基于特征优选和时空融合算法的黄河三角洲湿地类别制图方法研究

冯倩, 张佳华, 邓帆, 吴贞江, 赵恩灵, 郑培鑫, 韩杨

A mapping methodology for wetland categories of the Yellow River Delta based on optimal feature selection and spatio-temporal fusion algorithm

FENG Qian, ZHANG Jiahua, DENG Fan, WU Zhenjiang, ZHAO Enling, ZHENG Peixin, HAN Yang

表5 Landsat8特征集描述

Tab.5 Description of the feature set from Landsat8

特征类别	特征名称	特征描述/公式
光谱特征	波段(band)	蓝,绿,红,近红,中红1,中红2
植被/水体指数	归一化植被指数(normalized difference vegetation index,NDVI)	$\frac{R_{n i r} - R_{r e d}}{R_{n i r} + R_{r e d}}$
	比值植被指数(ratio vegetation index,RVI)	$\frac{R_{n i r}}{R_{r e d}}$
	差值植被指数(differential vegetation index,DVI)	$R_{n i r} - R_{r e d}$
	归一化水体指数(normalized difference water index,NDWI)	$\frac{R_{g r e e n} - R_{n i r}}{R_{g r e e n} + R_{n i r}}$
盐分/土壤指数	盐分指数 2(salinity index 2,SI2)	$\sqrt[]{{R_{g r e e n}}^{2} + {R_{r e d}}^{2} + {R_{n i r}}^{2}}$
	盐分指数 3(salinity index 3,SI3)	$\sqrt[]{{R_{g r e e n}}^{2} + {R_{r e d}}^{2}}$
	盐分指数(salinity index,SI-T)	( $\frac{R_{r e d}}{R_{n i r}}) \times 100$
	优化型土壤调节植被指数(soil adjusted vegetation index,SAVI)	$\frac{R_{n i r} - R_{r e d}}{R_{n i r} + R_{r e d} + 0.6}$
	土壤亮度指数(soil brightness index,SBI)	$\sqrt[]{{R_{r e d}}^{2} + {R_{n i r}}^{2}}$
K-T变换	亮度(brightness)	$\begin{array}{l} 0.3029 R_{b l u e} + 0.2786 R_{g r e e n} + 0.4733 R_{r e d} + 0.5599 R_{n i r} + \\ 0.5080 R_{s w i r l} + 0.1872 R_{s w i r 2} \end{array}$
	绿度(greenness)	$- 0.2941 R_{b l u e} - 0.2430 R_{g r e e n} + 0.5424 R_{r e d} + 0.7276 R_{n i r} - 0.7170 R_{s w i r l} - 0.1680 R_{s w i r 2}$
	湿度(wetness)	$\begin{array}{l} 0.1511 R_{b l u e} + 0.1973 R_{g r e e n} + 0.3283 R_{r e d} + 0.3407 R_{n i r} - \\ 0.7117 R_{s w i r l} - 0.4559 R_{s w i r 2} \end{array}$
纹理特征	方差 (GLGM_Variance)	$\sum_{i} \sum_{j} p (i, j) \times {(i - M e a n)}^{2}$
	对比度(GLGM_Contrast)	$\sum_{i} \sum_{j} p (i, j) \times {(i - j)}^{2}$
	熵(GLGM_Entropy)	$\sum_{i} \sum_{j} p (i, j) \times l n p (i, j)$
	相关性(GLGM_Correlation)	$\sum_{i} \sum_{j} \frac{(i - M e a n) \times (j - M e a n) p {(i, j)}^{2}}{V a r i a n c e}$
	二阶矩(GLGM_Second Moment)	$\sum_{i} \sum_{j} p {(i, j)}^{2}$