| 南方冬季湿雪的光谱特征分析 |
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| 引用本文： | 钱昊,柯长青.南方冬季湿雪的光谱特征分析[J].冰川冻土,2015,37(6):1515-1523. |
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| 作者姓名： | 钱昊 柯长青 |
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| 作者单位： | 江苏省地理信息技术重点实验室/南京大学 地理与海洋科学学院, 江苏 南京 210023 |
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| 基金项目： | 国家自然科学基金项目(41371391)；江苏高校优势学科建设工程项目资助 |
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| 摘 要： | 使用FieldSpec4便携式地物光谱仪获取了南京地区冬季湿雪的光谱数据, 并从太阳高度角、坡度、坡向、下垫面及混合雪几个方面进行了分析. 结果表明: 积雪的反射率在可见光区变化平稳, 在近红外区下降迅速, 1 020 nm、1 250 nm附近是积雪反射率的吸收区; 湿雪状态下, 太阳高度角增大的同时积雪反射率逐渐降低, 而在水湿雪状态下太阳高度角对反射率影响减弱, 积雪含水率成为其变化的主要影响因素; 积雪反射率随着坡度的增大而增大; 积雪在朝阳坡的反射率远高于背阴坡, 背阴坡积雪反射率在可见光谱区受影响较大; 当积雪厚度达到一定值后下垫面的差异对反射率影响有限, 否则会对反射率产生较大影响; 在可见光波段纯雪反射率最高, 近红外波段植被/积雪混合反射率最高, 林下雪的光谱反射率较低. 南京地区湿雪光谱测量和分析对了解南方湿雪光谱特性和变化规律, 以及对于积雪定量遥感及其参数反演具有重要意义.
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| 关 键 词： | 南方冬季湿雪 光谱测量 光谱分析 光谱特征 |
| 收稿时间： | 2015-08-29 |
| 修稿时间： | 2015-11-15 |
Analysis of the spectral characteristics of winter wet snow in southern China |
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| QIAN Hao,KE Changqing.Analysis of the spectral characteristics of winter wet snow in southern China[J].Journal of Glaciology and Geocryology,2015,37(6):1515-1523. |
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| Authors: | QIAN Hao KE Changqing |
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| Institution: | Jiangsu Provincial Key Laboratory of Geographic Information Science and Technology/School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China |
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| Abstract: | In China,the study of spectral characteristics of snow is more concentrated in northern areas,while the study of wet snow in southern areas is relatively rare.In this paper,the Fieldspec4 portable spectrometer was used to collect spectrum data of winter wet snow in Nanjing City,and the influences of solar elevation angle, slope,aspect,underlying surface and mixed snow and vegetation on snow reflectance were analyzed.The result indicates that snow reflectance changes smoothly in visible band and decreases rapidly in near-infrared region. There are absorption regions of snow reflectance near 1 020 nm,1 250 nm.In the state of wet snow,snow re-flectance decreases as the solar elevation angle increases.While the moisture content has much more influence on snow reflectance than the solar elevation angle in the state of water wet snow.Snow reflectance of sunny slope rises significantly with the increase of slope,and it is far higher than that in shady side.The difference of several underlying surfaces has limited influence on snow reflectance when the snow depth reaches a certain value,other-wise it will have a significant impact.Pure snow reflectance is the highest in visible band,and in near-infrared band snow reflectance from mixed snow and vegetation is the highest.Before the curves intersect,snow reflec-tance from mixed snow and vegetation increases gradually when the snow coverage rate on the vegetation increa-ses.With the intersection moves forward,the reflectance comes closer to the pure snow reflectance.In addition, snow reflectance from snow under forst is the lowest.The measurement and analysis of winter wet snow reflec-tance in Nanjing City are of great significance for acquainting spectral characteristics and variation regularity,as well as snow quantitative remote sensing and its parameters inversion. |
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| Keywords: | winter wet snow in southern China spectral measurement spectral analysis spectral characteristics |
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