GPS Communication Software. Mapping Program. Tarpits and Tips. Tools of the Trade . GPS. Tools of the Trade - Part IV. Tarpits and Tips. TIPS. Outline. Datums Error, Accuracy, and Precision Map Scale and Errors Tips for Managing GPS Error Better Maps for GPS. GPS Datum Tarpit.
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Tarpits and TipsTools of the Trade
Tarpits and Tips
0.13milesShift Happens - Florida Example
Comms between GPS users
Comms between GPS and Maps
Example: dispatch in one datum, you read off in another
In the GIS
Projecting data on top of GIS data
Example: You set DNRGarmin Projection to UTM 10 NAD83, but your GIS is in UTM 10 NAD27When Datums Matter
400 feet off
Display set to NAD27
They Expect WGS84
Set Projection in DNR Garmin to NAD27
Always Stores in WGS84
Working in NAD27
Aviation GPS is always WGS84
Kenneth E. Foote and Donald J. Huebner, The Geographer's Craft Project, Department of Geography, The University of Colorado at Boulder.
1.) Accuracy: how close to truth or accepted values.
2) Precision: how repeatable or consistent
Accurate + Precise
= Low Error !
3.) Error: includes both the imprecision of data and its inaccuracies
Mapsource data is 1:100,000 scale
+/-26 ' (open)