Analysis of detailed geographical features using shadow of satellite images in the case of illegal dumping site on the border between Aomori and Iwate prefectures

Abstract

Recently, the analysis of geographical features by digital elevation models (DEM) which are made from satellite images, has become a widely researched topic. However, espacially in the case of old satellite image, DEM or the stereo pair to make it might be hard-to-find. Then we developed the estimation method for three-dimensional detailed geographical features shape using shadow of satellite images. In this study, we investigated the influence on the result of estimation by choosing the boundary of a shadow. Also, we examined the threshold of the brightness to discern the shadows of geographical features from old satellite images.