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基于無人機高光譜影像的冬小麥全蝕病監(jiān)測模型研究
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國家自然科學基金項目(41501481),、河南省科技攻關項目(172102110055,、172102110054)、河南省自然科學基金項目(182300410084)和河南農(nóng)業(yè)大學科技創(chuàng)新基金項目(KJCX2015A12)


Monitoring Model of Winter Wheat Take-all Based on UAV Hyperspectral Imaging
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    摘要:

    冬小麥全蝕病是導致小麥大幅減產(chǎn)甚至絕收的土傳檢疫性病害,??焖佟o損地監(jiān)測冬小麥全蝕病空間分布對其防治具有重要意義,。以無人機搭載成像高光譜儀為遙感平臺,,利用成像高光譜影像結合地面病害調(diào)查數(shù)據(jù),在田塊尺度對冬小麥全蝕病病情指數(shù)分布進行空間填圖,。利用地物光譜儀(ASD)同步獲取的高光譜數(shù)據(jù)評價UHD185光譜數(shù)據(jù)質(zhì)量,,綜合運用統(tǒng)計分析以及遙感反演填圖技術,計算光譜指數(shù) (Difference spectral index, DSI),、比值光譜指數(shù) (Ratio spectral index, RSI) 及歸一化差值光譜指數(shù) (Normalized difference spectral index, NDSI) 與病情指數(shù)(DI)構建決定系數(shù)等勢圖,,篩選最優(yōu)光譜指數(shù)與DI構建線性回歸模型,并利用3個光譜指數(shù)構建偏最小二乘回歸預測模型,,以對比模型預測精度與穩(wěn)健性,。最后用獨立數(shù)據(jù)對模型進行檢驗。結果表明,,冬小麥冠層的ASD光譜數(shù)據(jù)與UHD185光譜數(shù)據(jù)相關性顯著,,決定系數(shù)R2達0.97以上,3類光譜指數(shù)與DI構建偏最小二乘回歸模型,,得到模型驗證結果R2=0.6292,RMSE=10.2%,MAE=16.6%),,其中DSI(R818,R534)對模型貢獻度最高,利用DSI(R818,R534)與DI構建線性回歸模型為y=-6.4901x+1.4613 (R2=0.8605, RMSE=7.3%, MAE=19.1%),,且通過獨立樣本的模型驗證精度(R2=0.76,,RMSE=14.9%,MAE=11.7%,,n=20),。最后使用該模型對冬小麥進行病情指數(shù)反演,制作了冬小麥全蝕病病害空間分布圖,,本研究結果為無人機高光譜遙感在冬小麥全蝕病的精準監(jiān)測方面提供了技術支撐,,并對未來衛(wèi)星遙感探索冬小麥全蝕病大面積監(jiān)測提供了理論基礎。

    Abstract:

    Winter wheat take-all is a quarantine disease that causes wheat to be significantly reduced or even rejected. Rapid and non-destructive monitoring of the spatial distribution of winter wheat take-all is of great significance for its prevention and control. The UAV-equipped imaging hyperspectral sensor was used as the remote sensing platform. The imaging hyperspectral image combined with the ground disease survey data was used to try to map the distribution of wheat take-all in the field scale. The quality of UHD185 spectral data was evaluated by synchronously acquired terrestrial ASD hyperspectral data. The statistical analysis and remote sensing inversion mapping techniques were used to calculate the differential spectral index (DSI) and ratio spectral index (RSI). Normalized difference spectral index (NDSI) and disease index (DI) were constructed to determine the coefficient equipotential map, and the optimal spectral index and DI were constructed to construct a linear regression model, and the partial least squares constructed with three indices were constructed. The accuracy and robustness of the prediction model constructed by regression method were compared. Finally, the model was tested with independent data. The results showed that the ASD spectral data of winter wheat canopy was significantly correlated with UHD185 spectral data, R2 was above 0.97, and the three spectral indices were compared with DI to construct a partial least squares regression model and the model verification results were obtained (R2=0.6292, RMSE is 10.2%, MAE is 16.6%). The results showed that DSI(R818,R534) had the highest contribution to the model with the formula for linear regression model of DSI (R818,R534) and DI as y=-6.4901x+1.4613 (R2=0.8605, RMSE is 7.3%, MAE is 19.1%), which was verified by independent samples for model accuracy (R2=0.76, RMSE is 14.9%, MAE is 11.7%, n=20). Finally, the model was used to invert the DI of the plot, and the spatial distribution map of winter wheat take-all was made. The research provided a technical basis for UAV hyperspectral remote sensing in the accurate monitoring and application of winter wheat take-all. It provided a theoretical basis for the future satellite remote sensing to explore large-scale monitoring of winter wheat take-all.

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郭偉,朱耀輝,王慧芳,張娟,董萍,喬紅波.基于無人機高光譜影像的冬小麥全蝕病監(jiān)測模型研究[J].農(nóng)業(yè)機械學報,2019,50(9):162-169. GUO Wei, ZHU Yaohui, WANG Huifang, ZHANG Juan, DONG Ping, QIAO Hongbo. Monitoring Model of Winter Wheat Take-all Based on UAV Hyperspectral Imaging[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(9):162-169.

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  • 收稿日期:2019-02-15
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  • 在線發(fā)布日期: 2019-09-10
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