Appropriate surveying methods in the Philippines: Can modern GPS units help?

Gordon, M. and Cedamon, E. (2007) Appropriate surveying methods in the Philippines: Can modern GPS units help?. Annals of Tropical Research, 29 1: 33-38.

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Author Gordon, M.
Cedamon, E.
Title Appropriate surveying methods in the Philippines: Can modern GPS units help?
Journal name Annals of Tropical Research
ISSN 0116-0710
Publication date 2007-07-30
Sub-type Article (original research)
Open Access Status File (Author Post-print)
Volume 29
Issue 1
Start page 33
End page 38
Total pages 6
Editor Jack Baynes
Victor B. Asio
Place of publication UQ, Gatton
Publisher The University of Queensland
Collection year 2008
Language eng
Subject 300000 Agricultural, Veterinary and Environmental Sciences
Abstract An investigation was undertaken to test the effectiveness of two procedures for recording boundaries and plot positions for scientific studies on farms on Leyte Island, the Philippines. The accuracy of a Garmin 76 Global Positioning System (GPS) unit and a compass and chain was checked under the same conditions. Tree canopies interfered with the ability of the satellite signal to reach the GPS and therefore the GPS survey was less accurate than the compass and chain survey. Where a high degree of accuracy is required, a compass and chain survey remains the most effective method of surveying land underneath tree canopies, providing operator error is minimised. For a large number of surveys and thus large amounts of data, a GPS is more appropriate than a compass and chain survey because data are easily up-loaded into a Geographic Information System (GIS). However, under dense canopies where satellite signals cannot reach the GPS, it may be necessary to revert to a compass survey or a combination of both methods.
Keyword global positioning system
geographic information system
compass and chain survey
Leyte Island
survey instruments
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Created: Mon, 30 Jul 2007, 12:06:28 EST by Annerine Bosch on behalf of School of Integrative Systems