Instruments of the Exchange.


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Comms between GPS clients. Comms in the middle of GPS and Maps. Case: dispatch ... Will your Garmin GPS MAP76 meet Mapping Accuracy measures for a 1:24,000 scale item ...
Transcripts
Slide 1

GPS Communication Software Mapping Program Tarpits and Tips Tools of the Trade GPS

Slide 2

Tools of the Trade - Part IV Tarpits and TIPS

Slide 3

Outline Datums Error, Accuracy, and Precision Map Scale and Errors Tips for Managing GPS Error Better Maps for GPS

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GPS Datum Tarpit What\'s the major ordeal? A football field of contrast on the off chance that you are incorrect! Consider the possibility that you\'re on the wrong side of the edge. On the other hand more terrible… the valley!! SHIFT HAPPENS!

Slide 5

Datum Shift 0.13miles Shift Happens - Florida Example

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Shift Happens - Redmond OR 2005 Example 710 Feet

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In the Field Comms between GPS clients Comms amongst GPS and Maps Example: dispatch in one datum, you read off in another In the GIS Projecting information on top of GIS information Example: You set DNRGarmin Projection to UTM 10 NAD83, yet your GIS is in UTM 10 NAD27 When Datums Matter

Slide 8

Written or Spoken Datum MISMATCH Them You 400 feet off Display set to NAD27 They Expect WGS84

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Transfer to GIS Set Projection in DNR Garmin to NAD27 GIS GPS Always Stores in WGS84 Working in NAD27

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GPS Datum Tips Summary: Check, check, check When Downloading with DNR Garmin, Always check "Set Projection" to coordinate your GIS ASK! When you hear WGS84, with your scale, it\'s the same as NAD83 Aviation GPS is dependably WGS84

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Error, Accuracy, and Precision Importance Safety Make or break a GIS venture Learn approaches to keep GPS mistakes to a base Be mindful of the issues Kenneth E. Foote and Donald J. Huebner, The Geographer\'s Craft Project, Department of Geography, The University of Colorado at Boulder.

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Basic Definitions 1.) Accuracy: how near truth or acknowledged qualities. 2) Precision: how repeatable or predictable

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Basic Definitions Accurate + Precise = Low Error ! 3.) Error: incorporates both the imprecision of information and its mistakes

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Map Scale Accuracy and Precision for a guide are a component of the scale at which the guide was made Applies for computerized or paper National Mapping Accuracy Standards utilized by USGS

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Map Accuracy Standards 1:2,400 ± 6.67 feet 1:24,000 ± 40.00 feet 1:63,360 ± 105.60 feet 1:100,000 ± 166.67 feet

Slide 16

Map Scale and the Garmin Will your Garmin GPS MAP76 meet Mapping Accuracy guidelines for a 1:24,000 scale item (+/ - 40\')? What about 1:63,360 (+/ - 105\')? Recently, we addressed that inquiry?

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Sources of Map Errors Age of Data Map Scale Mapsource information is 1:100,000 scale Digitizing Errors

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Tips for Managing GPS Error Metadata Average all Points Fresh batteries External Antenna All else comes up short Map and Compass

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Tips for Managing Error Staying As Accurate as could be expected under the circumstances +/ - 26 " (open)

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Tips for Managing GPS Error Record Metadata: Who, What, Why

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Managing GPS Error Try to normal focuses 60 focuses

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Managing GPS Error If in the trees, turn off WAAS Position can be surprisingly more dreadful. Continuously take a 3D position over a 2D Differential!

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Managing GPS Error Try to utilize Antenna when conceivable A Map76 under Canopy gets twice as exact with an outer radio wire Use Sleeve mounts on the off chance that you need to When mounting in vehicle, use sections

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GPS Accessories Maps Compass GOTO: Distance Bearing

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Ideal GPS Accessories Extra AA batteries Case ($14.00)* holds links, cameras, batteries *Available www.gpsoutfitters.com

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Make Great Maps Practice Collecting Good Data in the field Pass onto others just critical stuff Make your information secure

Slide 27

Future Firefighters

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Summary Importance of Datums How blunder free would you say you are? By overseeing blunder you can beat the chances

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