I have two shapefiles, the first representing a path (a polyline with a single category), the second representing isochrons from the same origin (point 0) which intersect the above mentioned path. I wonder if it is possible to divide the polyline (path) by the intersecting isochrones (at point 1, point 2, etc.), thus obtaining a segmented polyline with different categories.
QGIS has an useful tool called "line intersections" (vector - analysis tools - line intersections), but it only creates a further shapefile with points at the intersections of the two layers.
Can someone suggest a solution preferably in QGIS or GRASS GIS.