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GPS - The Big Picture. 2004. Overview. Introduction - Show GPS Movie GPS and the Big Picture Accuracy Review of GPS Receiver Types Why the Garmin GPSMap76 Receiver. Show GPS Movie Movie is found on your CD < Presentations/GPSMovie Requires Acrobat Version 4 – on CD.

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Overview l.jpg
Overview

  • Introduction - Show GPS Movie

  • GPS and the Big Picture

  • Accuracy

  • Review of GPS Receiver Types

  • Why the Garmin GPSMap76 Receiver


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  • Show GPS Movie

    • Movie is found on your CD

      <Presentations/GPSMovie

      Requires Acrobat Version 4 – on CD


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Why do “Ologists” Need GPS?

  • Spatial location is a critical component in all field work


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Why do Ologists Need GPS?

  • Field work is done outside in remote locations where map information could be out of date, too large of spatial scale

  • Ologists are retiring and locations of stuff are not being archived


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What Can You Do With GPS?

  • Accurately and precisely record sites within 4 meters

    • 1m or better with other GPS

  • Navigate to locations pre-determined by others

  • Record the path you took and play it back later (make a map in the GIS)


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GPS Myths

  • GPS does not work in the far north

  • Selective Availability will be turned back on

  • I Just turn my GPS on and never check settings - it just works!!

  • GPS is only a “Field” thing


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Overview

  • Introduction - Show GPS Movie

  • GPS and the Big Picture

  • GPS Accuracy

  • Review of GPS Receiver Types

  • Why the Garmin GPSMap76 Receiver


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GPS - The Big Picture

Trails

Glacier Moraines

Streams


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GPS - The Big Picture

  • GPS Data for Maps

    • Original Mapping

    • What’s out there?

    • Updating

    • Databases


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You Are The Big Picture

Archive of Park Stuff!

Create/Obtain

New Data

Distribute Data

To Parks

Distribute To

W W W


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8 m

How Accurate is GPS

  • Today…

    • GPS manufacturers quote about 50 ft (17m)

    • ...but were getting 26 ft (8m) fairly reliably with good sky

Even Better!


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Accuracy Comparisons – Open*

95% - XY

Garmins

Garmin V

3 m

III Plus

4 m

Map76

4 m

*Test sites used on this slide: Garmin V(NPS Bakerville); Garmin III+/Map76 (MTDC)


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Accuracy Comparisons – Open*

95% - XY

Trimble

Geo 3

2 m

Geo XT

0.9 – 1.6 m

Pro XR

0.6 m

*Test sites used on this slide: Geo3 / GeoXT (1.6mMTDC); ProXR (Estacada). NOTE: GeoXT accuracy of 0.9 reported by NPS – Bakersville RT



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GPS Under Canopy

  • Garmins17 – 20 meters

  • Trimble3 – 8 meters

Watch Out



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Which Tool for the Job

  • Jobs for the Garmin

  • Jobs for the Trimble


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Garmin Jobs

  • Bering Land Bridge - Drum Recovery and Disposal


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Garmin Jobs

  • Aerial Mapping

    • Fire Perimeters

    • Airstrips

    • Animal locations


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Garmin Jobs

  • Camp Sites

    • Using Photos to record site Conditions

    • Linking photos with location in GIS


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Which Tool for the Job

  • Jobs for the Garmin

  • Jobs for the Trimble


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Trimble Jobs

  • Utility Mapping


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Location D

Trimble Jobs

  • Multi-Feature Mapping

    • Soil sample sites

    • Tree Core Locations


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Trimble Jobs

  • Trail Mapping / Condition


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Which Tool For the Job

  • Summary

    • Garmin Jobs are for open country, “site locating”, simple maps

    • Trimble Jobs for GIS base mapping, feature rich environments and areas with difficult GPS conditions


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  • Mode of Collection

  • Environment

25 acres

10 mile perim.

