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Accuracy and signal reception of a hand-held Global Positioning System (GPS) receiver

S.P. D'Eon

Document Type

Article

Journal/Book Title/Conference

Forestry Chronicle

Volume

71

Issue

2

First Page

192

Last Page

196

Publication Date

1995

Abstract

Accurate and precise repolting of forest survey locations is required to integrateforest survey data with Geographical Information Systems. The accuracies of five Global Positioning System (GPS) survey methods using a hand-held receiver were tested in a mixed for- est of trembling aspen and spruce. Accuracy improved by elim- inating positions obtained under poor satellite configurations and by using position averaging methods. Single fix positions, tak- ing as little as two minutes to obtain, yielded better than accu- racy more than 80% of the time. Mowing the receivertocontjnu(~1~1y collect fixes for 15 to 30 minutes and then averaging the fixes yield- ed a median position error of 17 m. Sixty one stands represent- ing a diversity of cover types, canopy heights, and crown closure in the Petawawa Research Forest were tested during June and July of1992forcanopyinterferencewithGPSsign&, AGPSposi- tion was obtained under the canopy in 74% of the stands. Launches of additional GPS satellites since the summer of 1992 have further improved the probability of obtaining accurate gee- graphical positions under forest canopies.

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