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Type: Journal article
Title: Appropriate surveying methods in the Philippines: can modern GPS unit help?
Author: Gordon, M.
Cedamon, E.
Citation: Annals of Tropical Research, 2007; 29(1):33-38
Publisher: Visayas State College of Agriculture
Issue Date: 2007
ISSN: 0116-0710
Statement of
Melissa Gordon, Edwin Cedamon
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.
Keywords: Global positioning system; geographic information system; compass and chain survey
Rights: Copyright status unknown
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Appears in Collections:Agriculture, Food and Wine publications
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