应用生态学报2018，Vol.29Issue(4)：1225-1232,8.DOI:10.13287/j.1001-9332.201804.020
基于无人机高清数码影像和高光谱遥感数据反演大豆典型生育期氮平衡指数
The inversion of nitrogen balance index in typical growth period of soybean based on high definition digital image and hyperspectral data on unmanned aerial vehicles
摘要
Abstract
Nitrogen balance index (NBI) is one of the important indicators for crop growth.The high and low status of nitrogen can be quickly monitored by measuring NBI,which can provide accurate information of agricultural production and management.The relationship between NBI and original spectrum and derivative spectrum of infrared and near infrared wavelength from flowering to maturity stage was analyzed based on high definition digital image and hyperspectral data on unmanned aerial vehicles.Then,the sensitive bands were selected and the vegetation indexes were calculated.The inversion models of NBI were constructed by empirical model method.The optimal inversion model was obtained by analysing the determination coefficient (R2) and the root mean square error (RMSE) of validating model.The results showed that the correlation between NBI and derivative spectral reflectance was more stronger than that between it and original spectral reflectance.All the 14 vegetation indices selected in this study,except the derivative spectral photochemical reflectance index,had significant correlation with NBI.The NBI inversion models were constructed based on those 13 vegetation indices and the accuracy was analyzed.The inversion model constructed by derivative spectral difference vegetation index had the highest accuracy,with the R2 and RMSE being 0.771 and 3.077 respectively.The soybean NBI distribution maps of the whole growing stages generated by this model could reflect the soybean growth state.Estimation of NBI using the high definition digital image and hyperspectral data obtained by unmanned aerial vehicle,as shown by our results,could be a real-time,dynamic,non-destructive and effective way to monitor the nitrogen status of soybean.It's a simple and practical method for precise management of nitrogen in soybean.关键词
无人机/高清数码影像/高光谱遥感数据/氮平衡指数/植被指数/导数光谱/大豆Key words
unmanned aerial vehicle/high definition digital image/hyperspectral data/nitrogen balance index/vegetation index/derivative spectrum/soybean引用本文复制引用
李长春,陈鹏,陆国政,马春艳,马潇潇,王双亭..基于无人机高清数码影像和高光谱遥感数据反演大豆典型生育期氮平衡指数[J].应用生态学报,2018,29(4):1225-1232,8.基金项目
本文由国家高技术研究发展计划项目(2013AA102303)和河南省智慧中原地理信息技术协同创新中心开放课题项目(2016A002)资助 （2013AA102303）
This work was supported by the National Technology Research and Development Program of China (2013AA102303) and the Open Project of Henan Provincial Central Plains Geographic Information Technology Cooperative Innovation Center (2016A002). （2013AA102303）
