Title: Comparison of Vegetation Indices from AVHRR and MODIS in Seasonal Information
Abstract: 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.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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Cited By Count: 3
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