摘要
高光谱遥感能提供数十至数百个窄波段的光谱信息,从而能够依据地物的诊断性光谱特征进行地物识别。然而,高光谱遥感在提供丰富光谱信息的同时,波段间的相关性和冗余性制约着高光谱遥感的应用。因此,特征参数选择是高光谱遥感分类中最关键的环节之一。首先讨论EO-1/Hyperion的传感器特征,并对其L1R数据进行辐射校正、去条纹、Smile效应纠正等预处理工作。其次利用从图像中提取的典型地物的光谱曲线,采用光谱重建理论获得用于逼近光谱曲线的基函数及其对应的光谱区间。然后采用逐步增加光谱区间,并调整波段中心位置和宽度的方法,得到稳定的光谱区间。最后将光谱区间内的几个原始高光谱波段合成一个宽的波段,得到几个较宽波段的仿真图像,并对其进行分类。结果表明,基于光谱重建的特征参数选择方法获得的分类,总体精度高达92%,充分说明了该方法的有效性。
Developments in detector technology and microelectronics present new opportunities for remote sensing. For example, the spaceborne Hyperion, flown on EO-1 satellite, acquires image data in 220 spectral bands over the spectral range of 0. 4-2. 5μm at approximately 0. 01μm spectral resolution with 30m spatial resolution. Those hyperspectral data can provide abundant information, and make it possible to detect diagnostical spectral characteristics, such as red-edge drift, etc. However, there is relatively high correlation between different bands and much redundancy in hyperspectral data sets. Therefore, one of the most important procedures is to select optimal bands for extracting information from hyperspectral data effectively.
In this paper, we first discuss the characteristics of EO-1/Hyperion instrument, and apply several important pre-processing procedures to Hyperion LIR data, such as radiometric calibration, destriping, smile correction, and geometric correction, etc. Then we apply spectrum reconstruction approach, which uses several basis functions and corresponding spectral intervals to describe the spectrum extracted from Hyperion hyperspectral data sets in Subei region, China. The feature selection method based on spectrum reconstruction is incrementally adding bands to the initial bands, followed by adjustment of band widths and locations. At last, we can aggregate several Hyperion bands into a new simulated band in each interval and apply MLC image classification methods to it. The overall accuracy can be as high as 92% compared with in situ measurement, which supports the validity of this feature selection method.
出处
《遥感学报》
EI
CSCD
北大核心
2007年第4期589-594,共6页
NATIONAL REMOTE SENSING BULLETIN
基金
国家自然科学基金项目(编号:40271048)
国家"863"项目(编号:2002AA130010-1-4)
关键词
特征参数选择
光谱重建
基函数
光谱区间
feature selection
spectrum reconstruction
basis function
spectral interval
