研究者総覧
論文
- タイトル
- タイトル（英）
- Integrate Growing Temperature to Estimate the Nitrogen Content of Rice Plants at the Heading Stage Using Hyperspectral Imagery
- 参照URL
- https://researchmap.jp/7000020455/published_papers/40343615
- 著者
- 著者（英）
- Hiroyuki Onoyama,Chanseok Ryu,Masahiko Suguri,Michihisa Iida
- 担当区分
- 筆頭著者
- 概要
- 概要（英）
- Ground-based hyperspectral imaging was used for estimating the nitrogen content of rice plants at the heading stage. The images were separated into two parts: 1) the rice plant; and 2) other elements using the equation of "GreenNDVI-NDVI." was calculated as the ratio of the reflectance of the rice plant to that of a reference board. Partial least square (PLS) model using reflectance data (R-PLS model) and PLS model using reflectance and temperature data (RT-PLS) was constructed to compare the accuracy between them. RT-PLS model was developed to improve the accuracy of R-PLS model by considering the differences of weather condition among years. When the precision (R-2) and accuracy [root-mean-square error (RMSE) and relative error (RE)] of each R-PLS model were evaluated for each year using twofold cross-validation, R-2 ranged from 0.42 to 0.81, RMSE ranged from 0.81 to 1.13 gm(-2), and RE ranged from 10.1% to 11.8%. When R-PLS model of each year was used to predict the other years' data to determine the predictive power, RMSE values were higher (ranging from 1.40 to 5.82 gm(-2)) than those in each year's validation value due to over- or underestimation. When an R-PLS model based on the data of 2 years was fitted, RMSE ranged from 1.11 to 4.15 gm(-2) and RE ranged from 13.7% to 42.8%. By contrast, in RT-PLS models, RMSE and RE fell to less than 1.21 gm(-2) and 12.3%, respectively. Thus, a combination of reflectance and temperature data was useful for constructing a model of rice plant at the heading stage.
- 出版者・発行元
- 出版者・発行元（英）
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- 誌名
- 誌名（英）
- IEEE JOURNAL OF SELECTED TOPICS IN APPLIED EARTH OBSERVATIONS AND REMOTE SENSING
- 巻
- 7
- 号
- 6
- 開始ページ
- 2506
- 終了ページ
- 2515
- 出版年月
- 2014年6月
- 査読の有無
- 査読有り
- 招待の有無
- 掲載種別
- 研究論文（学術雑誌）
- ISSN
- 1939-1404
- DOI URL
- https://doi.org/10.1109/JSTARS.2014.2329474
- 共同研究・競争的資金等の研究課題
研究者
小野山 博之
(オノヤマ ヒロユキ)