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Basic Concepts 1.1


Map A two-dimensional or flat-scaled model of Earth's surface, or a portion of it
Cartography The science of mapmaking
Map Scale Refers to the relationship of a feature's size on a map to it's actual size on Earth
Ratio or Fraction Shows the numerical ratio between distances on the map and Earth's surface
Written Scale Describes the relationship between map and Earth distances in words
Graphic Scale Usually consists of a bar line marked to show distance on Earth's surface
Projection The scientific method of transferring locations on Earth's surface to a flat map
Meridian An arc drawn between the North and South poles
Longitude A numbering system on a map
Prime Meridian 0 degrees longitude, passes through the Royal Conservatory at Greenwich, England
Parallel A circle drawn around the globe parallel to the equator and at right angles to the meridians.
Latitude The numbering system to indicate the location of a parallel
Greenwich Mean Time Also known as Universal Time, is the time at the prime meridian, is also the master reference time for all points on Earth
International Date Line Follows 180 degree longitude, when you cross it eastward toward America, you move the clock back 24 hours or one full day
Geographic Information Science The development and analysis of data about Earth acquired through satellite and other electronic information technologies
Remote Sensing The acquisition of data about Earth's surface from a satellite orbiting Earth or from other long-distance methods
Geographic Information System A computer system that captures, stores, queries, analyzes, and displays geographic data
Created by: debelakm21