水体的多角度偏振波谱特性及其在水色遥感中应用

doi:10.3964/j.issn.1000-0593(2010)02-0448-05

CORC > 北京大学 > 地球与空间科学学院

	水体的多角度偏振波谱特性及其在水色遥感中应用; The multi-angle polarization spectral character of water and its applications in water color remote sensing
	吴太夏 ; 晏磊 ; 相云 ; 赵云升 ; 陈伟
刊名	光谱学与光谱分析
	2010
关键词	光谱偏振多角度遥感水色 Spectrum Polarization Multi-angle Remote sensing Water color
DOI	10.3964/j.issn.1000-0593(2010)02-0448-05
英文摘要	清洁水体光谱在可见光和近红外波段的反射率比较低,其光谱特征不明显,在光学遥感图像上水体一般都表现为暗色调,造成了利用光谱学手段进行水体遥感识别和水质参数反演的困难。在研究水体的偏振波谱时作者发现,在对水体进行多角度观测时,水体在可见光与近红外波段的偏振度波谱值要远大于其无偏的反射率,表现在图像上即水体的偏振度图像的亮度要远大于其强度图像的亮度,文章对这种现象和规律进行了物理学解释,并利用法国PARASOL多角度偏振卫星遥感图像数据对这个规律进行了验证。该文首次揭示了利用多角度偏振遥感进行水体探测的优势,该方法有效解决了在利用光学遥感进行水体探测时反射率低的难题,大大提高水体的遥感识别能力和水质...; The reflectance of pure water is very low at visible and near infrared bands. Its spectral characteristics are not obvious. Water always shows dark hue in optical remote sensing images. This dark hue causes the difficulties in water remote sensing identification. There is an interesting phenomenon when the authors research the water polarization spectroscopy. The authors measured water's polarization spectra and reflectance spectra at different view zenith angles using the ASD spectrometer. When the view zenith angle was zero (measured vertically), as the spectrum people commonly measure, there was no polarization phenomenon at the water surface, and the reflectance was low at each band. Along with the increase in view zenith angle, the DOP spectra curves increased evidently, while the reflectance curves only changed a little. When the view zenith angle was over 30 degree, the values of DOP spectrum were much larger than the reflectance spectrum values at the entire visible and near infrared bands. At some bands, the DOP value was several dozen times than its reflectance value. This phenomenon shows that the water's brightness in DOP image is much higher than its brightness in intensity image under the same condition. This rule was verified by the PARASOL multiangle polarization satellite data. Comparing the average brightness of DOP images with the average brightness of intensity images at 490, 670 and 865 nm band, the former is higher than the latter apparently. The brighter DOP images are better for water remote sensing identification It is the first time that the authors found this special multiangle polarization spectral character of water. It revealed the advantage of water detection using the multiangle polarization remote sensing data. This method solved the low reflectivity problem of water color remote sensing. It will greatly improve the capability of water remote sensing identification and the retrieval accuracy of water quality parameters.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000274321800036&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); EI; PubMed; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 3; 02; 448-452; 30
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/48536]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	吴太夏,晏磊,相云,等. 水体的多角度偏振波谱特性及其在水色遥感中应用, The multi-angle polarization spectral character of water and its applications in water color remote sensing[J]. 光谱学与光谱分析,2010.
APA	吴太夏,晏磊,相云,赵云升,&陈伟.(2010).水体的多角度偏振波谱特性及其在水色遥感中应用.光谱学与光谱分析.
MLA	吴太夏,et al."水体的多角度偏振波谱特性及其在水色遥感中应用".光谱学与光谱分析 (2010).