ESTIMATION OF SOIL CONDITION BASED ON THE CHANGE OF LAND USE AND DIGITAL ELEVATION MODEL

摘要

The knowledge about the condition of the ground is a crucial factor that controls damage due to natural disasters. However, to collect information on the ground condition over a wide area is not an easy task. In order to solve this issue, the authors have looked at the fact that the condition of the ground is closely related to the landform. This paper aims to establish a method for obtaining landform classification in a wide area based on land use and its change. A fundamental method has already been proposed in the previous study in which Chiba city and its surrounding area were considered and it was pointed out that land use of old times and satellite (Landsat/TM) data are effective to this classification. In this study, this method of classification has been extended such that a new target area was selected and a new method of image classification was applied. This image classification is based on image objects rather than individual pixels. Image objects have a various attributes in addition to spectral intensity of pixels. In addition, Digital Elevation Model(DEM) was used in order to distinguish between table land and local relief. DEM is constructed as 50 meter mesh data, and is published throughout the country in Japan. From this study, it was found that the proposed method is applicable to areas other than Chiba and that image objects are effective for classification.