基于Landsat8数据的近海养殖区自动提取方法研究

基于Landsat8数据的近海养殖区自动提取方法研究

武易天, 陈甫, 马勇, 刘建波, 李信鹏

Research on automatic extraction method for coastal aquaculture area using Landsat8 data

Yitian WU, Fu CHEN, Yong MA, Jianbo LIU, Xinpeng LI

表1 波段扩展中所包含的特征指数

Tab.1 Feature indexes included in band expansion

特征信息	特征指数			数学表达式
光谱特征	MNDWI			$MNDWI = (ban d_{3} - ban d_{6}) / (ban d_{3} + ban d_{6})$
	AWEInsh(归一化)			$AWEInsh = \frac{4 (ban d_{3} - ban d_{6}) - (0.25 ban d_{5} + 2.75 ban d_{7})}{ban d_{3} + ban d_{5} + ban d_{6} + ban d_{7}}$
	AWEIsh(归一化)			$AWEIsh = \frac{ban d_{2} + 2.5 ban d_{3} - 1.5 (ban d_{5} + ban d_{6}) - 0.25 ban d_{7}}{ban d_{2} + ban d_{3} + ban d_{5} + ban d_{6} + ban d_{7}}$
	CHL			$CHL = 8.48 ban d_{4} / ban d_{1}$
	TSM			$TSM = 0.028 ban d_{2} + 0.019 ban d_{3} - 5.31 ban d_{3} / ban d_{2} + 0.537$
特征信息		特征指数	数学表达式
相关性特征		SAD	$SAD = co s^{- 1} (\frac{x^{T} y}{‖ x ‖ ‖ y ‖})$
		corr	$corr = \frac{{(x - \bar{x})}^{T} (y - \bar{y})}{‖ x - \bar{x} ‖ ‖ y - \bar{y} ‖}$
		s	$s = ‖ x - y ‖$
		SID	$SID = D (x ‖ y) + D (y ‖ x)$		$\{\begin{array}{l} D (x ‖ y) = \sum_{l}^{=} p_{l} \ln (p_{l} / q_{l}) \\ D (y ‖ x) = \sum_{l}^{=} q_{l} \ln (q_{l} / p_{l}) \end{array}$ $\{\begin{array}{l} p_{l} = x_{l} / \sum_{j}^{=} x_{j} \\ q_{l} = y_{l} / \sum_{j}^{=} y_{j} \end{array}$