摘要
积雪是地表覆盖的重要部分,目前用于积雪监测的卫星主要是EOS/MODIS,NOAA/AVHRR,FY等。本文分别介绍了EOS/MODIS及NOAA/AVHRR的积雪监测模式。在MODIS的积雪算法中主要运用归一化差分积雪指数(NDSI)和反射率,其中用NDSI来区分雪与云,而NOAA/AVHRR利用可见光波段和近红外波段的信息作为积雪监测的基础,以此来区分高云、中云、低云和积雪,然后从两种卫星在时空分辨率等方面做对比,得出二者分别在积雪监测方面的优点和不足之处。
Snow is a very important part on the earth. In China,the main satellites used for snow monitoring are EOS/MODIS, NOAA/AVHRR and FY serials meterological satellites. This paper mainly introduces the mode of MODIS and NOAA/ AVHRR. The NDSI and Reflectivity are used in MODIS. And NDSI is used to divided snow from cloud. But the information of the light wave segment and near red and outside wave band is the foundation of the NOAA/AVHRR. According to it,we can divide snow from high cloud, middle cloud, low cloud. After making comparison between NOAA and MODIS, we obstain the advantages and disadvantages in snow monitoring finally and make a theoretic base for snow monitoring.
出处
《水土保持研究》
CSCD
北大核心
2008年第3期220-222,225,共4页
Research of Soil and Water Conservation
基金
国家自然科学基金项目(70361001)
