You might take a look at the Euclidean projection referenced in this
thread: 
http://groups.google.com/group/google-maps-js-api-v3/browse_thread/thread/50421ba5c4dd307b/

Chad Killingsworth

On Dec 2, 3:39 am, Matt Roberts <[email protected]> wrote:
> Hi,
>
> I'm using google map tiler to generate tiles that I want to display in
> the google maps API, as a base layer (so they replace the google maps
> tiles completely).
>
> I have a working page based off v2 off the google maps API, which is
> taken from this example:http://examples.maptiler.org/flat/googlemaps.html
>
> In this example, a "flat projection" is implemented, and I'm trying to
> work out what projection I need in v3. I need to create various
> markers on the map, so obviously these need to be plotted in lat lngs.
> Is it enough to simply map latlongs to points and viceversa, like
> this:
>
> FlatProjection.prototype.fromLatLngToPoint = function(latlng)
> {
> return new google.maps.Point(latlng.lng(),latlng.lat());
>
> }
>
> FlatProjection.prototype.fromPointToLatLng = function(point)
> {
> return new google.maps.LatLng(point.y,point.x, true);
>
> }
>
> Any advice welcome!

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