GIS3043_Lecture_15 - GIS3043C GISforEnvironmentalStudies...

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GIS3043C GIS for Environmental Studies Fall 2009 Michael J. Gilbrook, GISP, AICP Frank Salmon, GISP Lecture 15 Global Positioning System
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Fall 2009 Lecture #15 Number 2 Asset Management Water Resources Biological Resources Wetland Delineation Cultural Resources Insert picture GPS Used For Field Data Collection
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Fall 2009 Lecture #15 Slide  Number 3 Global Positioning System (GPS) System Overview Launched & operated by US Department of Defense About 24 satellites, plus spares High-inclination (near polar) orbits Orbital altitude about 20,000 km (12,000 miles) Accuracy With S/A* operational ~ 25 meters Without S/A ~ 10 m With WAAS Correction ~ 3 – 5 m With Ground Based Differential Correction Code-based receivers – less accurate (~ 1 m) Carrier-phase receivers – most accurate (~ 1 – 3 cm) * S/A = Selective Availability, intentional degradation of GPS accuracy by DoD
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Fall 2009 Lecture #15 Slide  Number 4 How GPS Locates Positions http://videos.howstuffworks.com/howstuffworks/38-how-gps-works-video.htm   http://www.aero.org/education/primers/gps/howgpsworks.html  
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Fall 2009 Lecture #15 Slide  Number 5 How GPS Locates Positions Satellite #1 Time = 0.0667 sec Distance = 20,000 km Satellite #2 Time = 0.0800 sec Distance = 24,000 km Satellite #3 Time = 0.0733 sec Distance = 22,000 km Location!
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Fall 2009 Lecture #15 Slide  Number 6 Survey Grade - ≤ 1 cm Accuracy* Typically used with a base-station Big, bulky and costly $20-30K If you need survey quality data, use a Surveyor Professional Quality - ≤ 1 meter* “Mapping Grade” Sometimes integrated with data collection device Accurate enough for most GIS work. Data includes  accuracy information Reasonably priced - $3K - 10K Recreational Quality – 3 - 5 meters * “Sportsman Grade” Small cell phone sized units Automobile navigation, fishing, photo points, general  site locations.
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This note was uploaded on 11/08/2011 for the course GIS 3043 taught by Professor Gilbrook during the Fall '10 term at University of Central Florida.

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GIS3043_Lecture_15 - GIS3043C GISforEnvironmentalStudies...

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