Abstract
The effect of rainfall on the spectral reflectance of a young plant leaf was examined. The spectral reflectance factor for the case with rainfall treatment showed a decreasing tendency in comparison with that without rainfall treatment, especially in the near-infrared region (700∼1000nm) and the short wave infrared region (1000∼2000nm). A maximum difference of the spectral reflectance factor between two cases was 10% in the near infrared region and 15% in the short wave infrared region. The method was presented to detect the vegetation vigor, using a spectral vegetation vigor index (VVI*). The spectral vegetation vigor index was found to be effective for determining the vegetation vigor.
