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Integrating GPS and GIS Technologies into 4-H Youth Programs. Michael J. Buschermohle Precision Agricultural Specialist University of Tennessee Extension. Overview. What is Global Positioning System (GPS) How GPS works Types of GPS receivers What is a Geographic Information System (GIS)

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Integrating gps and gis technologies into 4 h youth programs l.jpg

Integrating GPS and GIS Technologies into 4-H Youth Programs

Michael J. Buschermohle

Precision Agricultural Specialist

University of Tennessee Extension


Overview l.jpg
Overview

  • What is Global Positioning System (GPS)

  • How GPS works

  • Types of GPS receivers

  • What is a Geographic Information System (GIS)

  • Integrating GPS and GIS into 4-H programs


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What is GPS

GPS is a navigational system that can accurately locate your position anytime, anywhere, and regardless of weather on Earth

  • Satellite-based navigation systems made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense

  • Satellites orbit the earth at an altitude of about 12,500 miles

  • Radio signals from the satellites can be used to determine accurate georeferenced position information


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Satellite Signal

Satellites broadcast several pieces of information

  • Emphemeris (Orbital) data

  • Timing data


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How Does GPS Work

Speed of light = 186,000 mi/sec



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Sources of GPS Error

  • Clock Errors

  • Atmospheric Interference

  • Ephemeris (Orbital) Variation

  • Satellite Configuration

  • Signal Multipath


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Sources of GPS Error

Clock Errors

Let’s put some numbers on it

Altitude = 12,500 mi.

Speed of light = 186,000 mi/sec

Transmission Time = 0.067 sec

What happens if we are off a little?

0.001 sec * 186,000 mi/sec = 186 mi


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Sources of GPS Error

Atmospheric Interference


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Sources of GPS Error

Ephemeris (Orbital) Variation


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Sources of GPS Error

Satellite Configuration

Good (low) DOP

Poor (high) DOP

Measure of the geometrical strength of the GPS satellite configuration


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Sources of GPS Error

Signal Multipath


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Counteracting GPS Errors

  • Land-Based Differential Correction

  • Satellite-Based Differential Correction

  • User Base Station RTK Correction


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)

)

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)

)

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Counteracting GPS Errors

Land-Based Differential GPS Correction

Coast Guard

Beacon

Differential Correction Codes


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Counteracting GPS Errors

Satellite-Based Differential GPS Correction

Differential Correction Codes

WAAS

Omnistar

Deere


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Counteracting GPS Errors

Kinematic Differential GPS Correction

Operator’s

Base

Station

Differential Correction Codes



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Basic Navigation Information Supplied by GPS Receivers

  • Your current position

    • Coordinates (Latitude and Longitude, UTM, etc.)

  • Elevation

  • Direction to specified waypoints

  • Distance to specified waypoints

  • Your speed of travel

  • Your direction of travel


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    Geographic Information Systems (GIS)

    GIS is a collection of computer hardware, software, and geographic data for capturing, managing, analyzing, and displaying all forms of geographically referenced information.


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    GIS Maps are Based on Layers

    Rivers

    Capitals

    Roads

    States

    Lakes


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    Integrating GPS and GIS Technologies into 4-H Youth Programs

    • What Type of GPS receiver should you buy?

    What is your application?


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    GPS Applications

    • Teaching users about GPS receivers

    • Hiking

    • Geocaching

    • Nature Study

    • Hunting

    • Fishing

    • Boating

    • Biking

    • Skiing

    • Golf


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    Low Cost (Handheld) GPS Receivers

    Cost $100 – $400

    Features

    Internal Memory 8 – 30 M

    SC Card Expandability

    Mapping Software Compatibility


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    Mapping Software

    Cost $100 - 150

    Compatibility depends on the unit


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    GPS Applications

    • Collecting geo-referenced data

    • GIS Mapping



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    Integrating GPS and GIS Technologies into 4-H Youth Programs

    What GIS software should you buy?


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    GIS Software

    • ESRI

      • ArcMap

      • ArcPad for Windows CE

    • Farm Works

    • Map Shots

    • JD Office

    • Easy Suite


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    On-Line Training Course“Learning How to Use ArcPad 7.0”


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    On-Line Training Course“Learning How to Use ArcPad 7.0”

    Learning Module 1: Moving Data to and From Your PDA

    Learning Module 2: Getting to Know ArcPad

    Learning Module 3: Displaying Data

    Learning Module 4: Creating Features

    Learning Module 5: Using Your GPS Receiver

    Learning Module 6: Capturing Features Using Your GPS Receiver

    Learning Module 7: Making Your Map Look Pretty

    Learning Module 8: Retrieving Information from Your Map



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    Some GPS Applications for Youth

    Collecting and Mapping Geo-referenced data in Your Community



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