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Contours & Sections

by Derek Rush (Submitted: 09/24/2003)

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CONTOURS and SECTIONS.
This model uses the terrain modelling of Netlogo Tutorial 3, (modified), to set up a
terrain and then provides for contouring and sectioning. There is a SMOOTHNESS
setting for changing the character of the terrain, 10 is rough and 40 is smooth.
Press SETUP TERRAIN to begin.
The patch elevation monitor is helpful for examining the contoured areas and other
features of the terrain.

CONTOURS

Contouring is achieved with the help of 'neighbors4' by instructing the patches at the
selected elevation to change color. It is limited to three elevations because any more
will clutter the display.
The contour elevations selected are printed with colour identification in the Command
Center window.

SECTIONS

Sections are measured by walking a turtle across the terrain and plotting the elevation
against distance walked. The MOUSE POINTER and 'x&ycor' monitors are used to select
start and finish patches. Press START SECTION then place the POINTER on the start patch,
the START SECTION button will remain down for 10 seconds. Then press END SECTION and
move the "POINTER" to the finish patch, again 10 seconds are provided to select the patch.
The END SECTION button will remain down and the walk will take place, with the button
restoring afterwards.
The walker and the walk are coloured to match the colour of the plot.
A section may be taken through any two patches.

The color of the plot changes with each walk until a new terrain is modelled, when the
plot is also cleared; but CLEAR-PLOT may be used to remove unwanted plots after each walk.

The author Derek Rush can be contacted by Email. <derekrush@beeb.net> September 2003

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