[Talk-GB] Postcodes to Shapefile

Emilie Laffray emilie.laffray at gmail.com
Mon Apr 26 15:20:24 BST 2010

On 26 April 2010 15:13, Jerry Clough - OSM <sk53_osm at yahoo.co.uk> wrote:

> GRASS seems to have some kind of Voronoi algorithm, but I find its
> interface very non-intuitive, so have not found it to try it out. This may
> be worth pursuing as an alternative route.
> As an aside: I notice that virtually all postcode boundaries are obviously
> created in this way. For instance the Philips Street Atlas shows totally
> implausible boundaries along the River Trent in S. Notts. Given that
> postcode boundaries are ultimately determined by logistically sensible walks
> for postmen, in this case it's pretty safe to assume that the boundary is
> actually the river. What this means is that by applying a bit of local
> knowledge and the existing points it is possible to create better
> delineating zones in OSM than appear in current mapping. Whether this is a
> good thing to do, or not, I leave for others to decide.
I think that GEOS has now implemented both voronoi and Delaunay
triangulation algorithms. I am not quite though that they have a Python
Binding. Some part of GEOS is expose through the GDAL binding, but it is

Emilie Laffray
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