Thanks! This should do nicely. Jon Britton
Thomas Wood-4 wrote: > >> Message: 9 >> Date: Wed, 9 Jan 2008 07:25:26 -0500 >> From: Christopher Schmidt <[EMAIL PROTECTED]> >> Subject: Re: [OpenLayers-Users] Re projecting Google >> To: Jon Britton <[EMAIL PROTECTED]> >> Cc: [email protected] >> Message-ID: <[EMAIL PROTECTED]> >> Content-Type: text/plain; charset=us-ascii >> >> On Wed, Jan 09, 2008 at 03:27:11AM -0800, Jon Britton wrote: >> > >> > Hi, >> > I've got data in EPSG:27700 (British National Grid) and want to overlay >> it >> > on Google data. However, I want to reproject the Google data into >> EPSG:27700 >> > and not the other way around. Can this be done? >> >> Project the google *data*? Google ain't yours, man: You can't do >> anything fun with it (and definitely not reproject it!) >> >> > Alternatively, can OpenLayers convert from Google coordinates to >> EPSG:27700 >> > coordinates? All I need is to be able to get the 27700 coordinates of >> the >> > current view. >> >> It is possible, using the trunk versio of OpenLayers, to convert from >> Google coordinates to lon/lat. It is possible, using proj4js or perhaps >> a custom transformation function, to convert from lon/lat to EPSG:27700. >> I know of at least one person who has done it -- I'll try and remember >> who and get him to post. >> >> Regards, >> -- >> Christopher Schmidt >> MetaCarta > > I have written a class that plugs into the existing reprojection code. > > As you mention reprojecting coords here's a quick demo of usage: > ll = new OpenLayers.LonLat(-11554.3527964992,6686865.32722571); > ll.transform((new OpenLayers.Projection("EPSG:900913"), new > OpenLayers.Projection("EPSG:27700")); > > This will convert Google coords (Google sphericalMercator) to OSGB. > The class supports OSGB to and from Google (ESPG:900913), and OSGB to > and from WGS84 lat/long (ESPG:4326). > > Some of the math functions are poorly documented (it was a quick > convert from an already-existing conversion class) > > Finally, the code is here: > http://ge.pythonmoo.co.uk/maps/OpenLayers.Projection.OrdnanceSurvey.js > Please don't hotlink it. > > -- > Regards, > Thomas Wood > (Edgemaster) > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users > > -- View this message in context: http://www.nabble.com/Reprojecting-Google-tp14709777p14730820.html Sent from the OpenLayers Users mailing list archive at Nabble.com. _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
