基于高分光学与全极化SAR的海南八门湾红树林种间分类方法

doi:10.11978/2022096

Abstract

Abstract:

A Reasonable interspecific composition structure of mangrove is the premise of effectively bringing into play the ecological value of mangrove wetland, and clear information of interspecific distribution of mangrove is an effective basis for mangrove ecosystem management and planning. For the mangrove wetland in the Hainan Bamen bay, based on GF-3 fully polarimetric Synthetic Aperture Radar (SAR) and GF-6 multi-spectral remote sensing data, 35 mangrove remote sensing features were extracted, and the importance ranking, feature screening and inter-species classification of mangrove were carried out using eXtreme Gradient Bo3osting (XGBoost) algorithm. The accuracy of XGBoost was compared with the traditional Support Vector Machine (SVM) and Random Forest (RF) machine learning algorithms, and the classification accuracy of three feature combination methods (preferred feature, multispectral feature and full polarization SAR feature) is compared based on the XGBoost algorithm.The purpose is to explore the applicability of XGBoost to mangrove interspecific classification and the ability of optical and fully polarized SAR data for mangrove interspecific classification. The results showed that: 1) The dominant features of mangrove species identification were multi-spectral spectral bands, polarization decomposition parameters, spectral vegetation index, and only the first eight (G, B, Y_s, NIR, EVI, RVI, NDVI, F_s) were used to achieve high classification accuracy. 2) XGBoost has the highest overall classification accuracy of 86.16%, and Kappa has 0.836. The classification accuracy of this algorithm is 3% ~ 8% higher than SVM and RF. The accuracy of mangrove interspecific classification using multispectral and fully polarimetric SAR was 10% ~ 12% higher than that used multispectral or fully polarimetric SAR alone. 3) The total area of mangroves in the Bamen bay was 797.58 hm², and there were 9 dominant true mangrove species, Avicennia marina, Bruguiera sexangular, Rhizophora stylosa, Sonneratia alba, Rhizophoraceae, Bruguiera gymnorrhiza, Lumnitzera racemosa Willd, Rhizophora apiculate, and Excoecaria agallocha Linn. The area of Sonneratia alba and Lumnitzera racemosa Willd were larger, accounting for 45.46% and 21.21% of the total mangrove area, respectively. In this paper, the interspecific classification of mangroves in the Bamen bay, Hainan province was studied based on high-resolution optics and fully-polarimetric SAR, which can provide data support and technical support for the protection and management of mangrove ecosystem.

Key words: mangrove, interspecific classification, multispectral, fully polarimetric SAR, XGBoost

ZHANG Chengfei, REN Guangbo, WU Peiqiang, HU Yabin, MA Yi, YAN Yu, ZHANG Jingrui. Mangrove species classification in the Hainan Bamen Bay based on GF optics and fully polarimetric SAR[J].Journal of Tropical Oceanography, 2023, 42(2): 153-168.

Figures/Tables 13

Fig. 1

Tab. 1

Tab. 2

Mangrove types and interpretation of remote sensing images"

