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Journal of Applied Remote Sensing • Open Access

Method for estimating rice plant height without ground surface detection using laser scanner measurement
Author(s): Anh Thu Thi Phan; Kazuyoshi Takahashi; Atsushi Rikimaru; Yasuhiro Higuchi

Paper 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.

Paper Details

Date Published: 30 November 2016
PDF: 11 pages
J. Appl. Rem. Sens. 10(4) 046018 doi: 10.1117/1.JRS.10.046018
Published in: Journal of Applied Remote Sensing Volume 10, Issue 4
Show Author Affiliations
Anh Thu Thi Phan, Nagaoka Univ. of Technology (Japan)
Kazuyoshi Takahashi, Nagaoka Univ. of Technology (Japan)
Atsushi Rikimaru, Nagaoka Univ. of Technology (Japan)
Yasuhiro Higuchi, Niigata Agricultural Research Institute (Japan)

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