created by: scott kelly 2010. original image source: esa
TRANSCRIPT
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Introduction to
Global Positioning Systems (GPS)
Module 1
Created by: Scott Kelly 2010
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1. Satellites2. Receiver/Unit3. Ground Control4. Computers5. Human Element
A Global Positioning System (GPS) includes:
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Original image source: ESA
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Very high orbit– 12,550 miles (20,200 km)– 1 revolution in about 12 hrs– Travel approx. 7,000mph
Considerations– Accuracy – Geometry– Coverage
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The OmnipresentGPS Receiver
Image Source: Cabalas
Image Source: Trillium Wood Golf Club
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Image Source: GPSinformati on.org
Satell ites Map Waypoints/Tracks
MenuNavigati on
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Image Source: USGS
Image Source: Schriever Air Force Base
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Image source: Golf-Monthly
Image Source: fanpop.com
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Purpose Tool Direction Interaction User
The Human Element
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How Global Positioning Systems
Work
1. Datum & Projections2. Data Collection3. Unit to Computer
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11
Geodetic Datum: What are they?
Define the size and shape of the earth
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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Triangulation
Satellite A Satellite B
Satellite C Satellite D
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Image Source: topofusion.com/jamboree
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Image Source: http://www.4x4books.com/mttngps.htm
Unit to Computer
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Original Image Source: Wired.com
Image Source: http://www.leica-geosystems.com/en/News-Archive_57049.htm?id=1319
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GPS/GISApplying the field
Image Source: http://202.28.94.55/web/322103/2551/work1/g178/home.html and others
Image Source: blog.doc.govt.nz/2009/08/