Re: [Geotools-gt2-users] Coordinate Transform

[Martin D. <mar...@ge...>]

Abraham Mármol Asís a écrit :
> I only need to convert a point expressed in EPGS:20030 (what is a
> mercator projection) and then obtain its equivalent Longitutude and
> latitude (that suites the google system) to invoque the google map
> method:  map.setCenter (new GLatLng(myLat,myLong), myZom);
>  
> The problem is how to obtain that long,lat corresponding to EPSG
> Projection...

A possible approach is to transform from EPSG:20030 to EPSG:4326 (which is
latitude,longitude on WGS 84 ellipsoid).

Be aware that (latitude,longitude) are not unique. For example (40°N, 10°E) do
not design a single location. It may be many different locations, depending of
the underlying CRS. (40°N, 10°E) in WGS 84 may be one km apart from (40°N, 10°E)
in an other geographic CRS! So the choice of the target GeographicCRS really matter.

I believe (not sure - Andrea could confirm) that the Google CRS has been added
in the Geoserver code base, not in the Geotools code base. In the main time, WGS
84 (EPSG:4326) is probably the closest CRS available in GeoTools.

	Martin