Re: [android-developers] Which Reference System is used by the Google Maps Api

[Pepijn Van Eeckhoudt]

It doesn't seem to be documented but I would assume they are using 
WGS-84. GeoPoints are as a lon/lat coordinate so that rules out usage of 
projected grid coordinates. The correct definition of the 'google 
projection' can be found in epsg:3857. That essentially says to project 
WGS84 ellipsoid lon/lat coordinates using the spherical variant of the 
mercator projection. Given that definition it seems logical to me that 
they would interpret lon/lat coordinates wrt WGS84 to avoid datum 
transformations.


So in short, I think it's safe to assume that all lon/lat coordinates 
that you get from/pass to the maps api should be interpreted wrt the 
WGS84 datum.


Pepijn

On 05/05/2011 21:18, Julian wrote:

Anyone?

2009/11/25 Mathias >


Hi,

which Spatial Reference System is used by the Google Maps API and in
which Reference System are the GPS coordinates to be received by a
LocationProvider?
I only can assume that the Location Services use WGS84, or EPSG:4326.
But what if I use GeoPoint? Will it require WGS84 or the Google Maps
Projection (some kind of traverse mercator projection EPSG:90913). And
what reference do the Projection.fromPixels(..) and
Projection.toPixels
(..) methods require?

I ask because I want to display some GeoData to an Overlay and I have
to decide in which reference system I have to request it from my
Services.

Kind regards

Mathias

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Re: [android-developers] Which Reference System is used by the Google Maps Api

[Julian]

Anyone?

2009/11/25 Mathias 

> Hi,
>
> which Spatial Reference System is used by the Google Maps API and in
> which Reference System are the GPS coordinates to be received by a
> LocationProvider?
> I only can assume that the Location Services use WGS84, or EPSG:4326.
> But what if I use GeoPoint? Will it require WGS84 or the Google Maps
> Projection (some kind of traverse mercator projection EPSG:90913). And
> what reference do the Projection.fromPixels(..) and Projection.toPixels
> (..) methods require?
>
> I ask because I want to display some GeoData to an Overlay and I have
> to decide in which reference system I have to request it from my
> Services.
>
> Kind regards
>
> Mathias
>
> --
> You received this message because you are subscribed to the Google
> Groups "Android Developers" group.
> To post to this group, send email to android-developers@googlegroups.com
> To unsubscribe from this group, send email to
> android-developers+unsubscr...@googlegroups.com
> For more options, visit this group at
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[android-developers] Which Reference System is used by the Google Maps Api

[Mathias]

Hi,

which Spatial Reference System is used by the Google Maps API and in
which Reference System are the GPS coordinates to be received by a
LocationProvider?
I only can assume that the Location Services use WGS84, or EPSG:4326.
But what if I use GeoPoint? Will it require WGS84 or the Google Maps
Projection (some kind of traverse mercator projection EPSG:90913). And
what reference do the Projection.fromPixels(..) and Projection.toPixels
(..) methods require?

I ask because I want to display some GeoData to an Overlay and I have
to decide in which reference system I have to request it from my
Services.

Kind regards

Mathias

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