Thanks very much for this Robert. I'd made a start trying to do this myself, but had a steep learning curve with PostGIS. My main suggestions (which will make the file bigger) are: a) retain the original centroid values (these are near as dammit a primary key); and b) keep one or more of the district authority columns. In particular the latter will make it very much easier to filter for people interested in a particular district, rather than having to fiddle with bounding boxes.
Jerry ________________________________ From: Robert Scott <li...@humanleg.org.uk> To: talk-gb@openstreetmap.org Sent: Thu, 13 May, 2010 17:23:08 Subject: [Talk-GB] OS Locator / OSM correspondence list generation Hi all, I've been running some countrywide comparisons of the recently released OS Locator against the streets in OSM, using fuzzy string matching and the supplied bounding boxes to attempt to match each street in each dataset to one in the other. It's worked pretty well for most areas I tested. Of the ~826k named streets in OS Locator, about 424k of them have near perfect matches in OSM. A few tens of thousands more have what I would call spelling 'disagreements'. The rest of them have bad or no matches at all. I've put a description of the technique up here along with the preliminary results: http://humanleg.org.uk/code/oslmusicalchairs The thing I really need is suggestions for getting this data to users in a way that's practical to work with. It's a CSV currently. Thoughts welcome. So are bug reports of where my matching algorithm has gotten things wrong. robert. _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-gb
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