[Talk-GB] OSM feature density vs edits per features

[Gregory]

Disclaimer: I suppose I'm a former member of the London OSM community, and
now only visit occasionally.

I'd add that it's worth noting OSM in London has history similar to the
city it's self. It's not a typical city/town, but many small villages that
expanded & grew with centres that then merged into each other. This is why
London has lots of different highstreets/market squares/"downtowns".

OpenStreetMappers in London worked on their local areas from a blank
canvas, and started expanding the distance from home/work that they mapped.
The mapping distance/radius continues to expand for as long as OSM interest
is maintained, or until they think it's reached/met other map areas. If
interest is maintained, it might be that they return/reset to 0-distance
and start adding different features/detail. The result can be fuzzy halos
of data/detail between different mapper's patches. It's hard to casually
spot those boundaries of detailed data, particularly because the existing
mappers are not regularly visiting the areas (due to the reasons that
created the anomalies).

A previous replier referred to "City of London" when I think they meant
"Central London". Be careful, because "City of London" is a very specific
place and isn't the center or downtown for most people/uses.

As for "Visiting OSMers" and their impact on data maintenance, there are
other cities I would pick to look into that. It would be good to look at,
and also to see if it can be measured how well a city/community has dealt
with it.

>From the center of Newcastle,
Gregory.


On 1 Sep 2017 12:29 pm, "Dan S" <danstowell+osm at gmail.com> wrote:

Hi

One specific possibility: I know that at least a handful of people have
been deliberately filling out London's buildings, and in un-surveyed areas
this is often by tracing building shapes from aerial views. This is
motivated by London's "patchy" coverage: areas where mappers live, plus
tourist/popular streets, are well-mapped, while other (residential etc)
areas sometimes looked blank. Maybe worth checking if the difference you
see is due to a specific object type (in particular, building=*).

Best
Dan


2017-09-01 12:01 GMT+03:00 De Sabbata, Stefano (Dr.) <
s.desabbata at leicester.ac.uk>:

> Dear all,
>
>
>
> my name is Stefano, and I am a lecturer in geography at the University of
> Leicester. Volunteered geographic information and OSM have been one of my
> research interests for a few years now. I have also done some very minor
> contributions to OSM myself, but never in London and I am not very familiar
> with the London OSM community.
>
>
>
> As I have been recently looking at some aspects data production and
> quality of OSM in London, and I was wondering whether any of you might have
> some time to help me out in interpreting some of the data… I have a couple
> of maps that can use some local expertise to make sense of them. :)
>
>
>
> In particular, I am looking at the relationship between feature density
> and number of edits per features (among other things). It looks like there
> are areas of London with consistently high density but low average number
> of edits per features. I was wondering whether this might be the result of
> local projects or mapathons organised by the community? Or might there be
> (and most probably there are) other reasons I am overlooking?
>
>
>
> If you are interested, please contact me: at s.desabbata at le.ac.uk
>
>
>
> All the best,
>
> Stefano.
>
>
>
>
>
> *Dr Stefano De Sabbata*
>
> *Lecturer in Quantitative Geography*
>
> Department of Geography,
>
> University of Leicester, University Road, Leicester, LE1 7RH, UK
>
> *t: *+44 (0)116 252 3812 <+44%20116%20252%203812>
>
> *e:* s.desabbata at le.ac.uk
>
> *w: *le.ac.uk/departments/geography/people/stefano-de-sabbata
> <http://www2.le.ac.uk/departments/geography/people/stefano-de-sabbata>
>
> *twitter: *@maps4thought <https://twitter.com/maps4thought>
>
>
>
> *Research Associate*
>
> Oxford Internet Institute, University of Oxford
>
> *oii.ox.ac.uk/people/desabbata <http://oii.ox.ac.uk/people/desabbata>*
>
> Information Geographies <http://geography.oii.ox.ac.uk/>
>
> Connectivity, Inclusion, and Inequality <http://cii.oii.ox.ac.uk/>
>
>
> [image: id:77B79125-D80D-4E72-9F70-791C2419DE28 at home]
>
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