On 3 March 2011 10:14, Jerry Clough : SK53 on OSM <[email protected]>wrote:
> On 03/03/2011 09:51, Richard Mann wrote: > > I think you might also consider a path density map or a > shop/pub:street density map. That's the sort of stuff where OSM can > really do much better than OS / Google. > > Richard > > > > This was exactly what I was trying to do with my various pub density > maps<http://sk53-osm.blogspot.com/2011/02/updating-pub-density.html>. > I did do various attempts to normalise pub density to highway length but > none of them showed anything interesting. I have also looked at turn > restrictions, and public toilets as potential proxies for things mapped on > the ground versus things mapped remotely. A recent diary entry pointing to > Gregory Williams cycle-parking heatmap highlighted another possible > candidate. Unfortunately most of these maps (like the Botanical Society's maps > > <http://www.bsbimaps.org.uk/atlas/map_page.php?spid=2952.0&sppname=Cotoneaster%20rehderi&commname=Bullate%20Cotoneaster>of > distribution of *Cotoneaster *species) mainly show where mappers live or > are active. > > As more of the highway network gets completed by remote mapping, the more > important it is to find handles for on the ground mapping. > > Pete Reed did some nice > comparisons<http://tlatet.blogspot.com/2010/04/more-osm-coverage.html>between > highway length by authority as reported by the DoT and OSM road > length. I'm not aware of him having updated these recently. > > Incidentally, 0% discrepancy between OSM and OS Locator is inadequate as an > indication of streetname completion: the next test would be to check OSM > names against PAF to see how many address elements were missing. > Unfortunately, we would not be able to use any of the detail: but even > headline figures by LA might be interesting. I've noticed a trend in new > in-fill huosing developments for houses facing a main road to have a > separate name (e.g., here <http://osm.org/go/eu8Z4HWl1-->), which does not > appear in Locator, nor do side terraces in late-19C/early-20C housing (e.g., > here <http://osm.org/go/eu8ZmJWOR--> or here<http://osm.org/go/eu8Zn0fu1-->). > All these examples are places I've added this year. > > I agree that the whole concept of 'completeness' is problematic but I is a very useful way-point in that direction. As far as current OS data users that is what they will think of as 'good enough' so for them it is a useful concept. I do want to do analysis of how many additional names we have that are not in OS Locator. Possibly we call that 105% OS Locator completeness! Regards, Peter Jerry > > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb > >
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