抄録
Minnaert correction method is one of the most appropriate models that correct topographic effects on remotely sensed data. However, the variations of the Minnaert constants have not been examined for any forest types. The purpose of this research was to investigate the extent of the variation of the Minnaert constant in three different forest types. Three forest types were selected for the analysis ; broad-leaved natural forest, coniferous plantations, and bamboo forest. 7 scenes of SPOT/HRV data observed in 1997 were selected and orthorectified with digital elevation models and digital topographic maps. The Minnaert constants were obtained through a regression analysis between solar incidence angles and the original satellite data. The results showed bands 1 and 2 indicated the seasonal variation of Minnaert constant, which had the peak in summer. In those bands, there were negative correlations between the solar zenith angles and the Minnaert constants. On the other hand, the band 3 indicated unclear variations in the Minnaert constants rather slight fluctuations. Then there was not significant correlation between the solar zenith angles and the Minnaert constants of the band 3. The results of this study suggested that visible band and near infrared one differ in the annual change pattern of the Minnaert constant.
