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I’ve been playing with some ideas, code and Carlson Civil Suite today and I’ve stumbled across an interesting issue with Carlson’s contour routine.

Given this equation for a hyperbolic paraboloid, For more information on this surface

 
And porting some code to VBA so everyone can follow along

Option Explicit
Public Sub Parabolid()
Dim x As Double
Dim y As Double
Dim z [...]

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How many times have you pieced together the spot elevation data on a set of plans, triangulated it and then contoured it only to find isolated areas where the triangulation routine did not quite get it right? I sometimes contour at ridiculous contour intervals searching for any small anomalies that won’t show up on a [...]

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