Slope of polyline - Python syntax error 000989

[CamillaRootes]

Hi

I am trying to calculate the % slope of multiple polylines in a shapefile. I am using Arc 10.1 with the basic licence.

When I run my code in the Field Calculator I get a Python syntax error on line 3. I can't see the issue - can someone tell me where I'm going wrong?

My code is:

NB - I am not sure what directions the polylines were digitised in. Hence I don't know if the last point is at the higher elevation or vice versa, which is why I am trying to return the absolute change in z value.

The error read out I am getting when I run the code is:

Thanks in advance!

[CamillaRootes · Accepted solution]

I've written up the solution to this problem, including Field Calculator Python codes for straight line length, percentage slope and degrees slope. See this document for my write-up:

Python code for straight line slope of a polyline (inc. straight line length, pecentage slope, and d...