I have shapefiles of a road network and five points. What I would like to do is measure the distance from each point along the road network using QGIS, but am struggling to achieve this. So far, I have tried both v.net.distance and v.net.iso, to no avail. Each attempt returns 'Error: Vector map not found'. What could I be doing wrong?
If you use the QGIS Desktop 2.xx with GRASS 7.xx application then you may need to first import your road network and points layer.
You could use:
v.in.ogr- to import your layers using their path or
v.in.ogr.qgis- if your layers are already loaded into QGIS
You can access these tools from the menubar:
Plugins > GRASS > Open GRASS Tools
Note that you may need to create a GRASS mapset first before using the tools.