毛竹林HJ-1HIS专题信息的响应与识别

Response and Recognition of the Spectral Information of Bamboo Phyllostachy sedulis Based on HJ-1HIS Data

受目标地物分布地形影响和高光谱的可达10-2λ的光谱敏感性响应等因素影响,高光谱影像中存在严重的信息重叠现象,增加地物的识别难度。通过分析毛竹林与马尾松、杉木、硬阔、经济林等主要森林类型在HJ-1 HIS影像中的光谱相似性、可分性,确定出可适用于毛竹信息提取的高光谱波段,并比对毛竹专题信息提取精度。结果表明,毛竹与马尾松、杉木、硬阔、经济林4种森林类型的原始光谱曲线规律基本一致,光谱差异较小;光谱变换后,在波长753~765 nm和908~917 nm处,各森林类型间光谱差异明显,毛竹与其他森林类型在第1、2、5、9、10、45、59、60、61、109、110、111、112、113、114、115等波段具有较好的可分性,这些波段可用于毛竹专题信息的提取,所选特征波段组合的图像较原始图像的分类总精度提高12.61%,提取竹林面积共计34 117 hm^2。

Affected by distribution topography of target objects and spectral sensitivity response of accessibility of hyperspectrum 10-2λ,there is a serious overlapping informationin hyperspectral image,increasing the difficulty of identifying surface features. Hyperspectral bands of applicable to the extraction of bamboo Phyllostachy sedulis information were determined by analyzing the similarity and separability of spectra of HJ-1 HIS image among bamboo Phyllostachy sedulis,Pinusmassoniana,Cunninghamialanceolata,hardwoodforest and economic forest,further to obtain the accurate extraction of bamboo Phyllostachy sedulis information.The results revealed that the regularity of original spectrum curve of bamboo Phyllostachy sedulis was consistent with that of Pinusmassoniana,Cunninghamialanceolata,hardwood forest and economic forest,and the differences of spectra were significant.After transform of spectra,the differences in spectra of all kinds of forests were significant in the wavelength of 753-765 nm and 908-917 nm,and bamboo Phyllostachy sedulis had good separability compared to other forest in the band of 1,2,5,9,10,45,59,60,61,109,110,111,112,113,114,115,which can be used to extract the thematic information of bamboo Phyllostachy sedulis.Moreover,the overall classification accuracy of the image that was combided with selected characteristic bands increased by 12.61% compared with that of the original image,and the extracter area of bamboo Phyllostachy sedulis was 34 117 hm^2.