Self Organizing Maps for the Visual Analysis of Pitch Contours
Contours in orienteering maps
description
Transcript of Contours in orienteering maps
Contours in Orienteering Maps
Barbara Bryant
New England Orienteering Club
Cambridge Sports Union
2
Contours are brown lines on an orienteering map.
3
Sea level
http://raider.muc.edu/~mcnaugma/Topographic%20Maps/contour.htm
4
10 feet
5
20 feet
6
30 feet
7
Elevation
Which is higher: C or E? B or A? D or C?
When contour lines are close together, the land is
• Flat
• Gently sloping
• Steep
When contour lines are close together, the land is
• Flat
• Gently sloping
• Steep
A hill
A map of the hill
ReentrantsThe word “re-entrant” is a strange orienteering word.It is similar to a valley that runs down a hill, or a gully.It is located on the side of a hill.Water runs down a re-entrant.If you are standing in the middle of a re-entrant, the land goes up on three sides and down on one.
A deep re-entrant has many contour lines close together
This hill has two re-entrants
This hill has a re-entrant that starts halfway up the hill.
If you were standing at the bottom of the hill, you might not be able to see the re-entrant, especially if the trees and foliage were thick.
Re-entrants in the White Mountains of New Hampshire
Spur: An extension of a hill
Depression: a low area of land
The “hatch” marks or “tags” point downhill. This helps distinguish a depression from a hilltop.
Saddle: In between two high points and two re-entrants
Pick the correct map
Pick the correct map
b
Pick the correct map
Pick the correct map
a
Pick the correct map
Pick the correct map
b
Pick the correct map
Pick the correct map
b
Pick the correct map
Pick the correct map
a
Pick the correct map
Pick the correct map
c
Pick the correct map
Pick the correct map
b
Pick the correct map
Pick the correct map
b
Pick the correct hill
Pick the correct hill
c
Pick the correct hill
Pick the correct hill
a
Pick the correct hill
Pick the correct hill
b
Pick the correct hill
Pick the correct hill
a
Pick the correct hill
Pick the correct hill
b
Pick the correct hill
Pick the correct hill
c
Pick the correct hill
Pick the correct hill
a
Pick the correct hill
Pick the correct hill
a
Pick the correct hill
Pick the correct hill
b
Now let’s work with the map we’ll use on the field trip
Go to the next slide and pick out a hilltop.
56
Find some hilltopsTake a minute to pick out a hilltop.
57
HilltopsDid I find your hilltop?
58
Find saddlesTake a minute to pick out a saddle!
59
SaddlesDid I find your saddle?
Thanks for learning about contours!
• Excerpts were from “Armchair Orienteering” by Winifred Stott