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Projections, Datum, and Coordinate Systems

Projections, Datum, and Coordinate Systems. Module 1. Created by: Scott Kelly 2010. Geodetic Datum: What are they?. Define the size and position of the earth relative to its center Used as basis for coordinate systems Variety of models: - Flat earth - Spherical - Ellipsoidal

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Projections, Datum, and Coordinate Systems

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  1. Projections, Datum, and Coordinate Systems Module 1 Created by: Scott Kelly 2010

  2. Geodetic Datum: What are they? • Define the size and position of the earth relative to its center • Used as basis for coordinate systems • Variety of models: • - Flat earth • - Spherical • - Ellipsoidal • WGS 84 defines geoid heights for the entire earth

  3. Coordinate Systems • Based on Geodetic Datum • Describe locations in two or three dimensions (ie. X,Y,Z or X,Y) • Local and Global • Common systems • Geodetic Lat, Long (global) • UTM (local) • State Plane (local) • Variety of transformation methods

  4. Projected Coordinate Systems Geographic Coordinate Systems Coordinate Images Source: ESRI

  5. Image Source: http://commons.wikimedia.org/wiki/Category:USGS_projections

  6. Data in Google Earth (Plate Carree) Data in ArcMap (AZ State Plane) Common issue of working between different databases, Datum, and Projections – Data sometimes does not line up or has conflicts

  7. Data in ArcMap (AZ State Plane) Data in Google Earth (Plate Carree)

  8. Satellite B Satellite C Satellite D Global Positioning Systems (GPS) Spatial Location Method: Triangulation Satellite A

  9. Image Source: Telluride Ski Area

  10. Arctoolbox These aren’t too bad These are way off

  11. Any Questions? Please Contact: Mark Manone Training Facility CoordinatorMark.Manone@nau.edu (928) 523-9159 “To map out a course of action and follow it to an end requires courage” Ralph Waldo Emerson

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