I am trying to refine/populate gpx tracks recorded by a GPS device. I would like to add 1 or 2 points between each gpx point recorded and snap these additional points to roads.
I am using essentially QGIS. Any suggestion how I could do this?
This issue is also discussed in this topic how-to-create-an-exact-tracking-route-from-gps-data.
As mentionned in one answer, the problem is called map matching.