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Forest canopy influence on the precision of location with GPS receivers

Author

Listed:
  • J. Tuček

    (Technical University, Faculty of Forestry, Zvolen, Slovak Republic)

  • J. Ligoš

    (Technical University, Faculty of Forestry, Zvolen, Slovak Republic)

Abstract

This article presents the results of a test of three GPS receivers of GIS category (Topcon Turbo G1, Topcon, Magellan ProMark X-CM, Magellan, March II-E, Corvalis Microtechnology) in location under the entire cover of forest canopy. A network of 111 experimental points was established in the territory of Training Forest Enterprise (TFE) of the Technical University Zvolen, Forest District Kováčová, in variable forest and terrain conditions. Location of the points was measured by an exact terrestrial geodetic method and consequently by all receivers. To evaluate the location precision of each receiver we used the method of calculation of individual differences in co-ordinate values for each measurement, and calculation of average differences and their standard devia- tions for groups of measurements. The values of average co-ordinate errors and testing of the presence of systematic error were also calculated. To evaluate the influence of receiver type, stand age, tree species composition and terrain configuration multi-factor analysis of variance was used. General location error was 7.16 m for Topcon, 5.89 m for Magellan and 5.60 m for March. Difference between Topcon and the other two receivers is statistically significant. The influence of forest stand age is also statistically significant. The results of the test of tree species composition and terrain configuration influence are not unambiguous.

Suggested Citation

  • J. Tuček & J. Ligoš, 2002. "Forest canopy influence on the precision of location with GPS receivers," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 48(9), pages 399-407.
    • Handle: RePEc:caa:jnljfs:v:48:y:2002:i:9:id:11900-jfs
    DOI: 10.17221/11900-JFS
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    Citations

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    Cited by:

    1. M. Klimánek, 2010. "Analysis of the accuracy of GPS Trimble JUNO ST measurement in the conditions of forest canopy," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 56(2), pages 84-91.
    2. Vlastimil MURGAŠ & Ivan SAČKOV & Maroš SEDLIAK & Daniel TUNÁK & František CHUDÝ, 2018. "Assessing horizontal accuracy of inventory plots in forests with different mix of tree species composition and development stage," Journal of Forest Science, Czech Academy of Agricultural Sciences, vol. 64(11), pages 478-485.

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