| Project/Area Number |
09660278
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物環境
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| Research Institution | University of Tsukuba |
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Principal Investigator |
YOSHINO Kunihiko TSUKUBA UNIVERSITY, INSTITUTE OF POLICY AND PLANNING SCIENCES, ASSISTANT PROFESSOR, 社会工学系, 講師 (60182804)
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| Co-Investigator(Kenkyū-buntansha) |
HORIKAWA Naoki NATIONAL CENTER FOR INTERNATIONAL AGRICULTURE, 生産利用部, 主任研究員
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 1999: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1998: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1997: ¥2,300,000 (Direct Cost: ¥2,300,000)
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| Keywords | Remote Sensing / Multiangular Spectral Reflectance / Rice Canopy / Rice Variety / Rice Crop Productivity / 方向性反射特性 / ステレオ写真 / 解析写真測量 / 品種判別 / 反収量推定 / 水稲 / BDRF / LAI |
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| Research Abstract |
In this study, we statistically discussed the possibility to classify rice varieties using the ground data of multiangular spectral reflectance data out of rice plant canopy. We grew fourteen varieties of rice in the experimental rice paddy field where environmental conditions like soil, nutrition, water supply and local climate were expected to be homogeneous, and then we measured the value of the spectral reflectance at multiangulars of each rice canopy. Reflectance data were collected from 400nm to 850nm in every 1nm. And we measured the spectral reflectance at the off nadir angle of 45 degrees, 30 degrees, 15 degrees in the direction of the backward scattering and the forward scattering in the principal plane, and at the same angle of the principal plane in the orthogonal plane.
The reflectance data of the green band (550nm - 560nm), the visible red band (675nm - 685nm) and the near infrared band (745nm - 749nm) at every measuring angle were computed for each rice variety. And then, the unpaired t-tests were done between one pair of means of rice varieties at every measuring angle.
As a result of this test, the number of pairs of rice varieties which can be statistically distinguished using multiangular spectral reflectance data increased more than that just using the spectral reflectance data at the nadir angle. It became clearer that the difference of spectral reflectance measured from the rice canopies at multiangulars is statistically significant.
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