I’m working on an analysis to determine the correct calculation for elevation gain and loss along a line representing a real-world route (such as a trekking, marathon, or MTB course). I’m using FME and have two source vector datasets: a GPX file that already contains Z values for each vertex and a PostGIS line to which I need to assign elevations from a DTM (Draper).
Is there a standard workflow for this type of calculation?
PointOnLineOverlayer here is an example from the documentation
You may also want to consider Attribute Adjacent to perform the arithmetic calculation of gain/loss between vertices/line segments
PointOnLineOverlayer here is an example from the documentation
You may also want to consider Attribute Adjacent to perform the arithmetic calculation of gain/loss between vertices/line segments
Thank you for your suggestion! The PointOnLineOverlayer could be useful, but for now, I’ve decided to proceed by splitting the line into multiple segments using its vertices. For each segment, I will assign the start and end vertices (start_vertex, end_vertex) and then calculate the elevation difference (ΔZ) between them. Finally, I will sum up all the ΔZ values to get the total elevation gain and loss.
I appreciate your input!