[Freegis-list] (no subject)

[Jan-Oliver Wagner]

Dear Michael,

On Tue, Nov 14, 2000 at 02:32:18PM +0100, Michael Herter wrote:
> ist eine Routine bekannt, die auf Basis
> eines Shapefiles die Strecke von
> A nach B ermittelt?

For those who don't speak german:
The question was whether you know any routine that computes
a route (or a distance?) from A to B on the basis of shapefiles.

Route: Shapefiles have no topology, hence standard algorithms can not
directly be applied on shapefile-based data.
Thus the requested routine must at least build some topologic
information out of the shapefile data.

Distance: Much easier. Without consideration of the projection
it is a 10-lines program based e.g. on shapelib.
With consideration of a projection it might make sense to
incorporate PROJ4.

Cheers

	Jan

-- 
Jan-Oliver Wagner               http://intevation.de/~jan/

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