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Re: [gpsd-dev] ✘wgs84_separation()

From: Gary E. Miller
Subject: Re: [gpsd-dev] ✘wgs84_separation()
Date: Fri, 19 Jul 2019 11:39:34 -0700

Yo Michael!

On Fri, 19 Jul 2019 02:38:39 +0100
"Michael J. Tubby B.Sc. MIET" <address@hidden> wrote:

> This is really interesting.... *but* can we not just settle on WGS84 
> 'altitude', i.e. above [or perhaps below] the WGS84 geoid datum, and 
> allow users to transform this to their datum (eg. Newlyn Height, in
> the UK) or NAD83 or any of the hundreds of other datum?

I think we already did:

On Thu, 18 Jul 2019 20:15:56 -0400
Greg Troxel <address@hidden> wrote:

> > And it seems like we agree on:
> >     altHAE
> >     altMSL
> >     geoidSep
> >
> > That is really all I wanted from the beginning of this discussion.  
> Yes, that's good enough to stop arguing.

For now that is my plan.  Right now I am working on updating
wgs84_separation() to EGM2008 (MSL).  That improves geoidSep, then
I'll add altMSL and change altitude to altHAE.

With any luck the doc for that will not raise any new issues.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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