基于多源遥感卫星数据的桂西北旱情监测研究

Northwestern Guangxi drought supervision based on multi-source remote sensing satellite data

为更好地考虑与干旱有关的参数,在利用MOIDS数据的MYD11A2以及MYD13Q1产品构建VCI和TCI指数的同时,结合风云二号卫星降水数据,利用这3种数据构建归一化旱情状态指数SDCI模型,模型的权重系数通过与农业受旱率的关系来确定。然后分别以VSWI和SDCI指数作为旱情监测指标,分析桂西北2010年3月中下旬的旱情,并与实际旱情资料进行比较判断哪个指数更优。结果表明,利用VSWI以及SDCI在桂西北地区进行遥感旱情监测均是可行的,能直观体现出旱情级别的空间分布情况,但SDCI指数能更好的反映区域旱情。

In order to study the index related to drought, a normalization drought index SDCI model was set up based on three kinds of data including VCI index, TCI index and the precipitation data from No.2 Fengyun （windcloud） satellite, of which VCI and TCI indexes are constituted by the products of MYD 11A2 and MYD13Q1 with MOIDS data. The weighted factors of model are determined according to the relationship with agricultural drought rate. With VSWI and SDCI as drought supervision indexes, the authors analyze the drought occurred in Northwest- ern Guangxi during March 10~30, 2010 and compare the indexes with the actual drought information. Results of comparison demonstrate that it is feasible to carry out drought remote sensing supervision by use of VSWI and SDCI indexes for Northwestern Guangxi. Both VSWI and SDCI can provide directly the drought grade and range information, and SDCI is better for reporting regional drought status.