[Talk-GB] newbie questions about building outlines

[Tom Chance]

On 29 April 2014 17:24, Derick Rethans <osm at derickrethans.nl> wrote:

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

I think this depends on your purpose and the area.

If you just need to know "here be buildings" then there's no need to visit
the area. But if you need to know each individual building, and to be clear
about whether you're looking at a roof overhang or some funny coloured
pavement, and if you want to add information like addresses and amenities,
you definitely need to visit the area. If it's the former then he is
probably better off just using VectorMap anyway and not filling OSM with
inaccurate traces.

In places like central London (e.g. http://binged.it/1u2ZY9t) buildings are
so complicated and bunched together that a visit is really a must to get
any more than "here be buildings".

In many other areas of inner London, particularly residential (e.g.
http://binged.it/1iByiPy), the typologies and shapes are pretty easy to
understand from aerial imagery so you can accurately guess individual
buildings.

Obviously a ground survey is better, but I don't think it's always
necessary to get good building coverage. The trouble for Brian is that it's
difficult to estimate the need for surveys without examining all the
imagery.

Regards,
Tom

-- 
http://tom.acrewoods.net   http://twitter.com/tom_chance
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