红树种类	现场照片	GF-6影像	GF-3影像	红树属性及影像特征
白骨壤(Avicennia marina)				小叶、耐盐、耐淹、常绿灌木或小乔木、常分布于淡水注入较少的海湾区域。影像纹理略粗糙, 色调较均一, GF-6影像为暗红色, GF-3影像为紫色
海莲(Bruguiera sexangula)				木榄属乔木或灌木, 生于滨海盐滩或潮水到达的沼泽地。影像纹理较平滑, 色调较均一, GF-6影像为亮红色, GF-3影像为白色
红海榄(Rhizophora stylosa Griff)				支柱根、常绿乔木或灌木、较耐盐、多分布于河口外侧盐度较高的红树林内滩。影像纹理粗糙, 色调略杂乱, GF-6影像为暗红色, GF-3影像为紫色
杯萼海桑(Sonneratia alba Sm)				海桑属灌木或乔木, 生于滨海泥滩和河流两侧而潮水到达的红树林群落中。影像纹理粗糙, 色调较均一, GF-6影像为暗红色中掺杂白色斑点, GF-3影像为灰绿色
角果木(Ceriops tagal)				灌木或乔木, 耐盐性较强, 生于潮涨时仅淹没树干基部的泥滩和海湾内的沼泽地。影像纹理平滑细腻, 色调均一, GF-6影像为暗红色, GF-3影像浅红色
木榄(Bruguiera gymnorrhiza)				常绿乔木或灌木, 耐淹能力较差、多分布于红树林内滩。影像纹理略粗糙, 色调较均一, GF-6影像为亮红色, GF-3影像为灰绿色
榄李(Lumnitzera racemosa Willd)				使君子科、榄李属常绿灌木或小乔木, 喜生于中潮滩或高潮滩。影像纹理较平滑, 色调均一, GF-6影像为暗红色, GF-3影像为浅紫色
正红树(Rhizophora apiculata Bl)				常绿小乔木或灌木, 分布于海浪平静、淤泥松软的浅海盐滩或海湾内的沼泽地。影像纹理平滑, 色调均一, GF-6影像为深红色, GF-3影像为蓝色
海漆(Excoecaria agallocha Linn)				大戟科海漆属植物, 常绿乔木, 生于海陆交错区的高潮带或超高潮带的盐碱地上。影像纹理略粗糙, 色调较均一, GF-6影像为浅红色, GF-3影像为蓝绿色

Tab. 2

Fig. 2

Fig. 3

Tab. 3

Multispectral characteristics of GF-6"

遥感特征	名称	公式	出处
光谱波段反射率	B1 ~ B4	$ρ R / ρ G / ρ B / ρ NIR$	—
植被指数	归一化植被指数(NDVI)	$ρ NIR − ρ R ρ NIR + ρ R$	Rouse等(1974)
	增强型植被指数(enhanced vegetation index, EVI)	$2.5 (ρ NIR − ρ R ρ NIR + 6 ρ R − 7.5 ρ B + 1)$	Liu等(1995)
	比值植被指数(ratio vegetation index, RVI)	$ρ NIR ρ R$	Pearson等(1972)
纹理参数	相关性(correlation)	$∑ i, j = 1 N (i − M E) (j − M E) P i, j 2 V ar$	Haralick等(1973)
	同质性(homogeneity)	$∑ i, j = 1 N P i, j 1 + i − j$
	对比度(contrast)	$∑ i, j = 1 N (i − j) 2 ⋅ P i, j$
	标准偏差(standard deviation)	$∑ i 2 p i, j − M E 2$
	二阶矩阵(second moment)	$∑ i, j = 1 N P i, j 2$
	相异性(dissimilarity)	$∑ i, j = 1 N P i, j ⋅ i − j$
	均值(mean)	$∑ i, j = 1 N i ⋅ P i, j$
	信息熵(entropy)	$∑ i, j = 1 N P i, j (− ln P i, j)$

Tab. 3

Tab. 4

SAR characteristics of GF-3"

