摘要
为了分析2006年四川重庆地区夏季干旱对该地区植被生长的影响,选取该地区多年中分辨率成像光谱仪(MODIS)增强植被指数(EVI)时间序列数据进行研究,利用时间序列谐波分析(HANTS)算法对EVI数据进行去云处理,并根据处理后的结果(重构的EVI数据以及HANTS分析得到相应频率对应的振幅和相位),分析干旱对该地区的影响,同时结合地面气象数据加以补充说明。将干旱年份和正常年份对比分析,结果表明,处理后的EVI时间序列数据能较好地反映干旱对地表植被的影响,振幅和相位的空间分布特征能够很好地反映干旱的影响范围。
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.
出处
《地理科学进展》
CSCD
北大核心
2007年第6期40-47,I0008,共9页
Progress in Geography
基金
中国科学院2003年度"百人计划"项目
国家杰出青年科学基金项目(40425012)