Geographic Information System (GIS)
A computing program that stores geographic data and produces maps to show the data.
Global Positioning System (GPS)
Uses satellites to determine the exact location on the global grid.
International Date Line
An imaginary line on the surface of the earth following (approximately) the 180th meridian. 180 longitude.
An imaginary line around the Earth parallel to the equator.
Two sets of lines that cross each other, as on a map.
The process of map making.
North, South, East, West
Northwest, Northeast, Southwest, and Southeast.
Right, Left, Up, Down
Displays the world with slight distortions on all four properties. Projection that attempts to balance several possible projection errors. It does not maintain completely accurate area, shape, distance, or direction, but it minimizes errors in each.
Projects the shapes accurately but distorts the size. Examples include Greenland which is the size of Africa.
A cylindrical map projection that attempts to retain the accurate sizes of the world's landmasses.
Equal Area Projections
Maps maintain area but distort other projections.
Maps that maintain shape but distort other properties.
Maps that maintain direction but distort other properties.
Maps that maintain distance but distort other properties.
Maps drawn from memory.
The space within which daily activity occurs.
A collection of information from satellites and distant collection systems.
Compares a distance on a map with a distance in the real world.
Shows common features such as boundaries, roads, highways, mountains, and cities.
Focuses on one feature, such as climate, city size, or number of alligators.
Isoline Thematic Map
Shows elevation level by displaying lines that connect points of equal value.
Choropleth Thematic Map
Shows a pattern of some variable, such as population density by using a variety of colors and shading.
Proportional Symbolic Thematic Map
Uses a symbol to display the frequency of a variable. The larger the symbol on the map the higher the frequency.