projections, datum, and coordinate systems
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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Projections, Datum, and Coordinate Systems
Module 1
Created by: Scott Kelly 2010
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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
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Based on Geodetic Datum
Describe locations in two or three dimensions (ie. X,Y,Z or X,Y)
Local and Global
Common systemsGeodetic Lat, Long (global)UTM (local)State Plane (local)
Variety of transformation methods
Coordinate Systems
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Geographic Coordinate Systems Projected Coordinate Systems
Coordinate Images Source: ESRI
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Image Source: http://commons.wikimedia.org/wiki/Category:USGS_projections
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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)
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Data in Google Earth (Plate Carree)
Data in ArcMap(AZ State Plane)
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Global Positioning Systems (GPS) Spatial Location Method:
TriangulationSatellite A Satellite B
Satellite C Satellite D
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Image Source: Telluride Ski Area
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These are way
off
These aren’t too
bad
Arctoolbox
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Any Questions?
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Please Contact:Mark Manone
Training Facility Coordinator [email protected]
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