---|---|---|
| Priority: | major | Milestone: | 1.4.0 |
| Component: | aven | Version: | 1.2.18 |
| Keywords: | Cc: |
Description
Currently the altitude of GPS fixes and hence of cave entrances attached to them doesn't match the altitude of terrain from DEM files very well - the difference seems to be a few 10s of metres.
Newer versions of proj have support for geoids, which should solve this:
https://trac.osgeo.org/proj/wiki/VerticalDatums
I think proj >= 4.8.0 is needed - the release announcement for it includes "Added preliminary vertical datum support". That was released 2012-03-14, so shouldn't be an unreasonable requirement.
It would be good to coordinate how veritcal datums are handled with therion, but they didn't respond to my email to their list about doing so.
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