Yusuke Oyama
Study of the effects of viewing angle in rice growth measurement using Terrestrial laser scanner
Atushi Rikimaru,Kazuyoshi Takahashi
Possibility of planar growth diagnostic methods have been suggested by measured laser scan from above rice and understand the characteristics of the three-dimensional shape in a rice strain(Izumi, 2010). However, in order to measure laser scanner from just above the rice, the frame for observation must be installed in a corner of the field. In existing studies propose a method for performing measurements of the entire field by measuring the field at an angle.
However, it is possible to affect the observations by observation angle to the target fields vary depending on the installation position of the Terrestrial laser scanner.
The purpose of this paper is that the focus on this point, consider the effect of viewing laser angle on the acquired data in the field measurement by Terrestrial,laser scanner.
We measured the field by Terrestrial laser scanner in the period from early July to late August is the rice growing season.And we examined the effect of a change in the viewing laser angle give by measuring instrument made by a double height, comparing the acquired data.
When analyzing the effect of viewing laser angle, we have examined the effects of viewing laser angle for each growth stage of rice to analyzed the characteristics of rice height get another point group by It is calculated that the number of point cloud is divided into a plurality of layers separately rice height, present in each layer.
I am following this conclusion.
¡ When the rice is in a state of growth is small, the impact of the observation angle is small.
¢ When the growth of the rice plant state is large, the effect of viewing laser angle is greater in the rice at the bottom of the short range, after heading, the effect of viewing angle becomes smaller.
£ Considered if the observation angle is changed by more than 3 ¡ë, and increases the effect of observation angle.
¤ Considered if the observation angle is increased, and the increase is correlated with changes in the time series of the growth of rice in relation to age and distance measuring laser from transplanting date.
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