基于高光谱数据的滴灌甜菜叶片全氮含量估算

李宗飞,苏继霞,费聪,李阳阳,刘宁宁,戴宇祥,张开祥,王开勇,樊华,陈兵

Estimation of total nitrogen content in sugarbeet leaves under drip irrigation based on hyperspectral characteristic parameters and vegetation index

Zong-Fei LI,Ji-Xia SU,Cong FEI,Yang-Yang LI,Ning-Ning LIU,Yu-Xiang DAI,Kai-Xiang ZHANG,Kai-Yong WANG,Hua FAN,Bing CHEN

表1 高光谱特征参数及植被指数定义

Table 1 Hyperspectral parameters and their definitions

光谱特征参数与植被指数 Spectral characteristic parameter and Spectral index 定义 Definition 红边斜率 Red edge slope (Dr) 680-760 nm内最大一阶微分光谱值 Maximum first order differential spectrum in 680-760 nm 红边位置 Red edge position (λr) 680-760 nm内最大的一阶微分光谱值对应的波长 The wavelength corresponding to the largest first-order differential spectrum in 680-760 nm 红边面积 Red edge area (SDr) 680-760 nm内一阶微分光谱值的总和 The sum of the first-order differential spectral values in 680-760 nm 黄边斜率 Yellow edge slope (Dy) 560-640 nm内最大一阶微分光谱值 Maximum first order differential spectrum in 560-640 nm 黄边位置 Yellow edge position (Λy) 560-640 nm内最大一阶微分光谱值对应的波长 The wavelength corresponding to the largest first-order differential spectrum in 560-640 nm 黄边面积 Yellow edge area (SDy) 560-640 nm内一阶微分光谱值的总和 The sum of the first-order differential spectral values in 560-640 nm 蓝边斜率 Blue edge slope (Db) 490-530 nm内最大一阶微分光谱值 Maximum first order differential spectrum in 490-530 nm 蓝边位置 Blue edge position (λb) 490-530 nm内最大一阶微分光谱值对应的波长 The wavelength corresponding to the largest first-order differential spectrum in 490-530 nm 蓝边面积 Blue edge area (SDb) 490-530 nm内一阶微分光谱值的总和 The sum of the first-order differential spectral values in 490-530 nm 比值植被指数 Ratio vegetation index (RVI) Rλ1/Rλ2 差值植被指数 Difference vegetation index (DVI) Rλ1- Rλ2 归一化比值植被指数 Normalized ratio vegetation index (NDVI) (RNIR-Rred)/(RNIR+Rred) 红边归一化差异指数 Red edge normalized difference index (NDI) (DRλ1-DRλ2)/(DRλ1+DRλ2)