Mapping

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Slide 1

Mapping

Slide 2

What is a map?

It is a representation of something (Earth, stars, solar system, a building, etc…

Slide 3

Uses of Maps

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.

Slide 4

Quick Review of Latitude and Longitude

Latitude

Measured in degrees North and South of the Equator.

Lines drawn parallel to each other running west to east.

Slide 5

Quick Review of Latitude and Longitude

Longitude

Measured in degrees East or West of the prime meridian.

Lines drawn running North and South.

Slide 6

Topography

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

Slide 7

Reading a topographic map- Contour Lines

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.

Slide 8

Reading a topographic map- Contour Intervals

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.

C.I.= 1000ft

How it will look on a map

Slide 9

Reading a topographic map- Index Contours

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.

Slide 10

Reading a topographic map- Streams

The direction a streams is flowing is shown on a topographic map by the way a contour line crosses the stream.