asked on How do I convert Latitude and Longitude to a UK Postcode?
For a given lat/long pair as input, say {57.1475, -2.0954}, how do I find which UK postcode that point is in? Is there some way to do this for free, without having to use a commercial library or web service?
Would a very large amount of boundary data be required to do this acurately, and if this is infeasably large, what is the best way to get data for a reasonable time/space efficient approximation without being too complex?
Would a very large amount of boundary data be required to do this acurately, and if this is infeasably large, what is the best way to get data for a reasonable time/space efficient approximation without being too complex?
JavaGIS/GPS ProgrammingMath / Science
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Infinity08
ASKER
Is this list the only alternative to purchacing the real database? How would I use the list? Querying it to find the lat/long of a specified postcode would be easy, but how would I do that in reverse? Ittterate the enitre list to find the closest value? Are these GPS co-ordinates in the approximate center of the postcodes or just random points inside them? I guess it could still be of some used.
To get the location, you can use Google:
http://maps.google.com/support/bin/search.py?query=latitude&ctx=en%3Asearchbox&Action.Search=Search
You could then use your central mail courier's site (usps.com here in the States) to check that town's ZIP codes, use local maps, etc.
http://maps.google.com/support/bin/search.py?query=latitude&ctx=en%3Asearchbox&Action.Search=Search
You could then use your central mail courier's site (usps.com here in the States) to check that town's ZIP codes, use local maps, etc.
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http://www.freethepostcode.org/
You can download the list they created from that site :
http://www.freethepostcode.org/currentlist