国土资源遥感2018，Vol.30Issue(1)：14-21,8.DOI:10.6046/gtzyyg.2018.01.03
MODIS,CYCLOPES和GLASS 3种LAI产品在韩江流域的对比
Comparison of MODIS,CYCLOPES and GLASS LAI over Hanjiang River basin
摘要
Abstract
Leaf area index (LAI) is a primary parameter for characterizing vegetation canopy structure. Since LAI can affect many vegetation ecological processes,such as transpiration,interception and energy exchange,it is used as a critical input for ecological models and land surface process models. At present, several global LAI datasets have been generated from different satellite remote sensing data,such as AVHRR,MODIS and VEGETATION,by different retrieval methods. MODIS, CYCLOPES and GLASS LAI datasets are those with higher spatial and temporal resolution. The spatial and temporal consistency of MODIS, CYCLOPES and GLASS LAI datasets was analyzed over Hanjiang River basin,which is covered with several vegetation types. Comparative study revealed the following characteristics: ① CYCLOPES LAI was observed to contain a large number of missing pixels, while MODIS and GLASS LAI products were more spatially and temporally complete. MODIS LAI contained many invalid pixels,whose LAI became much smaller abruptly in comparison with the LAI values just before or after this time.② The spatial distributions of MODIS, CYCLOPES and GLASS LAI were mainly consistent with the vegetation types of the basin. The spatial distributions of MODIS and GLASS LAI were more consistent than those of CYCLOPES LAI. MODIS LAI was larger than GLASS LAI in forest pixels, while it was contrary in other pixels. CYCLOPES LAI was much smaller than MODIS and GLASS LAI in forest pixels. ③ MODIS, CYCLOPES and GLASS LAI products generally depicted similar temporal trajectories. GLASS LAI had the smoothest and completest trajectories,while the trajectories of MODIS LAI contained a large number of erratic fluctuations. All of these three LAI products depicted similar seasonal changes for different vegetation types. Compared with CYCLOPES LAI, a good agreement was achieved between MODIS and GLASS LAI values.关键词
叶面积指数/植被类型/时间序列/季节变化/韩江流域Key words
leaf area index (LAI)/vegetation types/time series/seasonal change/Hanjiang River basin分类
计算机与自动化引用本文复制引用
刘远,周买春..MODIS,CYCLOPES和GLASS 3种LAI产品在韩江流域的对比[J].国土资源遥感,2018,30(1):14-21,8.基金项目
国家自然科学基金项目"概念性水文模型与分布式水文模型的结合——以新安江模型和TOPMODEL模型的互补为例"(编号:41171029)资助. （编号:41171029）
