Effects of forest thinning on static horizontal positions collected with a mapping-grade GNSS receiver

Ramazan Akbulut, Zennure Ucar, Pete Bettinger, Krista Merry, Shingo Obata


The static horizontal position accuracy of a mapping-grade GPS receiver was tested in two different pine forest conditions (pre-thinning and post-thinning). The main objective of this study was to describe the horizontal position error that might be observed shortly before and shortly after the thinning operation. In general, by using the Trimble Juno T41 series receiver, we found the static horizontal position error prior to the thinning operation averaged 4.14 m when each individual point was assumed to be as a sample. If the northing and easting values of each epoch were averaged, the error would be 1.57 m. According to the most immediate post-thinning measurements, the horizontal position error averaged 2.32 m for individual samples, and 1.02 m when the northing and easting values were averaged. Subsequent post-thinning measurements showed further improvements in static horizontal position accuracy. The findings suggested that the magnitude of horizontal position error decreased after the thinning operation. Therefore, the quality of the data and the density of the trees around the data collection area are dependent.


Global navigation satellite systems; global positioning systems; static horizontal accuracy

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Agnew, D.C., and K.M. Larson. 2007. Finding the repeat times of the GPS constellation. GPS Solutions. 11(1): 71-76.

Bastos, A.A., and H. Hasegawa. 2013. Behavior of GPS signal interruption probability under tree canopies in different forest conditions. European Journal of Remote Sensing. 46(1): 613-622.

Bettinger, P., and S. Fei. 2010. One year's experience with a recreation-grade GPS receiver. Mathematical and Computational Forestry & Natural-Resource Sciences. 2(2): 153-160.

Bettinger, P., and K.L. Merry. 2012. Influence of the juxtaposition of trees on consumer-grade GPS position quality. Mathematical and Computational Forestry & Natural-Resource Sciences. 4(2): 81-91.

Brach, M., and M. Zasada. 2014. The effect of mounting height on GNSS receiver positioning accuracy in forested conditions. Croatian Journal of Forest Engineering. 35(2): 245-253.

Danskin, S., P. Bettinger, and T. Jordan. 2009a. Multipath mitigation under forest canopies: A choke ring antenna solution. Forest Science. 55(2): 109-116.

Danskin, S.D., P. Bettinger, T.R. Jordan, and C. Cieszewski. 2009b. A comparison of GPS performance in a southern hardwood forest: Exploring low-cost solutions for forestry applications. Southern Journal of Applied Forestry. 33(1): 9-16.

Dong, D., M. Wang, W. Chen, Z. Zeng, L. Song, Q. Zhang, M. Cai, Y. Chang, and J. Lv. 2016. Mitigation of multipath effect in GNSS short baseline positioning by the multipath hemispherical map. Journal of Geodesy. 90(3): 255-262.

Edson, C., and M.G. Wing. 2012. Tree location measurement accuracy with a mapping-grade GPS receiver under forest canopy. Forest Science. 58(6): 567-576.

Fokker, A.D. 1957. Geodetic annual variation of the sidereal day. Physica. 23(6-10): 1100-1102.

Frank, J., and M.G. Wing. 2014. Balancing horizontal accuracy and data collection efficiency with mapping-grade receivers. Forestry. 87(3): 389-397.

Frostman, T.O., D.W. Martin, and W. Schwerdtfeger. 1967. Annual and semiannual variations in the length of day, related to geophysical events. Journal of Geophysical Research. 72(20): 5065-5073.

Kaartinen, H., J. Hyyppä, M. Vastaranta, A. Kukko, A. Jaakkola, X. Yu, J. Pyörälä, X. Liang, J. Liu, Y. Wang, R. Kaijaluoto, T. Melkas, M. Holopainen, and H. Hyyppä. 2015. Accuracy of kinematic positioning using global satellite navigation systems under forest canopies. Forests. 6(9): 3218-3236.

Leick, A., L. Rapoport, and D. Tatarnikov. 2015. GPS satellite surveying. John Wiley & Sons, Inc., Hoboken, NJ. 807 p.

Ordoñez, C., J. Martínez, J.F. de Cos Juez, and F. Sánchez Lasheras. 2012. Comparison of GPS observations made in a forestry setting using functional data analysis. International Journal of Computer Mathematics. 89(3): 402-408.

Pirti, A. 2016. The seasonal effects of deciduous tree foliage on CORS-GNSS measurements (VRS/FKP). Technički Vjesnik (23(3): 769-774.

Ragheb, A.E., P.J. Clarke, and S.J. Edwards. 2007. GPS sidereal filtering: coordinate- and carrier-phase-level strategies. Journal of Geodesy. 81(5): 325-335.

Ransom, M.D., J. Rhynold, and P. Bettinger. 2010. Performance of mapping-grade GPS receivers in southeastern forest conditions. RURALS: Review of Undergraduate Research in Agricultural and Life Sciences. 5(1): Article 2.

Simwanda, M., M.G. Wing, and J. Sessions. 2011. Evaluating global positioning system accuracy for forest biomass transportation tracking within varying forest canopy. Western Journal of Applied Forestry. 26(4): 165-173.

Trimble Navigation Limited. 2014. Solo Forest version 4.1.2 user's guide. Trimble Navigation Limited, Corvallis, OR. 114 p.

Trimble Navigation Limited. 2016. Trimble Juno T41 rugged handheld computer. Trimble Navigation Limited, Corvallis, OR. 2 p.

Ucar, Z., P. Bettinger, S. Weaver, K.L. Merry, and K. Faw. 2014. Dynamic accuracy of recreation-grade GPS receivers in oak-hickory forests. Forestry. 87: 504-511.

Unger, D.R., I-K. Hung, Y. Zhang, J. Parker, D.L. Kulhavy, and D.W. Coble. 2013. Accuracy assessment of perimeter and area calculations using consumer-grade global positioning system (GPS) units in southern forests. Southern Journal of Applied Forestry. 37(4): 208-215.

Weaver, S.A., Z. Ucar, P. Bettinger, and K. Merry. 2015. How a GNSS receiver is held may affect static horizontal position accuracy. PLoS ONE. 10(4): e0124696. doi:10.1371/journal.pone.0124696.

Wing, M.G., and J. Frank. 2011. An examination of five identical mapping-grade global positioning system receivers in two forest settings. Western Journal of Applied Forestry. 26(3): 19-125.


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