Hi Seb, I know you wouldn't normally expect to get this sort of advice from me, but oddly I spent a while last night looking at:
http://www.gdal.org/gdalwarp.html Finding a tutorial is another thing... Tom 2009/11/3 Seb Bacon <[email protected]>: > 2009/11/2 Mark Steward <[email protected]>: >> Google Maps just uses a Spherical Mercator projection. That .png looks like >> the National Grid (which is a TM projection). Do you have a link to the >> original SVG? > > I imagine you're right about the National Grid, given that according > to the Wikipedia page is "ultimately based on data from the Boundary > Commission". > > Let's say it is... where would I start looking in order to work out > how to transform a projection from TM to STM? > > Thanks, > > Seb > > >> -------------------------------------------------- >> From: "Timothy Green" <[email protected]> >> Sent: Monday, November 02, 2009 11:27 PM >> To: <[email protected]>; "mySociety public, general purpose discussion >> list" <[email protected]> >> Subject: Re: [mySociety:public] question for the geogurus >> >>> Google maps is apparently UTM (which looks like a complete mess to >>> tranform) and having a look around wikimedia has revealed nothing useful >>> about the projection of the election map we have. Hrm. >>> >>> -t >>> >>> Seb Bacon wrote: >>>> >>>> Hi, >>>> >>>> I'm trying to fit the Wikipedia UK election map SVG over the top of >>>> the Google Maps UK outline: >>>> >>>> >>>> >>>> http://maps.google.co.uk/maps?q=http:%2F%2Fwww.democracyclub.org.uk%2Fmedia%2Fall-uk.kml >>>> >>>> It doesn't fit. I'm hoping this is some well-known issue around >>>> different projections which I can solve with a transform of some kind. >>>> I'm hoping the answer *isn't* "those maps are just differently >>>> inaccurate". >>>> >>>> Cheers >>>> >>>> Seb >>>> >>>> >>> >>> >>> _______________________________________________ >>> Mailing list [email protected] >>> Archive, settings, or unsubscribe: >>> >>> https://secure.mysociety.org/admin/lists/mailman/listinfo/developers-public >>> >> >> _______________________________________________ >> Mailing list [email protected] >> Archive, settings, or unsubscribe: >> https://secure.mysociety.org/admin/lists/mailman/listinfo/developers-public >> > > > > -- > skype: seb.bacon > mobile: 07790 939224 > > _______________________________________________ > Mailing list [email protected] > Archive, settings, or unsubscribe: > https://secure.mysociety.org/admin/lists/mailman/listinfo/developers-public > _______________________________________________ Mailing list [email protected] Archive, settings, or unsubscribe: https://secure.mysociety.org/admin/lists/mailman/listinfo/developers-public
