摘要
该研究利用 1981— 1994年的NOAAAVHRR 8km分辨率的NDVI资料 ,以及对应时段全国 10 2个固定农业观测站的 2 0cm深的土壤湿度资料 ,建立了植被状态指数 (VCI)与土壤湿度之间的统计模型 ,由土壤湿度旱情等级标准来换算出每旬用VCI进行干旱监测的旱情等级标准 ,以确定出全国的旬旱情分布状况。在此工作的基础上建成了“全国干旱遥感监测运行系统” ,该运行系统使遥感手段监测全国干旱成为可能 ,将能提供每年 3— 9月每旬全国的干旱监测情况 ,为国家有关决策部门提供干旱减灾的决策依据。
VCIcomputed from NDVIis a recommendatory index usually used in drought monitoring by remote sensing, but it could be different criterion on scaling the drought severity in different region. It is more important to get an objective scaling method forVCIthanVCIitself. By analyzing the historic data (1981-1994) of NOAA AVHRR NDVI(resolution of 8 km) and soil humidity (-20cm) observed by 102 permanent agro-meteorological stations in the whole China, the statistical models have been made out between the vegetation condition index (VCI) and the soil moisture index (SHI). The scales of VCIin determining the drought severity can easily form the ones of SHIin describing the drought through the models, so drought monitoring in every ten days is practical. Based on that, the operational system of drought monitoring by remote sensing in China has been developed , which can be used to monitor the occurrence of the drought in China for every ten days from March to September. It would be beneficial to policy-maker for disaster reduction.
出处
《遥感学报》
EI
CSCD
北大核心
2003年第1期14-18,T001,共6页
NATIONAL REMOTE SENSING BULLETIN
基金
国家重点基础研究发展规划项目 (G2 0 0 0 0 779)
中国科学院知识创新工程项目资助。
