From: android <here@there.was>
Subject: Re: Geotagging app
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From: android <here@there.was>
Newsgroups: rec.photo.digital
Subject: Re: Geotagging app
Date: Mon, 06 Nov 2017 16:51:46 +0100
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In article <otpos7$1ulp$1@gioia.aioe.org>,
 "Mayayana"<mayayana@invalid.nospam> wrote:

> "PeterN" <"peter,newdelete"@deleteverizon.net> wrote
> 
> | I do it the easy way. I take a snap of the location with my iPhone. All
> | relevant information is recorded.
> |
> 
>   For what it's worth, I got curious and looked at
> some photos a friend took at Mt Desert Island last
> year, on an iPhone 6. The lat/long seems to be
> very close, within yards. The altitude, however,
> is not so accurate. A photo of me looking at a rock
> on the beach recorded altitude 4.53 meters
> (14.8 feet). Another shot taken in the same
> spot (within a few feet on a nearly flat beach)
> shows 6.6 meters (21.6 feet).
> This photo...
> 
> http://www.jsware.net/Files2/cliff1.jpg
> 
> ...shows 58.84 meters (193 feet). We were probably
> 30-40 feet above the water. There may be variation,
> accounting for tides, but it still seems to be inflated
> by about 500% and/or to some extent arbitrary. How
> can it vary by 50% in the same spot with pictures
> taken a few minutes apart? I don't know. Perhaps
> different info sources? Maybe a change in cell towers
> that caused variations in location?
> 
>   It might be worthwhile to check some known altitudes
> and maybe check those against Google before depending
> on the stats. (Though I don't know what one depends on
> them for. Why does anyone care about altitude stats
> except, maybe, when mountain climbing?) 

Do your iPhone have a gyroscope? If not then it's obsolete for pinpoint 
accuracy navigation!
-- 
teleportation kills