Geological Zoning of Tideland Sediments by a Combination of Sample Reflectance and Satellite Remote Sensing

摘要

For detecting spatio-temporal changes of tideland environments in a closed sea by remote sensing technique, geological zoning is proposed based on the surface reflectance spectra from visible to short wave infrared wavelength. The spectra are characterized by sample measurements and satellite image data analyses. The measurements clarify that the spectra patterns, which are the increase degree of reflectance with wavelength and the existence of reflectance absorption, are attributable to die mineral composition and that the magnitudes of reflectance are determined by particle size of the sediments. In general, the spectra are classified into two types which are mainly located around two river mouths. We present effectiveness of two-band ratio processing and color composite using ASTER image data for the geological zoning. The zoning is also investigated by a kriging method using the semivariogram of the average reflectance of image data and the category data depending on the spectral pattern at the sample locations. The kriging map can contribute to interpret the extent of sediments bearing similar particle size and main constituent minerals.