The study of the shapes and features of the Earth’s surface. Map showing 3-dimensional shape and...
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Transcript of The study of the shapes and features of the Earth’s surface. Map showing 3-dimensional shape and...
RULES ofContour Mapping
TOPOGRAPHY• The study of the shapes and features
of the Earth’s surface.
TOPOGRAPHIC MAPS• Map showing 3-dimensional
shape and elevation of land in 2-dimensions
ELEVATION• Height above sea level
• All points on the same contour line have the same elevation.
#1. A contour line represents a single equal elevation.
A
B
DC
Commonly, every 5th line is darker and the elevation shown. This is the index contour.
#2. Where one closed contour line surrounds another,the inner contour line represents the higher elevation .
This is a contour map of a mountain.
#3. Elevation is determined by the contour line interval.
Question:What is the contour line interval here?
#4.Closely spaced contour lines =steep slope.
Widely spaced contour lines =gentle slope.
#5. Where a contour line crosses a stream or river, the contour line bends to form a “V” that points upstream.This is called the Rule of V’s
In what direction is the river flowing?
#6. Depressions are shown using hachure contour lines
The hachures point into the depression. (Hachures = short dashes)
A hachured contour line, lying between two different contour lines, is the same elevation as the lower contour line.
Count up Count down
Contour Elevation Repeats