MODIS遥感数据在福建省海岸带滩涂资源监测中的应用研究

以2001~2005年MODIS数据为信息源,每年选取高潮位和低潮位两个时相的MODIS数据,根据滩涂对MODIS 250 m分辨率可见光和近红外探测波数的光谱反应特性,采用波段比值算法来监测福建省海岸带的滩涂面积,并对监测结果用罗源湾和福清湾30 m分辨率的Landsat-7/ETM+影像进行验证分析,结果表明,MODIS数据的观测时间与海洋高低潮位时刻比较接近,便于对滩涂资源的遥感监测.用MODIS数据计算的滩涂面积比用高分辨率的Landsat-7/ETM+数据计算的偏高.卫星遥感监测结果表明从1986至2001年福建省海岸带滩涂面积减少了107 km2,并且从2001至2005年滩涂面积也呈现逐年下降的趋势.

The application of MODIS data in tidal flat resource monitoring of coastal zone of Fujian Province in China

With the MODIS data from 2001 to 2005,areas of the tidal flats in the coastal zone of Fujian Province in China are calculated utilizing the band ratio of MODIS 250 m resolution of visible and near infrared band to high tidal level and low tidal level,and the results are verified by the 30 m resolution Landsat-7/ETM satellite image of the Luoyuan Bay and the Fuqing Bay.The results show that the observation time of MODIS data is close to the time of high tidal level and low tidal level,thus the tidal flat resource monitoring can be done easily.The areas of tidal flats calculated by the MODIS data are larger somewhat in contrast to the high resolution Landsat-7/ETM data.The results of remote sensing monitoring show that the tidal flat areas in the coastal zone of Fujian Province have decreased 107 km2 between 1986 and 2001,and the tidal flat areas also presented a drop tendency year by year from 2001 to 2005.