When I draw a track in Google Earth, for example along a road, I can right-click it to "Show elevation profile", and it displays a 2D plot of distance vs elevation. However, if I save the KML, the elevation coordinate is always zero.
So let's suppose I import the KML LineString in QGIS, and I have a SRTM DEM layer, how can I:
- Display an elevation profile (distance along road vs DEM elevation at point);
- "Replace" the (zeroed) elevation profiles of KML by DEM elevation values, so that I could export back to kml and have elevation "hardcoded" in the LineString.