基于RS和GIS的上海市植被覆盖变化特征研究

利用1997、2000和2002年的Landsat TM/ETM 遥感数据,计算了归一化差异植被指数(NDVI)并剔除植被伪变化信息,同时结合GIS空间分析功能较为详细地研究了近几年来上海城市植被覆盖的动态演变特征.结果表明:市区植被覆盖变化不大,面积总体呈现增加趋势;与市区相比,郊区的植被覆盖变化较为明显且减少面积较多;植被减少部分主要为耕地,主要对应城镇和工业用地的扩展区,增加部分主要是林地和草地;市区和浦东新区一些工矿用地和未利用地转化为草地在很大程度上增加了植被面积.

Research on the Vegetation Cover Change in Shanghai Based on RS and GIS

Based on the multiple-temporal Landsat TM/ETM data,the Normalized Difference Vegetation Index(NDVI) is calculated and false information of vegetation cover change is eliminated.This paper analyses the dynamic changing characteristics of vegetation in Shanghai in recent years and with the aid of GIS,a further research is given to the relationship between vegetation cover and land use change.Some results are summarized as follows: compared with suburbs,the vegetation change in downtown areas is not so obvious,at the sametime,with total increase of vegetation.On the contrary,an obvious vegetation decrease is detected in suburbs.Different types of land use have different NDVI values;the expansion of township and industrious areas is the major reason for vegetation decrease,especially in suburbs.The increasing greenbelt in downtown areas has a large contribution to the vegetation increase;A GIS analysis of each 500-meter buffer zone away from major roads shows that the density of vegetation declines rapidly as distance increases from roads.