On Tue, 2009-06-16 at 18:04 +0100, Adrian Clark wrote:
I'm afraid I wasn't being clear in my earlier message. If you're one of the lucky people having a camera-with-GPS, I imagine everything will work perfectly. I was talking about trying to geo-reference photos that don't have such data -- I have about 20,000 such photos myself, as well as about 50 Gb of photos from the Colchester Archaeological Trust that could do with being geo-referenced!
So I take it you generally know the place name where the photo was taken and want to work back to the longitude and latitude in order to tag the photo.
This seem very similar to the indexes used by satellite navigation systems which in my experience work well when the input is well structured like for example a post code or an exact street address but are much less good for a place with a simple description like "The Mill, Saxted" or "The top of Glastonbury Tor". There is often a "Points of Interest" index to try to make up for this but it is usually incomplete and out of date.
Are there any collaborative projects to build a useful place name to coordinate index online? I know someone started a project to build a postcode to coordinate index collaboratively so free software would have the use of such an index rather than having to license the data from Royal Mail.
Steve.