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《Acta Prataculturae Sinica》 2011-04
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Research on validating MODIS/LAI product in a typical semi-arid steppe of Xilinhot in Northern China

WANG Yuan-yuan1,WANG Meng2,3,LI Gui-cai1,WANG Jun-bang2,YANG Zhong-dong1,RONG Zhi-guo1(1.Key Lab of Radiometric Calibration and Validation for Environmental Satellites,China Meteorological Administration(LRCVES/CMA),National Satellite Meteorological Center,Beijing 100081,China;2.Institute of Geographic Sciences and Natural Resources,CAS,Beijing 100101,China;3.Graduate School of Chinese Academy of Sciences,Beijing 100049,China)  
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 μm),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.
【Fund】: 公益性行业科研专项[GYHY(QX)2007-6-9 GYHY200906036];; 国家自然科学基金(40501048)资助
【CateGory Index】: S812.3
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