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The book

OpenStreetMap
Using and Enhancing the Free Map of the World.
By Frederik Ramm,
Jochen Topf,
and Steve Chilton.

Events

Karlsruhe Hack Weekend 18-19 February 2017

FOSSGIS 2017 in Passau, 22-25 March 2017

Projects

Residential Areas

A client from the IT industry required a shape file describing residential areas.

Residential areas can be mapped in OpenStreetMap but they aren't always mapped properly; even in otherwise well-mapped areas, you sometimes only have houses or residential roads but not the areas. But it is possible to fix that by extrapolation.

In a first step we took all areas clearly marked "landuse=residential". Because that's not sufficient, we added residential roads to the mix.

Roads are line geometries but we want areas. This can be solved by making a large buffer around roads, and computing the union of these buffers (which will overlap in residential areas). Later, a similarly large negative buffer is computed from the resulting shapes, making sure that the area doesn't extend too far out.

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