遥感特征		名称	公式	出处
极化图像波段特征		HH/HV/VH/VV	$S HH$ / $S HH$ / $S HH$ / $S HH$	Souyris等(1995)
极化相关特征		共极化相干因子(polcoe)	$C 11 C 33 C 13$	Henderson等(1998)
		HH与HV相关系数 (ρ_HH-HV)	$S HH S HV * S HH S HH * S HH S HV *$	Souyris等(1995)
		VV与HV相关系数 (ρ_VV-HV)	$S VV S HV * S VV S VV * S HH S HV *$	Souyris等(1995)
		归一化圆极化基相关系数(NCCC)	$1 + 4 Re S HV * S HH − S VV 2 2 S HH − S VV 2 2 − S HV 2 2 1 / 2 ⋅ 1 − 4 Im S HV * S HH − S VV 2 2 S HH − S VV 2 2 + S HV 2 2 − 1 / 2$	杨杰等(2012)
极化分解特征	Freeman分解	体散射分量 (Freeman_vol, F_v)	$3 S VV 2$	Freeman等(1998)
		二次散射分量(Freeman_dbl, F_d)	$β S VV 2 − S HH S ∗ VV β − α$
		面散射分量 (Freeman_surf, F_s)	$α S VV 2 − S HH S ∗ VV α − β$
		雷达植被指数(RVI_Freeman)	$F v F s + F d + F v$
	Yamaguchi分解	体散射分量(Yamaguchi_vol, Y_v)	$154 2 S HV 2 − I m S ∗ HV (S HH − S VV)$	Yamaguchi等(2011)
		二次散射分量(Yamaguchi_dbl, Y_d)	$1 + α 2 β S VV 2 − S HH S ∗ VV β − α$
		面散射分量(Yamaguchi_surf, Y_s)	$1 + β 2 α S VV 2 − S HH S ∗ VV α − β$
		螺旋散射分量(Yamaguchi_cir, Y_c)	$2 I m S ∗ HV (S HH − S VV)$
	H/A/ $α -$ 分解	极化熵H (entropy)	$− ∑ i = 1 2 (λ i λ 1 + λ 2 log 2 λ i λ 1 + λ 2)$	Cloude等(1996)
		极化各向异性A (anisotropy)	$∑ i = 1 2 (λ i λ 1 + λ 2 cos − 1 (e i))$
		极化散射角 $α -$ (alpha)	$λ 1 − λ 2 λ 1 + λ 2$
		Van雷达植被指数(RVI_Van)	$4 λ 3 λ 1 + λ 2 + λ 3$	Zyl等(2016)

Tab. 4

Fig. 4

Fig. 5

Fig. 6

Tab. 5

Tab. 6

Fig. 7

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卫星	传感器	成像时间	波段信息	空间分辨率/m	幅宽/km
高分六号	全色/多光谱相机	2021年5月21日	红(0.63 ~ 0.69μm)/绿(0.52 ~ 0.60μm)/蓝(0.45 ~ 0.52μm)/近红外(0.76 ~ 0.90μm)	8	>90
高分六号	全色/多光谱相机	2021年5月21日	全色(0.45 ~ 0.90μm)	2	>90
高分三号	合成孔径雷达	2021年3月23日	水平发射水平接收/水平发射垂直接收/垂直发射水平接收/垂直发射垂直接收	8	30

	支持向量机		随机森林		极端梯度提升树
	优选特征		优选特征		优选特征		多光谱特征		全极化SAR特征
	PA/%	UA/%	PA/%	UA/%	PA/%	UA/%	PA/%	UA/%	PA/%	UA/%
白骨壤	76.47	65.00	100.00	83.33	94.74	90.00	66.67	50.00	85.71	85.71
海莲	84.93	69.66	86.25	75.82	82.47	89.89	87.38	63.22	79.01	74.42
红海榄	64.86	63.16	83.33	65.79	84.38	71.05	76.67	50.00	71.05	62.79
杯萼海桑	85.71	80.95	86.51	85.83	90.60	84.13	83.78	80.17	64.23	69.91
角果木	82.19	88.24	95.00	98.70	95.59	95.59	88.16	89.33	83.16	90.80
榄李	72.73	74.32	80.55	83.82	85.48	86.89	68.06	77.84	74.25	76.54
木榄	72.67	78.99	72.39	82.27	77.30	78.99	67.84	81.69	69.28	65.84
正红树	90.20	97.87	94.87	90.24	94.00	100.00	91.67	89.80	90.00	91.84
海漆	81.08	85.71	76.66	74.19	88.24	85.71	73.33	64.71	81.82	69.23
总体精度/%	78.23		83.04		86.16		76.22		74.77
Kappa系数	0.7417		0.9800		0.8359		0.7174		0.7033

实验组别	算法参数
SVM+优选特征	Kernel Type: 'RBF' Penalty=185; gamma=0.0001
RF+优选特征	n_estimators=120; max_depth=15; max_features=8
XGBoost+优选特征	learning_rate=0.06; n_estimators=252; max_depth=5; gamma=0.2
XGBoost+多光谱特征	learning_rate=0.09; n_estimators=10; max_depth=5; gamma=0.8
XGBoost+全极化SAR特征	learning_rate=0.09; n_estimators=10; max_depth=6; gamma=0.9

Mangrove species classification in the Hainan Bamen Bay based on GF optics and fully polarimetric SAR

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