It is a representation of something (Earth, stars, solar system, a building, etc…
To determine where you are going.
To act as a model of Earth’s surface.
Used to locate various places
To show the distribution of various features or types of materials.
Measured in degrees North and South of the Equator.
Lines drawn parallel to each other running west to east.
Quick Review of Latitude and Longitude
Measured in degrees East or West of the prime meridian.
Lines drawn running North and South.
The lay of the land.
Shows relief using contour lines.
Relief- highs and lows of Earth’s surface.
Relief can be calculated
Take the difference between the highest point and the lowest.
Ex: Mountain peak 20 m. lake 10m
20m- 10m= 10m
The relief of this area is 10m
Lines on topographic maps.
Connect points of equal elevation.
Everything connected to that line has the same elevation.
Elevation- the distance something is above sea level. Sea level= 0m or 0ft.
Contour interval- gives the difference in elevation between 2 contour lines.
Another indicator of height.
Shown on maps as C.I.= 10ft.
Used to count contour lines.
How it will look on a map
A index contour is a contour line that is accentuated in thickness and is labeled with the appropriate measure of elevation.
Index contours occur every fifth contour line.
Help the map user read elevations on a map.
Red arrows indicate location of index contours.
The direction a streams is flowing is shown on a topographic map by the way a contour line crosses the stream.