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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

Integrating GPS and GIS Technologies into 4-H Youth Programs

Michael J. Buschermohle

Precision Agricultural Specialist

University of Tennessee Extension

overview
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
slide3

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
satellite signal
Satellite Signal

Satellites broadcast several pieces of information

  • Emphemeris (Orbital) data
  • Timing data
how does gps work
How Does GPS Work

Speed of light = 186,000 mi/sec

sources of gps error
Sources of GPS Error
  • Clock Errors
  • Atmospheric Interference
  • Ephemeris (Orbital) Variation
  • Satellite Configuration
  • Signal Multipath
slide8

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

sources of gps error9
Sources of GPS Error

Atmospheric Interference

sources of gps error10
Sources of GPS Error

Ephemeris (Orbital) Variation

sources of gps error11
Sources of GPS Error

Satellite Configuration

Good (low) DOP

Poor (high) DOP

Measure of the geometrical strength of the GPS satellite configuration

slide12

Sources of GPS Error

Signal Multipath

counteracting gps errors
Counteracting GPS Errors
  • Land-Based Differential Correction
  • Satellite-Based Differential Correction
  • User Base Station RTK Correction
counteracting gps errors14

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Counteracting GPS Errors

Land-Based Differential GPS Correction

Coast Guard

Beacon

Differential Correction Codes

counteracting gps errors15
Counteracting GPS Errors

Satellite-Based Differential GPS Correction

Differential Correction Codes

WAAS

Omnistar

Deere

counteracting gps errors16

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Counteracting GPS Errors

Kinematic Differential GPS Correction

Operator’s

Base

Station

Differential Correction Codes

slide18

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
slide19

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.

slide20

GIS Maps are Based on Layers

Rivers

Capitals

Roads

States

Lakes

slide21

Integrating GPS and GIS Technologies into 4-H Youth Programs

  • What Type of GPS receiver should you buy?

What is your application?

slide22

GPS Applications

  • Teaching users about GPS receivers
  • Hiking
  • Geocaching
  • Nature Study
  • Hunting
  • Fishing
  • Boating
  • Biking
  • Skiing
  • Golf
slide23

Low Cost (Handheld) GPS Receivers

Cost $100 – $400

Features

Internal Memory 8 – 30 M

SC Card Expandability

Mapping Software Compatibility

slide24

Mapping Software

Cost $100 - 150

Compatibility depends on the unit

slide25

GPS Applications

  • Collecting geo-referenced data
  • GIS Mapping
slide28

GIS Software

  • ESRI
    • ArcMap
    • ArcPad for Windows CE
  • Farm Works
  • Map Shots
  • JD Office
  • Easy Suite
slide30

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

slide32

Some GPS Applications for Youth

Collecting and Mapping Geo-referenced data in Your Community

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