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Chapter 3 Topographic Maps Topography Means: “Shape of the land”

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Presentation on theme: "Chapter 3 Topographic Maps Topography Means: “Shape of the land”"— Presentation transcript:

1 Chapter 3 Topographic Maps Topography Means: “Shape of the land”

2 Contour Lines Indicate areas of equal elevation Will never cross or divide

3 Hill top – Circles within circles Specific points are called Benchmarks

4 Contour interval Distance between contour lines 500’

5 Contour Interval Contour Interval = 500’

6 Indicating all contour lines make it look cluttered – Index Contour Lines To get C.I. : Take the Change in Elevation between two contour index lines and divide that by the number of lines between them.C.I. = 250’

7 You Try!!! Map A – C.I. = Map B – C.I. =

8 Benchmark: Exact elevation Marker

9 Close lines = steep slope

10 What do you think it looks like from the side? ?

11 Closed depressions on the land are shown by contour lines with “hachure lines” that point down slope. (indicate holes or craters)

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13 6. A contour line forms a “V” shape pointing upstream when crossing a river or stream. Downhill!!! “V” Shaped Contour Lines

14 Steep vs Gentle River Direction

15 Gradient = Average rate of slope Determined by change in elevation divided by distance. Rise over Run! A B Scale (km) 1km Elevation Change (rise)= Distance (run)=

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17 Topographic Profiling A line that shows the changes in elevation across a section of a topographic map.

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21 Contouring: Elevation points have been determined using ground surveying techniques or GPS but contour lines need to be drawn in.

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