You could try the transformation service on http://proj4js.org/
If you want to transform programmatically, try var extent = new OpenLayers.Bounds(-13.5,51.5,-4.5,55.5 ).transform( new OpenLayers.Projection("EPSG:4326), new OpenLayers.Projection("EPSG:900913) ); Regards, Andreas. eoinyp wrote: > Thank you Alexandre, > I now realise that the (-180,-90,180,90) system wont work because Im using > EPSG:900913, spherical mercator, which is where The projection > maxExtent: new OpenLayers.Bounds(-20037508, -20037508,20037508, 20037508.34) > comes in. > Thank you. > But Im still stuck as to how to set the map to focus on Ireland. I dont > understand how to define the bounds of a suitable box. Can you give me any > pointers there? > Thanks, > > Eoinyp. > > > > > > Alexandre Dube wrote: > >> Hi, >> >> This should helps : >> >> http://trac.openlayers.org/wiki/FrequentlyAskedQuestions#Projections >> >> Regards, >> >> Alexandre >> >> eoinyp wrote: >> >>> Hi all, >>> Could someone please explain how to define the bounds of a map? >>> >>> I want to centre my map on Ireland when it initialises, but I am having >>> trouble with the bounds arguments. >>> As I understand it, the maxExtent of the globe is (-180,-90,180,90) >>> A box around Ireland using the same coordinate system is (-13.5, 51.5, >>> -4.5, >>> 55.5) >>> So shouldnt I be defining my map as: >>> maxExtent: new OpenLayers.Bounds(-13.5,51.5,-4.5,55.5 ) >>> ? >>> This doesnt work, unsurprisingly. >>> I found somewhere else the bounds of the world defined as: >>> maxExtent: new OpenLayers.Bounds(-20037508, -20037508,20037508, >>> 20037508.34) >>> which works great, but it shows the entire globe, as I said, I want to >>> focus >>> on Ireland. >>> What coordinate system is this? and how do I translate the area I want to >>> map to this coordinate system? >>> >>> The variable maxResolution also seems to vary from map to map, I am not >>> sure >>> what this should be set to. >>> The documentation doesnt give any idea of the range of appropriate >>> values. >>> Thanks, >>> >>> Eoinyp. >>> >>> >>> >> -- >> Alexandre Dubé >> Mapgears >> www.mapgears.com >> >> _______________________________________________ >> Users mailing list >> Users@openlayers.org >> http://openlayers.org/mailman/listinfo/users >> >> >> > > -- Andreas Hocevar OpenGeo - http://opengeo.org/ Expert service straight from the developers. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users