sophia parafina schrieb: > http://iaddemo.erdas.com/Map.png > very cool! :-)
But I don't get this: > If you want to do travel cost between cities you will need to conflate > you values to a polygon layer of administrative boundaries, since the > algorithm and scapetoad only works on polygons. So its definitely > most doable. > How can I derive travel cost from roads per area? Am I right, that you want to derive cost from the density distribution of roads per area? If the density between two points is low the cost is high and if the density between two points is high the cost is low? So far so good. But what if you have for example a highway through a very large area. The points along this highway would be accessible far better than the points in this area not connected directly to this one highway, but this other points would get the same cost values to access them, because they are in the same area unit. So in the moment I think you cant make good assumptions about travel cost from density distributions. Wheighted graphs are the better model for that question I think, also for the visualization of it... ;-) regards Christian _______________________________________________ Geowanking mailing list [email protected] http://geowanking.org/mailman/listinfo/geowanking_geowanking.org
