基于NOAA/AVHRR和Terra/MODIS数据的植被指数季节信息比较  

Comparison of Vegetation Indices from AVHRR and MODIS in Seasonal Information

作　　者：郝成元[1] 马春艳[1] 朱宗泽[1] 

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000

出　　处：《地理与地理信息科学》2009年第6期30-33,共4页Geography and Geo-Information Science

基　　金：河南理工大学博士基金(B2006-11);国家重点基础研究计划资助项目(2003CB415101)

摘　　要：依据云南省中部地区的气候系统和地形地貌的区域差异,选择西南山地和东部高原地区为对比区,应用Arc-GIS 9.2点面结合分析了AVHRR-NDVI、MODIS-NDVI及MODIS-EVI 3种植被指数对植被季节性变化的敏感度。结果显示:MODIS-EVI在消除影响因素方面效果最好,其与植被覆盖度的线性关系得到明显改善,尤其是在高植被覆盖区表现良好,既避免了植被指数饱和问题的产生,又削弱了大气云雨、地形地貌及土壤背景的影响程度,为遥感定量研究陆地植被提供了数据保证,尤其是涉及有关植被季节性信息的研究。With the widening of vegetation indices applying in geoscience,their capability of reflecting the state of vegetation should be improved in various degrees.According to regional differentiation in both climatic system and topographical terrain in the mid-south of Yunnan Province of China,four sample plots were selected,evenly lied in between the southwestern Yunnan in Heduan Mountains and the eastern Yunnan Plateau.Under the help of ArcGIS9.2,a time series of vegetation indices data had been established,which come from Moderate Resolution Imaging Spectroradiometer （MODIS） and Advanced Very High Resolution Radiometer （AVHRR）. And that, the advantage of three indices monitoring vegetation was compared by analyzing their time series data of particular points and different subregions, including AVHRR-NDVI, MODIS-NDVI and MODIS-EVI, especially in comparison of seasonal dynamics changes. It has been found that MODIS-EVI does best in the elimination of external disturbance. Firstly, it obviously improves the linear relationship with vegetation cover degree, especially in the high vegetation coverage area. Secondly, it avoids the emergence of vegetation index saturation. Thirdly, it reduces the environmental influence degree including both the effects of atmosphere and landform. So it is believed that time series of MODIS-EVI profile is the best of all these vegetation indices for reflecting vegetation seasonal information because it can reflect the dynamics of crop growth and development. It is predicted that it could be used to monitor and assess the growth and development of vegetation combined with different plants procreant stages.

关 键 词：AVHRR MODIS 归一化植被指数 增强植被指数 植被季节性信息 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]