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Intro & Data
Lesson 7 Spatial Analysis
Term | Definition |
---|---|
Geographic Information System (GIS) | Computerized mapping system |
Spatial Data | Data that has a spacial reference (coordinate system, etc.) |
Topographic Map | Two-dimensional representation of a portion of the three-dimensional surface of the earth |
Global Positioning Systems (GPS) | System of satellites, computers, and receivers that is able to determine the latitude and longitude |
Topographically Integrated Geographical Encoding and Referencing (TIGER) | Uses for Census data Includes streets, railroads, zip codes, and landmarks Often used as a base layer |
Digital Aerial Photography | Photographs taken (usually) from an airplane |
Digital Elevation Models (DEMs) | Show digital data about the elevation of the earth's surface as it varies across communities allows planners to analyze and map it Can be used storm water management, flood control, land use and other purposes |
Light Detection and Ranging (LIDAR) | New technology using a laser that is mounted in an airplane to provide detailed topographic information |
UrbanSim | Simulation software program that models planning and urban development |
CommunityViz | Software program that allows agencies to create 3D images |
Geodesy | Measure and representation of the earth |
Datum | Approximation of earth surface (geoid) as an ellipsoid to compute location |
Projections | Mathematical transformation from ellipsoid to plane Projects distort at least one of these characteristics: shape, distance, direction or land area Most common: conic & cylindrical |
Types of Projections | Conformal: shape Equal Area: Area Equidistance: distance True Direction: Direction |
Four Fundamental Characteristics of Mapping | Shape Distance Direction Land Area |