30 November 2016 Method for estimating rice plant height without ground surface detection using laser scanner measurement
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Abstract
A method for estimating the height of rice plants, using three-dimensional laser range data from point clouds, is proposed and assessed. Rice plant height (H) is estimated using a reference position at the top of the rice plant, avoiding the need to determine the ground position. Field experiments were performed with a SICK LMS 200 laser scanner in 2013 and 2014 on a test field with five different planting geometries. Percentile analysis identified the closest percentile to the top of the rice plant (pt=1), with vertical distances at the first percentile unaffected by planting geometry. The plant bottom position was identified using three different percentile ranks (pb=95, pb  =80, and pb  =70). Relative vertical distances (rD) were computed from the difference between the top and bottom positions of the rice plant. These correlated well with measured H, with slopes greater than 1.0. A greater number of stems in 2014 led to steeper slopes. Estimated H was more accurate when plant bottom positions were closer to the ground surface, and the best results were obtained with pb=95 (r2>0.87; RMSE≈4  cm). Overall, H was typically 16.0 cm greater than  rD with pb=95.
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Anh Thu Thi Phan, Anh Thu Thi Phan, Kazuyoshi Takahashi, Kazuyoshi Takahashi, Atsushi Rikimaru, Atsushi Rikimaru, Yasuhiro Higuchi, Yasuhiro Higuchi, } "Method for estimating rice plant height without ground surface detection using laser scanner measurement," Journal of Applied Remote Sensing 10(4), 046018 (30 November 2016). https://doi.org/10.1117/1.JRS.10.046018 . Submission:
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