How Do We Construct a Topographic profile? Objective: To accurately construct a profile along any two points on a contour map.
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How Do We Construct a Topographic profile?
Objective: To accurately construct a profile along any two points on a
contour map.
21 30 4 km
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C.I. = 10m
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DO NOW: Draw a side view along points XY of the surface feature shown in the map.
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C.I. = 10m
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Step 1: Number all contour lines above the line XY.
21 30 4 km
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26.5m
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.20
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3010
10
Step 2: Draw a horizontal grid that represent the distance XY. (done for you)
YX0
3040
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Step 3: Transfer the points where the contour lines cross the points XY from the contour map to a paper.
Piece of paper
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YX0
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Step 3: Transfer the points where the contour lines cross the points XY from the contour map to a paper.
21 30 4 km
ocea
n
Riv
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C.I. = 10m
X
Y
.
.20
2040
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3010
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YX0
3040
1020
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Step 4: Transfer the points from the paper to the bottom of the grid..
203010
3040 1040
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21 30 4 km
ocea
n
Riv
er N
ile
C.I. = 10m
X
Y
.
.20
2040
30
3010
10
YX0
3040
1020
50
1020 1030
3040 40 20
Step 4: Transfer the points from the paper to the bottom of the grid..
21 30 4 km
ocea
n
Riv
er N
ile
C.I. = 10m
X
Y
.
.20
2040
30
3010
10
YX0
3040
1020
50
1020 1030
3040 40 20
Step 5: Mark off the corresponding elevation for each points on the grid and connect the points with a smooth curved line.
That is what a map profile
looks like.
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3040
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3040 40 20
This is what a topographic
profile looks like.
Profiles are never shaded in but the next slide is shaded to give a more dramatic effect of the topography.
21 30 4 km
ocea
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C.I. = 10m
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.20
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3010
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YX0
3040
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1020 1030
3040 40 20
21 30 4 km
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C.I. = 10m
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YX0
NAME: ______________________ DATE: _________
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