[Talk-GB] Southwark update

[Peter Miller]

On 3 March 2011 10:14, Jerry Clough : SK53 on OSM <SK53_osm at yahoo.co.uk>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
>
>
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