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Re: Coordinates from iPhone

Subject: Re: Coordinates from iPhone
From: "Keith Smith" smith9e499
Date: Wed Jun 26, 2013 7:22 am ((PDT))
If you enjoy the extra precision, go for it. Just don't confuse it with
accuracy. You may have readings 0.01" or better and a limit of +/-5 - 30m
at the same time, so it gets misleading. It will also depend on your
location and topography, how many satellites can see you, and weather
systems. I suspect you may enjoy somewhat better repeatability in .au than
I do in .ca.

One advantage the phone might have over a typical hand held GPS is the
accelerometer (if the prog uses it). I can imagine using that to weed out
some of the more violent 'excursions' one usually sees when tracking a
static point over an hour or so, but how effective that would be would
depend on many variables. You might consider making several waypoints while
you are recording and assigning a best guess after looking at the track and
waypoints later. If the app supports easy export of a .gpx file this is no

I haven't made an exhaustive search, but it appears there are several
programs around that can geotag audio files by matching creation time with
a gpx file. With the camera, I shot raw and jpeg, dumping the jpegs into
ExpertGPS at the end of the day, giving a daily track and database entries
that were later exported to spreadsheets.

On Wed, Jun 26, 2013 at 4:55 AM, jtudor2005 <> wrote:

> **
> So you don't think it's worth recording even to 0.1". i.e. 3m? I've
> watched my previous phone continue tracking when I'm stationary, but I
> would have said it was mostly moving around within 5m of me. Even if it w=
> 10m, I would have thought recording to the nearest 1" (30m) would be
> throwing away some usable precision.
> >
> > I've also done a little geocaching, and the coordinates supplied often
> get me within metres of the caches.
> >
> > Peter Shute
> >
> I too geocached for many years.
> I'm not saying accuracy isn't important. I'm saying that searching for
> that accuracy at a reasonable cost, for what you are doing, is wasted
> effort.
> All you need to do is say 'I'm at this location for this recording' A
> metre or 2 isn't going to make a difference one way or the other.

Keith Smith - Freelance Guitarist & Location Recording

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