ESTIMATION OF VEGETATIVE SURFACE ALBEDO IN THE KUSHIRO MIRE WITH LANDSAT TM DATA ──A New Approach to Atmospheric and Spectral Corrections

Key words: 
• mire vegetation /
• surface albedo /
• Landsat images /
• remote sensing

Abstract: A method has been developed for estimating the filtered narrow band surface albedo with Landsat/TM date. In this method, the surface albedo from fitered range of Landsat/TM is converted to the surface albedo with unfiltered spcectral range. The atmospheric effects on each channel are systematically different, because of the different spectral behavior of atmospheric parameters.As a result, in this study, atmospheric correction has ho done respectively in different parameters for visible and infrared channels. The surface albedos of the Kushiro Mire gotten with this method were compared with the observed date there. The results show that the satellite inferred albedos have a good agreement tO the diurnal mean of ground observed albedos with 3% systematic error. There is a seasonal variation of albedo in high and low mires, the albedo decreased gradually from April to July and reached its minimum in July, further it rose gradually from August to October. It is also clear that there is a characteristic pattern of surface distribution according to the vegetation types of this area. The average surface albedos of each type of community are 0.164 for Sphagnum, 0.175 for Carex, 0.179 for Pragmites and 0.166 for Alnus. In the other words, the albedo in high mire (mainly covered by Sphagnum) is lower than that in low mire (mainly covered by phragmites and Carex).