Download contour lines - Milan Area Schools

Note 11
Topographic Maps Cont....
Map Scales: Tells you how much surface
area is covered by map
Fractional Map Scale: i.e. 1:24,000 means
that 1 inch of map equals 24,000 inches on
Earth
Graphic (Bar) Scale: shows relationship
between map and distance on Earth like
miles or km ex. 1 inch = 20 miles
This bar scale tells you that how much of
map is equivalent to 1 mile
Latitude: Angular distance North or South of
Equator
Longitude: Angular Distance East or West from
Meridian (Reference Pt: Greenwich, England)
Latitude
- Lines of latitude are circular bands
running east and west parallel to the
equator.
- Lines of latitude are designated from
zero to 90 degrees north and south of the
Equator.
Longitude
- Lines of longitude are circular bands which
run north and south through the two poles.
- Lines of longitude are designated from zero
to 180 degrees east and west of the
Greenwich Observatory in London, England.
Contour Lines on Topographic Maps
* Contour lines mark areas of equal elevation
Rules:
1. Never branches or splits
2. Steep slopes = closely spaced contour lines
3. Never cross but can merge to show a cliff
4. Hills are pictured by concentric circles of
contour lines
5. Craters or depressions are marked with
closed circles with hatch marks
6. Contour lines that cross stream channels
form a “V” that points upstream
Related Info:
A. Slope= elevation change ÷ distance for
elevation change
Ex. Mtn rises 500 ft in 2 miles
slope = 250 ft / mile
B. Relief= Difference in elevation between
highest and lowest point on map
Ex. ( Death Valley, Telescope Peak = 11,014'
Badwater
=
-23'
Relief is 11,037 ft