[Talk-GB] newbie questions about building outlines

[Derick Rethans]

On Tue, 29 Apr 2014, Brian Norman 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

I wouldn't fill it in, because then things look "done", but they really 
aren't. OS vectormap is pretty too much generalized. Empty outlines give 
a good hint that a real survey needs to happen.

> 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?

I wouldn't not just trace, without also having a look. Also, this is a 
lot of work.

cheers,
Derick

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