基于面向对象的多源卫星遥感影像玉米倒伏面积提取

朱厚文,罗冲,官海翔,张新乐,杨嘉鑫,宋梦宁,刘焕军

Object-oriented Extraction of Maize Fallen Area based on Multi-source Satellite Remote Sensing Images

Houwen Zhu,Chong Luo,Haixiang Guan,Xinle Zhang,Jiaxin Yang,Mengning Song,Huanjun Liu

表2 本文所用4种植被指数的计算公式

Table 2 Calculation formula of four vegetation indices used in this study

植被指数	简写	计算公式
归一化植被指数	NDVI	$N D V I = \frac{N I R - R E D}{N I R + R E D}$
过量绿指数	ExG	$r = \frac{R}{(R + B + G)}$ $b = \frac{B}{(R + B + G)}$ $g = \frac{G}{(R + B + G)}$ $E x G = 2 \times g - r - b$
绿色归一化植被指数	GNDVI	$G N D V I = ??? \frac{N I R - G R E E N}{N I R + G R E E N}$
土壤调节植被指数	SAVI	$S A V I = (\frac{N I R - R E D}{N I R + R E D + L}) (1 + L)$