PROGRESS IN GEOGRAPHY ›› 2007, Vol. 26 ›› Issue (6): 44-55.doi: 10.11820/dlkxjz.2007.06.005

• Original Articles • Previous Articles     Next Articles

Impact of Drought on the Vegetation State Using MODIS/EVI Time- ser ies Data

ZHAO Wei1,2, LI Zhaoliang1   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographical Sciences and Natural Resources Research, CAS, Beijing 100101|
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100049
  • Received:2007-08-01 Revised:2007-10-01 Online:2007-11-25 Published:2007-11-25

Abstract:

MODIS/EVI time series data were selected to analyze the response of vegetation growth to drought in Sichuan and Chongqing provinces in 2006. To remove the cloud contaminated images, the HANTS algorithm was first used to reconstruct cloud- free images. With the cloud- free images and HANTS algorithm’s components (amplitude and phase), the drought influence to the study region was analyzed combined with the land surface meteorological data. Comparing the performance of the drought year and normal years, the result showed that the processed EVI data could reflect the influence of drought to surface vegetation well, and the amplitude and phase could indicate the spatial distribution of drought.

Key words: EVI, HANTS, MODIS, NDVI, Time series data