[OpenLayers-Users] Google and UK grid vector overlay

[Arnd Wippermann]

The code is correct.Have you included proj4js in your page? 

Otherwise
Transform depends on the proj4js library.  
If proj4js is not available, then this is just an empty stub. 


Arnd Wippermannn



-----Ursprüngliche Nachricht-----
Von: users-bounces at openlayers.org [mailto:users-bounces at openlayers.org] Im
Auftrag von Mauro Bianchi
Gesendet: Dienstag, 13. Januar 2009 11:51
An: users at openlayers.org
Betreff: [OpenLayers-Users] Google and UK grid vector overlay

Dear all,
I'm pretty new to OL and I want to do the following

1) have a google layer as a base layer
2) overlay a vector layer and add points programmatically. Points
coordinates are given in the UK national grid system (OSGB , which should be
EPSG:27700)

I could convert points coordinates externally, but I'd prefer to do it
directly into OpenLayers, if possibile.
I tried different methods but cannot get it working.
Any help would be really appreciated!

Thank you
Mauro


My code is the following


var map;

var options = {
	projection: new OpenLayers.Projection("EPSG:900913"),
	displayProjection: new OpenLayers.Projection("EPSG:4326"),
	units: "m",
	numZoomLevels: 18,
	maxResolution: 156543.0339,
	maxExtent: new OpenLayers.Bounds(-20037508, -20037508,
	
20037508, 20037508.34)
};

map = new OpenLayers.Map('map', options);

//google maps layer, physical
var gphy = new OpenLayers.Layer.Google(
	"Google Physical",
	{type: G_PHYSICAL_MAP, numZoomLevels: 20,  'sphericalMercator':true}
);

map.addLayers([gphy]);


//a vector layer where i want to add points programmatically var vectorLayer
= new OpenLayers.Layer.Vector("My Geometry");

//this is a point that i want to add in UK grid coordinates var point = new
OpenLayers.Geometry.Point(519000, 165222).transform( new
OpenLayers.Projection("EPSG:27700"), map.projection); var pointFeature = new
OpenLayers.Feature.Vector(point);

vectorLayer.addFeatures([pointFeature]);

map.addLayer(vectorLayer);

//controls and centering
map.addControl(new OpenLayers.Control.LayerSwitcher());			
map.setCenter(new
OpenLayers.LonLat(-0.126343,51.539502).transform(map.displayProjection,
map.projection), 10);




--
Mauro Bianchi
bianchimro at gmail.com
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