[Talk-GB] newbie questions about building outlines

[Brian Prangle]

Brian

We've traced almost four hundred thousand bdgs in the West Mids from bing
imagery, our own aerial imagery and latterly for SE Birmingham, Solihull
and Coventry from Warwicks CC aerial imagery. Mostly the work of OSMers who
are retired and have the time and patience to do this. We've also worked
with West Mids and Staffs Probation Service training low level offenders to
spend their community service hours tracing buildings. When you get up to
speed you can do 200 bdgs per hour.

Agree with Tom about OS Vector bdg outlines - they're so generalized and
approximate that it's not worth the effort now we have aerial imagery.

Regards

Brian


On 29 April 2014 15:41, Brian Norman <brian at earthware.co.uk> wrote:

>  Hi Everyone
>
>
>
> As a newbie contributor I was hoping to get some advice and wisdom before
> making a mess of things ;-). At the moment I am working on a commercial
> project that needs to show building outlines for inner London. I have done
> some simple analysis to try and identify the gaps in the London coverage
> and am looking at possible options for filling in the gaps. This is where I
> have a few questions:
>
>
>
> 1)      Does anyone know if there has been a deliberate reason to not
> fill in the gaps with the generalized buildings from OS vectormap district?
> I can think of many reasons this might have been decided by the community
> but noticed that this has been done in other UK cities
>
>  2)      We are working with our client to investigate the costs of
> adding the missing buildings to OSM by tracing the Bing imagery. My
> analysis shows there are at least 100,156 buildings present in the OS
> vector district data that don't overlap a building in the OSM data within
> the area we are considering but this is a very low estimate. Does anyone
> have any rough guide for a per building time to estimate the effort
> involved?
>
>  3)      Is anyone aware of an company that are experienced in creating
> large volumes of OSM data from tracing aerial imagery?
>
>  4)      Does anyone have any other recommended approaches?
>
>
>
> Thanks for any responses and please forgive my general ignorance
>
>
>
> Thanks
>
> Brian
>
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