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Which GPS Should I Buy. Tips to Buying a GPS for Mapping . Garmin. Pro XR. GeoExplorer 3. Trimble. Joel Cusick Alaska Support Office. PLGR. Outline. What a GPS Mapping Receiver should do Overview of Main GPS Receiver Types PROS/CONS of Receiver Types

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Which gps should i buy l.jpg
Which GPS Should I Buy

  • Tips to Buying a GPS for Mapping

Garmin

Pro XR

GeoExplorer 3

Trimble

Joel CusickAlaska Support Office

PLGR


Outline l.jpg
Outline

  • What a GPS Mapping Receiver should do

  • Overview of Main GPS Receiver Types

  • PROS/CONS of Receiver Types

  • The Best Tool for the Job


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Assumptions

  • You supervise people or work in one/many parks in Alaska

  • You want to record your field locations or map existing infrastructure, trails

    • Use to navigate to/from

    • Archive the locations in a later in a GIS

  • You have access to the wonderful AKSO Intranet and the X:drive


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What a GPS Mapping Receiver should do

  • Hardware

  • Software

  • Support


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What a GPS Mapping Receiver should do

  • Hardware

    • Accuracy (How close to Truth)

      • Meet National Mapping Accuracy Standards:

        • 1:63,360 (32meters)

        • 1:24,000 (12 meters)

        • 1:5,000 (4 meters)

    • Precise (How reliable)

    • Rugged

    • Able to Average a Point

    • External Antenna options

    • Good on Batteries

No Problem!


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What a GPS Mapping Receiver should do

  • Software

    • Export in GIS Friendly Formats (shapes, coverages)

    • Capable of Controlling Attributes in the Field

      • Data Dictionary (Name, Trail Width, Comments)

    • Capable of Datum Transform

    • Mission Planning

      • Sky Plots

      • Planning the day

    • Run on standard PC / equipment


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What a GPS Mapping Receiver should do

  • Support (AKSO)

    • Manufactured by Trimble, Garmin or Rockwell

    • GIS Products that utilize ESRI - NPS Standard

      • ArcView

      • ArcInfo

    • Ensure your data has long shelf life


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Overview of Main Types

  • Recreational Grade GPS - Garmin

  • Mapping Grade GPS - Trimble

  • Y-Code Receivers - Rockwell PLGR+96


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Recreational Grade GPS - Garmin

  • Features Include:

    • Wide Use -Alaska National Parks/AKSO = 60

    • Accuracy:

      • Autonomous < 15meters 95% typical

      • DGPS ready 3-5 meters 95% typical

    • User Friendly

    • Many models

      • Garmin GPSIII+, GPSMap76, eTrex

    • Moving Base Maps (1:100,000 scale)

Garmin


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Mapping Grade GPS - Trimble

  • Features Include:

    • Wide Use -Nationally

    • AKSO (dozen)

    • Accuracy:

      • Autonomous < 15meters 95% typical

      • Post-Process DGPS

        • 3-5 meters 95% typical (Geo3)

        • 1 meter 95% typical (ProXR)

    • Pathfinder Office Software

      • Data Dictionary, Mission Planning

Trimble


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Y-Code Receivers - PLGR+96

  • Features Include:

    • Rugged

    • Good under Canopy

    • 999 Waypoint Storage

    • EHE displayed

    • Datum Switch seen in ASCII Out

PLGR


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GPS for GIS - Pros and Cons

  • Garmin III+

    • Pros

      • Cheap and consistent 15 meters positions - good under canopy

      • Good “Point tool”

      • Fun and easy to use

      • Integration into ArcView - relatively straightforward

      • Battery usage is great

    • Cons

      • Cheap

      • Position accuracy not so trustworthy

      • Not designed for GIS Mapping - relies on 3rd party software

      • No Data Dictionary capability

      • Decent storage of tracks/waypoints (6-10 hours)


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GPS for GIS - Pros and Cons

  • Trimble GeoExplorer 3

    • Pros

      • 1-5 meter mapping tool

      • Point/Line/Poly

      • Rugged

      • Collect for 16 hours

      • Software is excellent

    • Cons

      • $4000

      • Firmware will be changing?

      • Under Canopy issues - must use antenna

      • No Data Dictionary

      • Very small storage of tracks/waypoints(999)

      • Need to post-process after the field (internet connection)


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GPS for GIS - Pros and Cons

  • Trimble Pro XR

    • Pros

      • Top-of-the-line GIS Mapping Tool

      • Real-time DGPS

      • Point/Line/Poly

      • Good under Canopy

      • Rugged

      • Software is excellent

    • Cons

      • $10,000

      • Big/Bulky

      • Firmware will be changing

      • Training involved


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GPS for GIS - Pros and Cons

  • PLGR

    • Pros

      • Consistent 15 meters positions

      • Familiarity (bugs worked out)

      • Good “Point tool”

      • Rugged. Records error

      • Integration into ArcView - relatively straightforward

    • Cons

      • Older technology

      • Heavy

      • Terrible on batteries

      • Club Fed only

      • No Data Dictionary capability

      • Very small storage of tracks/waypoints(999)


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Right Tool for the Right Job

  • Sorry… It’s a Multi - Tool Environment

    • Garmin

    • Trimble

    • PLGR

  • Need to learn enough about each system to know when to use the tool

    • Mapping a trash can lid? - ProXR

    • Mapping a ATV trail - Garmin, Geo3 or ProXR

    • Mapping sheep from the air? - Garmin\PLGR

    • Mapping complex attributes? - Geo3 or ProXR

    • In Dense Canopy - PLGR / ProXR


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Ideal GPS Toolkits

  • Garmin for navigation, point collection

    • Use DGPS system only if working along Gulf of Alaska, Southeast, out on the water

  • PLGR for dense people / dense canopy

  • For Serious GIS

    • Trimble Geo3 for open country mapping

    • Trimble Pro XR for everything


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What is Best?

  • Ask Yourself

  • 1) What are your accuracy needs?

    • A) resolution of the other data types

    • B) anticipated data for the future

  • 2) Project Needs

    • A) What are your GIS skills

    • B) Is it just you dealing with the data

  • 3) What part of Alaska are you working in?

  • 4) How much money do you have?


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  • Embedded help sheets

GPS Toolkits


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GPS Training

  • Yearly training Events

    • Orienteering

    • Awareness Briefings

    • Training

      • WRST (May 14-17)

      • Accupoint (This summer)


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