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

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Presentation transcript:

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

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

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

Coordinate Images Source: ESRI

Image Source:

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

Global Positioning Systems (GPS) Spatial Location Method: Triangulation

Any Questions? “To map out a course of action and follow it to an end requires courage” Ralph Waldo Emerson Please Contact: Mark Manone Training Facility Coordinator (928)