  • Quantity of Units

  • Moving Targets

  • Other Duties

Unique Aspects of Ologist Mapping


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Quick Review of GPS Types

  • Recreational Grade

  • Mapping / GIS Grade


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  • Survey Grade

    • Boundaries, Precise Control Networks, Vertical Measurements

Review of GPS Receiver Types


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Quick Review of GPS Types

  • Recreational Grade

    • Navigation, Basic Mapping, Fun

    • Designed to Download into TOPO mapping programs – lightweight GIS


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Quick Review of GPS Types

  • Mapping/GIS Grade

    • GIS Features and Attributes


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PLGR’s

  • Retired PLGRS in April 2003

  • Only 3 left in Alaska Parks

  • Software Improvements make PLGRs obsolete


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Differential GPS (DGPS)

  • Differential GPS

    • A method of improving accuracy by adding a local reference station to augment information available from satellites

    • Provided by

      • Coast Guard Beacons (Realtime)

      • WAAS


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DGPS - Coast Guard Beacons

  • Sounds great but…

    • Limited coverage

    • KEFJ, LACL, KATM, SE AK

Coast Guard DGPS Beacons


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DGPS - Satellite Based - Realtime

  • WAAS

    • 2 Equatorial satellites

    • Broadcast corrected signals

    • Designed for aircraft

    • Limited coverage in Alaska

    • poor under trees

Theoretical WAAS Coverage


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DGPS Review - Is it worth it?

  • For higher accuracy and precision - a must

  • Expect WAAS to increase broadcast area

  • Purchase WAAS in your next receiver and hope...


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Decision Factors for the Ranger GPS Tool

  • Accuracy

  • Cost (hardware)

  • Nerd Factor Scale


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Recreational Grade

  • Accuracy: 3meter - 7meter

  • Costs: $1500 - $150

  • Nerd Factor:

  • Storage: hours worth of data

  • Strategy: waypoints, simple lines, polys


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Mapping/GIS Grade

  • Accuracy: 1meter - 5meter

  • Costs: $10,000 - $3,000

  • Nerd Factor:

  • Storage: days worth of data

  • Strategy: GIS update


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Recreational Grade GPS Wins!

  • Reasonable accuracy for mapping large things

  • Low receiver cost

  • Low nerd scale

  • Strategy set to enhance navigation capabilities

  • Low attribution requirements


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Overview

  • Introduction - Show GPS Movie

  • GPS and the Big Picture

  • GPS Accuracy

  • Review of GPS Receiver Types

  • Why the Garmin GPSMap76 Receiver


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Recreational Grade GPS

  • Consumer Grade Manufacturers

  • Garmin

    • Recognized World Leader

    • High Support

Lowrance

Garmin

Magellan


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Garmin GPSMap 76

4 meters (open)

  • $400

  • 12 Channel GPS WAAS enabled

  • 8 MB of Map memory*

  • 10,000 track points

  • 10 hours of battery life

*Purchase of MapSource TOPO CD + $99


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Garmin GPSMap 76

  • Integrates well with GIS

  • DNR Garmin to ArcView is Fast and Efficient


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Garmin GPSMap 76

  • Unique Aspects

    • Antenna (Quadrifilar Helix)

    • It Floats

    • Averages waypoints

    • External Antenna capabilities


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Limitations - Garmin GPSMap 76

  • Weak Connection to External Antenna

  • Must hold UPRIGHT for best reception

    • Laying down on back produces poor data

    • Purchase a bracket if using in vehicles

  • Missing other features (Available in “S” Model:

    • Digital Compass

    • Altimeter


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Where to Go For More INFO

  • NPS Intranet:

    • Cheatsheets and Guidelines

      • http://web/rgr/gps/tips.htm

  • Internet:

    • http://www.nps.gov/gis/gps/aksogps/

  • GPS Toolkits

    • Your CD or

    • http://www.nps.gov/gis/gps/aksogps/



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Summary

  • GPS allows precise positioning anywhere in Alaska

  • Recreational grade GPS satisfies...

    • Moderate accuracy's

    • Low costs in hardware, training

  • A Garmin allows for navigation and simple site marking jobs for many “Ologists”


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Break

  • Coming Up

    • GPS Sky

    • Garmin Setup

    • Get Outside!


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