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.
Jerry
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