植被覆盖区羟基和碳酸盐矿物光谱吸收深度校正模型
Vegetation Corrected Continuum Depths Model and Its Application in Mineral Extraction from Hyperspectral Image

为增强植被覆盖区羟基和碳酸盐矿物的吸收特征,提高矿物信息提取精度.通过模拟单像元内新鲜植物、干枯植物、羟 基和碳酸盐矿物的混合光谱,发现在一定波段范围内4种端元的特征波段处吸收深度呈显著线性关系,并建立了羟基和碳酸 盐矿物的植物校正吸收深度(vegetationcorrectedcontinuumdepths,VCCD)模型.将模型应用于黑龙江呼玛的Hyperion影像, 提取了高岭石和方解石矿物信息.在去除河床、道路等干扰信息后,经野外实地验证和室内岩石鉴定,矿物信息提取结果较好.
The objective of this study is to enhance the absorption feature of hydroxy1 and carbonate minerals, and to improve thc prccision of thc mincrals information cxtraction in thc vcgctation covcrcd arca. Thclincar mixing spcctra of a pixc1 contai- ning a hydroxy1/carbonate minera1, green and dry vegetation has been simulated. When a fixed wavelength range is considered, continuum removed absorption depths for diagnostic absorption features of three end-members show significantlylinear rela- tion. The vegelation corrected continuum depths(VCCD) mode1 was eslablished1o detect hydroxy1 or carbonate minera1, which was tested with hyperspectra1 data(Hyperion) co11ected at Huma in Xiaoxing'anling, China. Comparing the extracting minera1 results and field samples of rock, it is found that the extracting minerals information correspond with that of the po1- ished section of minera1, but the disturbance information is found in the river bed or a1ong the road