昆明冬季典型作物的高光谱特征对比研究

Comparative analysis of hyperspectral characteristics of winter typical crops in Kunming

为开展昆明市冬季典型作物高光谱特征对比研究,借助SOC 710vp便携式光谱仪,获取白萝卜和云南大苦菜的高光谱数据,对比原始、一阶微分及连续统去除光谱,并构建光谱特征参数。结果表明:(1)两种作物的原始光谱曲线走势相似但白萝卜的反射率较高;(2)500~760 nm两种作物的一阶微分值差异较为显著,红边位置、光谱幅值和面积特征参数区分效果较好;(3)经连续统去除后,可见光范围内作物间可分性增强,划分波段范围并结合吸收特征参数,可有效辨别。可见,利用光谱曲线和特征参数区分作物是可行的,将为云贵高原地区作物精细识别和高原特色现代农业建设提供理论依据。

The visible/infrared imaging portable spectrometer(SOC 710 vp,USA)was used to obtain the hyperspectral data of turnip and Yunnan sowthistle.A comparative study on hyperspectral characteristics of winter typical crops in Kunming was carried out fby comparing the original spectral,the first derivative spectral and the continuum removal spectral and constructing characteristic parameters.The result indicated that the original spectral curves of two crops were similar in shape,but the reflectance of turnip was higher.The first derivative value of two crops had a great gap in the 500~760 nm,and two crops could be quickly distinguished according to red edge position,red/blue/yellow edge slope and red/blue/yellow edge area.The spectral separability between two crops was enhanced in visible bands by continuum removal method.The crops could be distinguished and identified by dividing the band range and combining the absorption characteristic parameters.Therefore,it was feasible to use spectral curve and characteristic parameters to distinguish crop species.The results of this study would provide theoretical basis for the detailed identification of crops and the construction of modern agriculture with plateau characteristics.