Trying to calculate the 3D surface length of a polyline on a DEM.
Using the Add surface information & interpolate shape tools both work but return almost identical number if not the same value. Over a 50km DEM with changing elevation it should be more than the 2D length. See attached image. Both 2D shape length and 3D Shape Length identical at 45.031Km
Seen a similar post on here but no solution as to why the value returns the same. ![ESRI 3D.PNG ESRI 3D.PNG](https://community.esri.com/t5/image/serverpage/image-id/79121iDAE7D03FCAFCD3FB/image-size/medium?v=v2&px=400)