COMPARATIVE STUDIES IN THE SEASONAL AND DEVELOPMENTAL CHANGE OF LAND-COVER OBSERVED BY SATELLITE DATAS

这个项目由两个主要作业组成。第一个是澄清卫星观测到的土地覆盖的发展变化。第二个是利用卫星数据澄清季节性或年度土地覆盖变化。本研究使用LANDSAT/TM数据，分析光谱反射率值的变化。为了确定LANDSAT数据上的发展变化，确定每个点的土地利用是很重要的。利用GIS地图分析了1975—1998年土地利用数据的变化，并比较了1986—1999年光谱反射率值的变化。结果表明，ndvi值与b1值的函数在大宰府城区具有较好的识别性。根据卫星光谱反射数据分析的土地覆盖数据显示了季节或年度变化。我们对2001年LANDSAT/TM数据进行了检验。土地覆被数据表明，秋冬两季水稻田的光谱反射率变化与城区基本相同。因此，在分析卫星数据时，检查土地覆盖的季节变化是很重要的。

This project composed of two main assignments. The first one is to clarify developmental changes of land-cover observed on satellite data. The second one is to clarify seasonal or annual land-cover changes on satellite data. We used LANDSAT/TM data for this study, to analyze the changes of spectral reflectance values.To identify the developmental change on the LANDSAT data, it is important to confirm land use on each point. We analyzed the change of land use data between 1975 and 1998 by using GIS Map, and compared the change of spectral reflectance values between 1986 and 1999. We concluded that the function of ndvi value and b1value shows best identification, in Dazaifu city area.Land-cover data, analyzed from satellite spectral reflectance data, shows seasonal or annual change. We checked the phenomena to analyze 2001 LANDSAT/TM data. Land-cover data clarify that the spectral reflectance value on paddy field changes almost same value on urban district between autumn to winter. Therefore, it is important to check seasonal change of land-cover to analyze satellite data.