Opened 4 years ago

Last modified 4 months ago

#56 new defect

Sort out handling of geoid

Reported by: Olly Betts Owned by: Olly Betts
Priority: major Milestone:
Component: aven Version: 1.2.18
Keywords: Cc:

Description (last modified by Olly Betts)

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 vertical datums are handled with therion, but they didn't respond to my email to their list about doing so.

Change History (7)

comment:1 Changed 4 years ago by Olly Betts

Description: modified (diff)

comment:2 Changed 2 years ago by Olly Betts

Milestone: 1.2.311.2.32

Ticket retargeted after milestone closed

comment:3 Changed 2 years ago by Olly Betts

Milestone: 1.2.321.2.33

Ticket retargeted after milestone closed

comment:4 Changed 19 months ago by Olly Betts

Milestone: 1.2.331.2.34

Ticket retargeted after milestone closed

comment:5 Changed 16 months ago by Olly Betts

Milestone: 1.2.341.2.36

Ticket retargeted after milestone closed

comment:6 Changed 15 months ago by Olly Betts

Milestone: 1.2.361.2.37

Ticket retargeted after milestone closed

comment:7 Changed 4 months ago by Olly Betts

Milestone: 1.2.37

Ticket retargeted after milestone closed

Note: See TracTickets for help on using tickets.