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Re: moving to 8 digits of lat/lon (gpxlogger, maybe elsewhere)?


From: Gary E. Miller
Subject: Re: moving to 8 digits of lat/lon (gpxlogger, maybe elsewhere)?
Date: Thu, 3 Sep 2020 12:22:40 -0700

Yo Greg!

On Thu, 03 Sep 2020 15:06:03 -0400
Greg Troxel <gdt@lexort.com> wrote:

> > And some u-blox reports lat/lon to 1e-9 degrees and altitude to 0.1
> > mm. See F9P:  UBX-NAV-HPPOSLLH  
> 
> well, I guess that's 10x more.

Yup.

> I am a bit shy of rebuilding regression tests myself.  Perhaps I will
> stage things on a branch, keep it rebased, and you can review,

The problem is the pipeline will break, so GitLab omplain.

"scons make-regress" is all it takes.  If you make it an MR I can
check before merging.

> >> And, this is a general proposal that whenever anything in gpsd does
> >> lat/lon, it uses %.8f, basically, and %.3f for height (in meters of
> >> course, and hence mm).a  
> >
> > Works for me.  Maybe evenn %.9f degrees and %.4f meters, so we
> > don't need to do again soon.  
> 
> seems maybe a bit much, but "don't do it again" seems wise, so that's
> ok and I will head for that.

We'll prolly need some client filters so noobs don't freak at the spinning
digits.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        gem@rellim.com  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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