I'm quite new to QGIS and trying to figure out how to analyze the following problem.
I have three layers:
- settlements point layer with 253 entries
- waste treatment facilities point layer with 24 entries
- roads polyline layer
My problem is to find the distance between each settlement from layer (1) to each treatment facility in layer (2), however it has to be subjected to roads (layer 3), namely instead of getting aerial distance matrix I am looking for to the matrix that describes the actual driving distance.
I'm kindly asking your help with suggestion of how to perform this analysis with QGIS 1.7 (note that I don't know how to use PostGIS layers, if relevant)
- what plugin can or should I use?
- Should the polylines be connected to the points in both layers?