Geolocation

[Daniel Larkin]

Hi all,

I'm writing a simple webapp which uses geolocation. However after
calling it from the body tag and I sequentially plot the position
using google maps api the accuracy is frequently quite poor. Is there
something I'm missing? I know on the iPhone google map app the
accuracy of the pulsing blue dot seems to improve over a 10-20 seconds
period?

Do I need to make multiple calls to geolocation perhaps?

Many thanks!

[Rémi Grumeau]

Yeap i tested it also, putting the geolocalisation result on a google maps.

The localisation was 6km from where i was, so i start the Maps app ... which locate me at 12km from where i was !!

Can't tell if it's a GPS problem, iphone specific problem, HTML5 geolocalisation issue ...

Le 7 nov. 09 à 23:39, Daniel Larkin a écrit :

[Ahrjay]

On Nov 8, 9:39 am, Daniel Larkin <daniel.lar...@gmail.com> wrote:
> Do I need to make multiple calls to geolocation perhaps?

Depends how you are calling it. Are you watching the position object
so it fires everytime the gps gets a new location?

From the spec "The API itself is agnostic of the underlying location
information sources." meaning it will work with what it has available.
On the iPhone it'll use GPS, Cell Tower Triangulation and/or IP
address. If you results aren't great it may not be using the GPS and
falling back to one of the other options.

I wrote an article and did a demo on using the geolocation api on the
iPhone. http://www.thecssninja.com/javascript/geolocation-iphone, I
get very accurate results when using it outside with a clear view of
the sky.

-Ryan

[Remi Grumeau]

Made some test again, and it's a bit more accurate ... but like Ryan says, it definitely needs an outside clear sky use.
try it here http://www.remi-grumeau.com/iphone/geolocalisation_test.php

(simple HTML5 geolocalisation use and put back onto a Google Maps API)

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[StanRB]

I've had the same issue of poor accuracy. I think it is much more
accurate on the iPhone 3Gs. Anybody know if there is a way to make the
phone use only the GPS and not other means of getting location?


This is my first post on this group. I spent some time reading around.
I hope I can contribute - I certainly have a lot of questions :)!

Cheers!

On Nov 12, 6:40 am, Remi Grumeau <remi.grum...@gmail.com> wrote:
> Made some test again, and it's a bit more accurate ... but like Ryan says,
> it definitely needs an outside clear sky use.
> try it herehttp://www.remi-grumeau.com/iphone/geolocalisation_test.php
> <http://www.remi-grumeau.com/iphone/geolocalisation_test.php>(simple HTML5
> geolocalisation use and put back onto a Google Maps API)
>

> On Thu, Nov 12, 2009 at 00:36, Ahrjay <seddon.r...@gmail.com> wrote:
>
> > On Nov 8, 9:39 am, Daniel Larkin <daniel.lar...@gmail.com> wrote:
> > > Do I need to make multiple calls to geolocation perhaps?
>
> > Depends how you are calling it. Are you watching the position object
> > so it fires everytime the gps gets a new location?
>
> > From the spec "The API itself is agnostic of the underlying location
> > information sources." meaning it will work with what it has available.
> > On the iPhone it'll use GPS, Cell Tower Triangulation and/or IP
> > address. If you results aren't great it may not be using the GPS and
> > falling back to one of the other options.
>
> > I wrote an article and did a demo on using the geolocation api on the

> > iPhone.http://www.thecssninja.com/javascript/geolocation-iphone, I

> > get very accurate results when using it outside with a clear view of
> > the sky.
>
> > -Ryan
> > --~--~---------~--~----~------------~-------~--~----~
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> > "iPhoneWebDev" group.
> > To post to this group, send email to iphone...@googlegroups.com
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> > iphonewebdev...@googlegroups.com<iphonewebdev%2Bunsu...@googlegroups.com>

[Chris Collett]

Have you tried testing it with another service besides gmaps? Just curious, it could be Google Maps.

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[Remi Grumeau]

On Thu, Nov 12, 2009 at 17:27, Chris Collett <chris.j...@gmail.com> wrote:

Have you tried testing it with another service besides gmaps? Just curious, it could be Google Maps.

Sure, i thought the same first ... and then i refresh the page two or three times.

On the first run, it's always a dozen meters away, first refresh too. But from the second one, it's a couple of inch accurate !

Check by yourself on this previous example.

Strange behavior btw ...

I'll try to do so with a Bing! map and Yahoo! too

[GeoNomad]

It may be useful to look at the timestamp associated with the
location. It will tell you when that location was fixed. When inside,
I have seen it go to several days old.

On Nov 12, 11:05 am, Remi Grumeau <remi.grum...@gmail.com> wrote:

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>
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