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(vegetation corrected continuum depths,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 hydroxyl and carbonate minerals, and to improve the precision of the minerals information extraction in the vegetation covered area. The linear mixing spectra of a pixel containing a hydroxyl/carbonate mineral, 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 significantly linear relation. The vegetation corrected continuum depths （VCCD） model was established to detect hydroxyl or carbonate mineral, which was tested with hyperspectral data （Hyperion） collected at Huma in Xiaoxing＇anling, China. Comparing the extracting mineral results and field samples of rock, it is found that the extracting minerals information correspond with that of the polished section of mineral, but the disturbance information is found in the river bed or along the road.