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Slope of polyline - Python syntax error 000989

CamillaRootes

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!

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CamillaRootes

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 degrees slope)

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CamillaRootes

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 degrees slope)

DanPatterson_Retired

On a side note, I hope you are calculating values for straight lines since the formula is incorrect if it isn't. If you want to calculate the straight line slope between the start and end points, you will also need to calculate the distance between those two points ... not using the shape length, but the actual coordinates. If they are straight lines... never mind.

DanPatterson_Retired

GetSlopePerc(!Shape!,!SLength!)

def GetSlopePerc(Shape,Leng)

in ration change !SLength! to Leng

CamillaRootes

Just noticed the error on line 4 in the above code. Have corrected it, but it wasn't the cause of the issue.

CamillaRootes

I've made changes to the expression box and the indentation. What do you mean about passing the SLength field in?

At the moment I'm still getting the same error, with the syntax issue still on line 3.

Here is the code:

DanPatterson_Retired

in your expression box, it should be !Shape! with the s capitalized. Also check your indentation, it looks sketchy. And you need to pass the !Slength field in as well

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