基于HJ-1B/CCD地表反照率的估算  

Surface Albedo Estimating Based on HJ-1B/CCD

作　　者：王寸婷[1] 张友静[1,2] 钱志奇 陈静欣[4] 曹明[1] 

机构地区：[1]河海大学地球科学与工程学院,江苏南京210098 [2]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [3]江苏省地质勘察技术院信息中心,江苏南京210008 [4]江苏省测绘产品质量监督检验站,江苏南京210013

出　　处：《地理与地理信息科学》2013年第5期12-16,共5页Geography and Geo-Information Science

基　　金：国家973计划项目(2010CB951101)

摘　　要：地表反照率是入射太阳能被地表反射的比分,决定地表吸收太阳辐射能的多少,是影响地表能量收支的关键参数。该文使用6S大气辐射传输模型对环境星的多光谱CCD数据进行大气纠正,并利用其观测角度信息,分别基于统计模型和BRDF模型估算研究区不同地表覆盖类型的窄波段地表反照率,并实现窄波段向宽波段反照率的转换。将宽波段反照率与MODIS反照率产品数据进行对比分析,对不同的地表覆盖类型选择模型的适宜性做出分析评价:对于水体,基于朗伯面假设采用统计模型效果较好,相对误差为9.2%;对于植被及非植被覆盖区,采用二向反射模型较合适,相对误差分别为4.02%和5.6%,都能够满足应用需求。Surface albedo is the ratio that the surface reflects incident solar energy. It determines how much the surface absorbs solar radiation and it is a key parameter affecting the surface energy budget. It makes atmospheric correction to HJ-1B＇s multi- spectral CCD data using 6S atmospheric radiative transfer model. Using CCD data and its observation angle information, the pa- per estimates narrow-band surface albedo of different surface coverage type based on the statistical model and the BRDF model respectively, and realizes the conversion of narrow band to broadband albedo finally. It makes comparative analysis with MODIS^s albedo product data, then analyzes and evaluates the suitability of model selection of different land cover types： for wa- ter,it is better using the statistical model which based on the Lambert surface hypothesis and the relative error is 9.2%. Bidirec- tional reflectance model is more suitable for vegetation and non-vegetation coverage areas and the relative error were 4.02%and 5.6% respectively, they can meet the application requirements.

关 键 词：地表反照率 中等分辨率 统计模型 二向反射模型 

分 类 号：P184.51[天文地球—天文学] TP79[自动化与计算机技术—检测技术与自动化装置]