Takashi MARUYAMA
An Examination of the Growth Monitoring of Rice Plants Using Laser Scanner Measurements from Above
Kazuyoshi TAKAHASHI
Atsushi RIKIMARU
For rice growth monitoring over a wide area using low altitude laser scanner measurements by a micro UAV, laser-scan data of rice plants in 5 test fields were acquired by examining how the following parameters would affect an acquired data: the inclination angle of the laser scanning plane, the planting density of the rice and the scanning path direction (i.e. parallel to planting direction or perpendicular to planting direction). The laser scan data of the rice plants in the paddy field were acquired using a laser scanner above the rice plants within a vertical scanning plane and an oblique scanning plane.
In this study, we investigated whether differences occur in the measurement data by the cultivation conditions and measurement conditions. As a method, we investigated the vertical distribution of the laser scanner measurement data.
As a result, ĦShowed a high correlation between plant height and 99percentile laser measurements(R2=0.97 over). ˘It was found that an oblique measurement has more capability than a vertical measurement to acquire information about the rice plants. In particular, this trend has appeared the lower layer. £In the 50 to 95-percentile heights, the height differences of laser-scan data between parallel and perpendicular scanning were about 0.13 m and 0.17 m for the vertical and oblique measurements respectively.
Thus, it was found that when grasping the rice plants growth in broad by the laser scanner measurements from rice plants above, it is necessary to consider the influence of the planting direction of the laser scanner measurement data acquired in the field a dense planting particularly
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