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Re: Mapping geographic data

From: Cameron McCormack <cam@mcc.id.au>
Date: Fri, 26 Jun 2009 10:18:45 +1000
To: www-svg@w3.org
Message-ID: <20090626001844.GA8712@arc.mcc.id.au>
Jean-Claude Moissinac:
> You have to know the projection used to get the geo coordinate
> (usually WGS84, see http://en.wikipedia.org/wiki/WGS_84) and then, you
> must convert the WGS84 coordinates in your coordinate system.
> The convertion could be complex (you can find some converters on the
> web), but if you have coordinate in a relatively small region (ex size
> of France), a simple interpolation could be accurate enough (take the
> min/max of the region and do an interpolation between the min and the
> max).

Someone should make a filter using <feDisplacementMap> that performs the
projection.  It wouldn’t be suited to interactive maps, since it only
affects the rendering and doesn’t actually transform the shapes, but it
could be useful for static maps.

-- 
Cameron McCormack ≝ http://mcc.id.au/
Received on Friday, 26 June 2009 00:19:41 GMT

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