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olivia hackett

on 16 September 2013

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Transcript of Topography

A landform is a feature of topography, such as a hill or a valley. Different landforms have different combinations of elevation and relief. The three main landforms are plains, mountains, and plateaus. A mountain range is a group of mountains that are similar in size and shape.
Types of Landforms
A plain is a landform made up of nearly flat or gently rolling land with low relief. A mountain is a landform with high elevation and high relief. A mountain range is a group of mountains. A landform that has high elevation and a level surface is a plateau.
Elevation and Relief
The height above sea level of a point on Earth's surface is its elevation. Relief is the difference in elevation between the highest and lowest points in an area.
The topography of an area includes elevation, relief, and landforms.
What is Topography?
Maps and Globes
Maps and globes are drawn to scale and use symbols to represent topography and other features on Earth's surface.
Equator and Prime Meridian
Two of the lines that make up the grid, the equator and the prime meridian, are the baselines for measuring distances on Earth's surface. The equator goes from west to east and the prime meridian goes from North to South.
Latitude and Longitude
The lines of latitude and longitude form a grid that can be used to find locations anywhere on Earth.
Map Projections
Three common map projections are the Mercator projection, the equal-area projection, and the conic projection.
G.P.S. stands for Global Positioning System. A G.P.S. can locate anything on Earth using satellites in space that orbit around the earth.
With computers, mapmakers can store, process, and display map data electronically.
Contour Lines
Mapmakers use contour lines to represent elevation, relief, and slope. Wider curves represent gentler slopes, while closed loops represent hilltops.
Topographic Maps
Topographic maps have many uses in science, engineering, business, government, and everyday life.
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