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基于Hyperion高光譜影像的冬小麥地上干生物量反演
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國家自然科學基金項目(41471364,、41371396)和國家高技術(shù)研究發(fā)展計劃(863計劃)項目(2012AA12A307)


Retrieving Winter Wheat Above-ground Dry Biomass Based on Hyperion Hyperspectral Imagery
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    摘要:

    在黃淮海糧食主產(chǎn)區(qū)選擇河北省衡水市深州市為試驗區(qū),,以冬小麥地上干生物量為研究對象,,以作物冠層高光譜和EO-1 Hyperion高光譜衛(wèi)星數(shù)據(jù)為主要數(shù)據(jù)源,在分析冠層高光譜構(gòu)建的窄波段植被指數(shù)(N-VIs)與實測冬小麥地上干生物量間相關(guān)性基礎上,,提出了利用擬合精度R2極大值區(qū)域重心確定冬小麥干生物量敏感的光譜波段中心的方法,,并運用該方法確定了冬小麥生物量敏感波段中心,。在此基礎上,,以敏感波段中心篩選結(jié)果為指導,利用窄波段植被指數(shù)及相關(guān)波段開展Hyperion高光譜衛(wèi)星遙感區(qū)域冬小麥干生物量遙感反演和精度驗證,。最終,,按精度最高原則優(yōu)選區(qū)域冬小麥地上生物量反演結(jié)果。其中,,研究采用了冬小麥孕穗期Hyperion數(shù)據(jù),,涉及的植被指數(shù)包括窄波段歸一化植被指數(shù)(N-NDVI)、窄波段差值植被指數(shù)(N-DVI)和窄波段比值植被指數(shù)(N-RVI),。結(jié)果表明,,通過與實測冬小麥地上干生物量對比,利用冠層高光譜冬小麥地上干生物量反演敏感波段篩選結(jié)果及其相應波段構(gòu)建的Hyperion窄波段植被指數(shù)進行孕穗期作物干生物量估算取得了較好結(jié)果,,其精度由大到小為:N-NDVI,、N-RVI、N-DVI,。其中,,以波段B18(波長528.57nm)、波段B82(波長962.91nm)構(gòu)建的Hyperion N-NDVI估算區(qū)域冬小麥地上干生物量精度最高,相對誤差(RE)和歸一化均方根誤差(NRMSE)分別為12.65%和13.78%,。

    Abstract:

    How to efficiently use hyperspectral remote sensing data to quantitatively retrieve bio-physical and bio-chemical crop parameters and accurately obtain regional crop growth information has always been one of the hot issues in agricultural quantitative remote sensing researches. Based on optimal selection of sensitive hyperspectral bands, the research on retrieval of winter wheat above-ground dry biomass (ADBM) from Hyperion hyperspectral imagery was carried out in Shenzhou County, Hebei Province of Huang-Huai-Hai Plain which was the major grain producing region in China. Firstly, through analyzing relationship and their coefficient of determination (R2) values between field-measured ADBM of winter wheat and narrow band vegetation index (N-VIs) from crop canopy hyperspectral data, the method of determining hyperspectral sensitive band centers based on areas weight of R2 maximum values was proposed and applied. Then, supported by results of hyperspectral sensitive band centers, Hyperion hyperspectral remote sensing data was used to retrieve winter wheat ADBM at regional scale by using the N-VIs, and the accuracy of winter wheat biomass estimation results was validated. The Hyperion remote sensing data was acquired on Apr. 23, 2014, which was at the booting stage of winter wheat, and the used N-VIs included narrow band normalized difference vegetation index (N-NDVI), narrow band difference vegetation index (N-DVI) and narrow band ratio vegetation index (N-RVI). Compared with field-measured winter wheat ADBM, based on optimal selection of sensitive hyperspectral bands and Hyperion N-VIs constructed by the selected sensitive bands, the method of using Hyperion N-VIs to retrieve winter wheat ADBM had better performance, and the accuracy order of winter wheat ADBM of the N-VIs were determined, showing a descending trend as follows: N-NDVI, N-RVI and N-DVI. Among them, based on the Hyperion N-NDVI constructed by the selected sensitive bands (528.57nm and 962.91nm), the retrieval result of ADBM of winter wheat was the best and the relative error (RE) and normalized root mean square error (NRMSE) were 12.65% and 13.78%, respectively. It was proved that based on optimal selection of sensitive hyperspectral bands, using Hyperion N-VIs to retrieve winter wheat ADBM had certain feasibility and effectiveness. It could provide a new thought thread for hyperspectral remote sensing sensitive bands selection and for the improvement of quantitatively retrieving bio-physical and bio-chemical crop parameters.

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任建強,吳尚蓉,劉斌,陳仲新,劉杏認,李賀.基于Hyperion高光譜影像的冬小麥地上干生物量反演[J].農(nóng)業(yè)機械學報,2018,49(4):199-211. REN Jianqiang, WU Shangrong, LIU Bin, CHEN Zhongxin, LIU Xingren, LI He. Retrieving Winter Wheat Above-ground Dry Biomass Based on Hyperion Hyperspectral Imagery[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(4):199-211.

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  • 收稿日期:2017-12-20
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  • 在線發(fā)布日期: 2018-04-10
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