Has anyone come across this issue with changes in direction of extended elevations, when PocketTopo files are processed with TopParser or exported to Therion?

ie, the centreline developing in the opposite direction to the original sketch?

The extended elevation is OK in PocketTopo, but regardless of the method used to parse it to Therion, the second part of the survey extends the wrong way in the xvi file.

In this file, station 1.0 is where the survey started, first downstream, then we went back to station 1.0 and continued upstream.  The second part of the survey has the legs ‘flipped’ so that they extend left.

I eventually worked around this by deleting the downstream legs.  Now the second set of legs starting from station 1.0 correctly extend left.

I’m wondering if this behaviour is due to having two ‘branches’ of survey legs extending from the first station in the survey, 1.0, with one extending right, and the other left?

Perhaps this is a limitation or bug with the code that parses from .top to .xvi (for both TopParser and ‘Therion method’)?

Bruce