用MODIS植被指数研究福州城区空间扩展变化

城区空间的扩展变化对人居环境产生的影响越来越受到人们的关注。利用2001-2005年美国EOS卫星的MODIS遥感资料，以福州市为示范区，逐年计算能反映城区植被覆盖变化的比值植被指数、差值植被指数、归一化植被指数和植被覆盖度，在地理信息系统（GIS）和全球定位系统（GPS）的辅助下，对福州市各种植被指数的年际动态变化过程进行了研究，并在此基础上对福州市的城区空间扩展变化情况进行遥感动态监测，同时结合社会经济统计数据加以分析。结果表明：福州市从2001年到2005年，城区空间扩展约29km^2，每年平均扩展约7．3km^2，与实际情况一致。利用MODIS资料能准确地监测城区空间扩展变化面积的大小。

Using MODIS Vegetation Index to Study Urban Expansion and Change

It has been more and more noticed by people that the urban expansion and change impact urban environments. Take Fuzhou City as a demonstration case, the RVI, DVI, NDVI and VCI, which indicate urban vegetation coverage change, are calculated every year by using MODIS data of EOS satellite during 2001-2005. With the help of GIS and GPS, the interannual dynamic changes of different vegetation index in Fuzhou are researched, and urban expansion and change in Fuzhou are monitored based on MODIS data. At the same time, the research results are analyzed with socio-economic data. The results show that the urban expansion areas in Fuzhou have increased by about 29km2 between 2001 and 2005, about 7.3km2 each year. The above results are credible in comparison with the real situation. The urban expansion areas can be monitored correctly by using MODIS data.