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 Land-sat-7/ETM+ satellite image of the Luoyuan Bay and the Fuqing Bay.The results show that the observation time of MODISdat a is close to the time of high tidal level and low tidal level,thus the tidal flatre-source monito ring 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 monito ring 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.