干旱区生态环境知识资源中心(Arid): 基于野外观测和TM数据的锡林浩特典型草原MODIS/LAI产品验证

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	基于野外观测和TM数据的锡林浩特典型草原MODIS/LAI产品验证
其他题名	Research on validating MODIS/LAI product in a typical semi-arid steppe of Xilinhot in Northern China
	王圆圆 1; 王猛 2; 李贵才 1; 王军邦 2; 杨忠东 1; 戎志国 1
来源期刊	草业学报
ISSN	1004-5759
出版年	2011
卷号	20 期号:4 页码:252-260
中文摘要	通过2008年夏季生长季的3期LAI野外观测和TM图像的处理分析,对锡林浩特国家观象台附近24 km2典型草原区的MODIS/LAI产品精度从时空2种维度进行了评估。结果显示,在时间维度上,MODIS/LAI产品可以较为准确的体现草地植被生长轨迹;在空间维度上,MODIS/LAI产品与TM/LAI反演结果有相似的变化趋势。以TM/LAI结果为参考真值,MODIS/LAI产品的相对均方根误差约为24%,并存在10.8%的正偏差,表明有一定程度的高估。误差分析结果显示,MODIS/LAI产品精度主要受到土壤背景光谱以及地表均匀程度的影响,在LAI较小的区域,以及在草地空间异质性因受人类活动而增强的7月初和8月末,MODIS/LAI产品误差更大。
英文摘要	MODIS/LAI product in a typical semi-arid steppe of Xilinhot in Northern China was validated based on three comprehensive field surveys which were carried out during July-August 2008 in the study area.LAI was measured in 25 m*25 m plots by a destructive harvest method of 80 intensive plots and 20 scattered plots.Three TM/ETM+ images acquired during the field survey periods were collected and processed.The validation work covered two parts:Time series analysis and spatial pattern analysis.In time series analysis,MODIS/LAI track in the intensive sampling region extracted from DOY169 to DOY241 were compared with ground measured values.In spatial pattern analysis,LAI map with 30 m spatial resolution were first derived by building a regression line between LAI and TM band 5(1.6 mum),and then aggregated to 1 km spatial resolution based on MODIS grids.Results indicated that in the temporal domain MODIS/LAI product can correctly reflect grass growth trends;In the spatial domain it showed a similar pattern with TM/LAI(1 km).Using the TM/LAI as reference,the relative RMSE of MODIS/LAI was about 24% and a positive bias(10.8%)existed,suggesting slight over-estimation.Error distribution analysis revealed that the MODIS/LAI product was less accurate in regions with lower LAI values,probably due to soil contamination.Moreover,the relative RMSE of the MODIS/LAI product was higher at the beginning of July and the end of August when the heterogeneity of grass cover increased as a result of human activities
中文关键词	MODIS/LAI产品 ; TM/ETM+数据 ; 典型草原
英文关键词	MODIS/LAI product TM/ETM+ data typical steppe
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:4285701
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226221
作者单位	1.中国气象局, 中国遥感卫星辐射测量和定标重点开放实验室, 北京 100081, 中国; 2.中国科学院地理科学与资源研究所, 北京 100101, 中国
推荐引用方式 GB/T 7714	王圆圆,王猛,李贵才,等. 基于野外观测和TM数据的锡林浩特典型草原MODIS/LAI产品验证[J]. 中国科学院地理科学与资源研究所,2011,20(4):252-260.
APA	王圆圆,王猛,李贵才,王军邦,杨忠东,&戎志国.(2011).基于野外观测和TM数据的锡林浩特典型草原MODIS/LAI产品验证.草业学报,20(4),252-260.
MLA	王圆圆,et al."基于野外观测和TM数据的锡林浩特典型草原MODIS/LAI产品验证".草业学报 20.4(2011):252-260.