[Talk-GB] building shapes from OS Street View

[Tom Chance]

On 24 May 2010 14:43, Richard Fairhurst <richard at systemed.net> wrote:

>
> Tom Chance wrote:
> > Getting buildings right is extremely time-intensive work
>
> It shouldn't be. The tools should help.
>
>
I should have elaborated. I've found that the OS building shapes are very
simplified, and often quite wrong. Not to mention lots of text over the top
of shapes where there are place names, "School", etc.

My approach has been to use the OS StreetView Data, Yahoo! imagery and
personal surveys together, manually drawing then copying+pasting buildings
where their shapes aren't just simple rectangles, or creating the terrace
then extruding the correct shape for each home.

There's a big difference in effort between a single untagged rectangle
representing a terrace of houses (traced from StreetView, say), and that
terrace being split into individual buildings with their correct shape and
house number.

The former could be automated for the country to provide a basic navigation
aid. The latter needs a fair bit of mapping time for address searching and
other uses where precision is necessary.

Best,
Tom

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