广西县(市)域植被覆盖度评价与地理分区

VEGETATION FRACTION EVALUATION AND GEOGRAPHY DIVIDING DISTRICTS OF COUNTY & CITY REGION IN GUANGXI

利用250m分辨率的MODIS遥感数据,采用遥感信息定量化方法,以县、市辖区单元为评价单元建立植被覆盖度评价综合指数模型,计算各县、市辖区的植被覆盖综合指数并利用逐步聚类分析方法进行分组,在GIS平台上实现图形可视化表达地理分区。结果表明:依据植被覆盖综合指数值大小,广西89个县、市辖区被聚类成7个分区;广西西部、北部和东部地区的植被覆盖总体水平较高,中部和南部地区的植被覆盖总体水平较低,植被覆盖水平从西部、北部和东部地区往中部和南部地区存在较明显地从高到低的变化规律。

Using the remote sensing data of MODIS with 250 m resolution, apply a quantitative analysis method to process remote sensing information, build a model of integrative index of vegetation fraction evaluation based on the unit of evaluation of scale. Computed the integrative index of vegetation fraction evaluation of every count and city, divided index into group with the method of K-Means Cluster, and took geography dividing districts into visible image on the platform of GIS. The result show that a total of 89 counties ＆ cities area were cluster divided into seven districts based on the value of integrative index of vegetation fraction evaluation. The total level of vegetation fraction of the west, northern and eastern parts are higher than the southern and central part in Guangxi province. It exist an obvious change discipline about the level of vegetation fraction form high to low, where from the west, northern and eastern parts to tile southern and central part in Guangxi Province.