摘要
运用高光谱遥感技术分析地物特有的光谱特征可以有效地对地物进行识别。以河北省唐山市曹妃甸湿地为研究对象,使用SR2500便携式地物光谱仪测定了2种典型湿地植被——翅碱蓬[ Suaeda salsa (L.) Pall.]和芦苇[ Phragmites australis (Cav.)Trin.ex Steud.]的光谱特征,并对2种湿地植被的原始反射率光谱曲线和经过包络线去除法变换后的反射率光谱曲线进行研究。结果显示:由于包络线去除法的限制,在340~380 nm和716~1 020 nm波段范围内,分析芦苇原始光谱曲线更容易区分植被所处的生长期,在340~595 nm和710~920 nm波段范围内,分析翅碱蓬的原始光谱曲线更有利于区分所处的生长期,且2种植被生长旺盛期的反射率均高于生长末期。在508、550、678 nm处利用包络线去除法能够更好地区分芦苇不同生长阶段,在638、678 nm处利用包络线去除法能更好地区分翅碱蓬不同生长阶段。芦苇在绿光波段550 nm处出现明显的反射峰,而翅碱蓬在红光波段638 nm处出现明显的反射峰,这使得2种植被经过包络线去除处理后更好区分。在753~1 020 nm波段范围内,分析原始光谱曲线更适于区分芦苇和翅碱蓬,且芦苇的反射率高于翅碱蓬。
Analysis into the unique spectral features of the ground objects can effectively identify the ground objects by using hyperspectral remote sensing technology.In the present study,the Caofeidian wetland in Tangshan City,Hebei Province was selected as the research object.The spectral characteristics of two typical wetland vegetations, Suaeda salsa (L.) Pall.and Phragmites australis (Cav.)Trin.ex Steud.,were identified by SR2500 portable ground spectrometer.The original reflectance spectral curves of the two wetland vegetations and the reflectance spectral curves transformed by the envelope removal method were studied.It was shown that,due to the limitation of the envelope removal method,it was easier to distinguish the growth curve of the original vegetation of Phragmites australis in the range of 340-380 nm and 716-1 020 nm.In the range of 340-595 nm and 710-920 nm,the analysis of the original spectral curve of Suaeda salsa was more favorable to distinguish the growth periods.The reflectivity of the two vegetations in the vigorous growth period was higher than that in the terminal growth period.The envelope removal method at 508,550 ,678 nm could better distinguish the growth periods of Phragmites australis ,and the method of envelope removal at 638,678 nm could better distinguish the growth periods of Suaeda salsa .For the two vegetations,the Phragmites australis had a distinct reflection peak at 550 nm in the green light band,while the Suaeda salsa had an obvious reflection peaks at 638 nm in the red light band,which made the two vegetations easier to distinguish after the treatment of envelope removal.In the range of 753-1 020 nm,the analysis of the original spectral curve was more suitable to distinguish the two vegetations,and the reflectivity of Phragmites australi was higher than that of Suaeda salsa .
作者
王美玲
焦琳琳
王晓红
吴兵
肖星星
WANG Meiling;JIAO Linlin;WANG Xiaohong;WU Bing;XIAO Xingxing(Graduate School,North China University of Science and Technology,Tangshan 063200 ,China)
出处
《浙江农业学报》
CSCD
北大核心
2019年第6期963-969,共7页
Acta Agriculturae Zhejiangensis
基金
华北理工大学博士基金(25395501)
关键词
高光谱遥感
芦苇
翅碱蓬
光谱特征
包络线去除
hyperspectral remote sensing
Phragmites australi (Car.) Trin.ex Steud.
Suaeda salsa (L.) Pau.
spectral characteristics
envelope removal
