Hi, I am currently developing scripts to process the 2D SHP files of the extended and projected cave profiles, and I would like to better understand how the coordinate systems are defined.

From my observations:

* Extended profile: * The X coordinate seems to start close to 0, but I cannot determine the actual origin point. There is positive and negative coordinates. * The Y coordinate appears to correspond to a plan-view Y coordinate — possibly the reference point for X — with subsequent values representing cumulative altitude differences relative to this reference. * Projected profile: * The meaning of the X coordinate is still unclear to me. * The Y coordinate appears to represent the altitude of the points. My objective is to determine how to correctly reproject a DEM/MNT profile onto both types of cave profiles. Is there anyone who can help me? Thanks Benoit Urruty