内蒙古锡林浩特草原GLASS LAI产品的真实性检验  

Validation of the GLASS LAI Products in Xilinhot Grassland

作　　者：孙晨曦[1] 刘良云[1] 关琳琳[1] 

机构地区：[1]中国科学院遥感与数字地球研究所,北京100094

出　　处：《遥感技术与应用》2013年第6期949-954,共6页Remote Sensing Technology and Application

基　　金：国家自然科学基金项目(41222008);国家863计划项目(2009AA122100)

摘　　要：结合内蒙古锡林浩特草原区域的实地测量数据和Landsat TM高分辨率遥感数据,对两景GLASS LAI产品进行真实性检验,同时以MODIS LAI产品为比照。结果表明:①GLASS LAI产品和MODIS LAI产品均高估,其中7月中旬GLASS LAI产品高估约11%,其高估的程度明显小于MODIS LAI(高估约36%),而8月末两者高估的程度相似;②GLASS LAI产品与Landsat TM反演LAI产品有较好的一致性,两期数据的决定系数R2分别达到0.72和0.58,优于MODIS LAI产品(0.61和0.27);③GLASS LAI和MODIS LAI两个产品的误差主要来自于模型的准确性,真实性检验中数据定量化误差小于5%。结论表明:GLASS LAI产品数据在锡林浩特草原区域的观测精度和一致性都优于MODIS LAI产品数据,更适用于相关研究。GLASS is a series of products newly produced by domestic team,which needs validation before further application. Validation of GLASS I.AI products is implemented by field measurements in Xilinhot grassland and corresponding Landsat TM data. Besides,validation of MODIS I.AI product is taken as a con trast. The results of validation indicate the over-estimation of both GLASS LAI and MODIS LAI. GLASS LAI in the mid-July over estimates LAI is about 11% ,which is obviously smaller than MODIS LAI （36% over estimation）,and the both products in the end of August show the similar extent of over-estimation. GLASS LAI products consist better with the LAI inverted by Landsat TM,and the determination coeffi- cients R2 of the two periods are respectively 0.72 and 0.58,which are both larger than MODIS LAI prod ucts （0.61 and 0.27）. According to the analysis,the main source of the error of both products,GLASS LAI and MODIS LAI,is the models＇ accuracy,and the error from the data quantification is only less than 5%. These results suggest that GLASS LAI products in Xilinhot grassland have better accuracy and consisten cy,and are more applicable than MODIS LAI products.

关 键 词：叶面积指数 遥感产品 真实性检验 GLASS MODIS 锡林浩特草原 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]