[OpenLayers-Users] Google and UK grid vector overlay

[Mauro Bianchi]

Hi Thomas,

with your transformation class everything works perfect!
So I think I stay this implementation, but I still can't understand
why my proj4s version is not working.

Thanks a lot
Mauro



2009/1/14 Thomas Wood <grand.edgemaster at gmail.com>:
>
> I have an Ordnance Survey transformation class, for those that do not wish to
> use proj4js.
>
> It is available for download at
> http://ge.pythonmoo.co.uk/maps/OpenLayers.Projection.OrdnanceSurvey.js
> Please _do not_ hotlink to it.
>
>
> goliah wrote:
>>
>> Hi Arnd.
>> thank you for your response.
>>
>> No, i didn't include proj4js in my page.
>> Now I've tried to include it in my html page (and include all the
>> definitions), but it still does not work.
>>
>> Any other ideas?
>> Thank you!
>>
>> Mauro
>>
>>
>>
>>
>>
>> 2009/1/13 Arnd Wippermann <arnd.wippermann at web.de>:
>>> 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
>>> _______________________________________________
>>> Users mailing list
>>> Users at openlayers.org
>>> http://openlayers.org/mailman/listinfo/users
>>>
>>>
>>
>>
>>
>> --
>> Mauro Bianchi
>> bianchimro at gmail.com
>> _______________________________________________
>> Users mailing list
>> Users at openlayers.org
>> http://openlayers.org/mailman/listinfo/users
>>
>>
>
> --
> View this message in context: http://n2.nabble.com/Google-and-UK-grid-vector-overlay-tp2150605p2157235.html
> Sent from the OpenLayers Users mailing list archive at Nabble.com.
>
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>



-- 
Mauro Bianchi
bianchimro at gmail.com