ESTIMATION OF SOIL CONDITION BASED ONTHE 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 tornnatural disasters. However, to collect information on the ground condition over a wide area isrnnot an easy task. In order to solve this issue, the authors have looked at the fact that therncondition of the ground is closely related to the landform. This paper aims to establish arnmethod for obtaining landform classification in a wide area based on land use and its change.rnA fundamental method has already been proposed in the previous study in which Chiba city andrnits surrounding area were considered and it was pointed out that land use of old times andrnsatellite (Landsat/TM) data are effective to this classification. In this study, this method ofrnclassification has been extended such that a new target area was selected and a new method ofrnimage classification was applied. This image classification is based on image objects ratherrnthan individual pixels. Image objects have a various attributes in addition to spectral intensityrnof pixels. In addition, Digital Elevation Model(DEM) was used in order to distinguish betweenrntable land and local relief. DEM is constructed as 50 meter mesh data, and is publishedrnthroughout the country in Japan. From this study, it was found that the proposed method isrnapplicable to areas other than Chiba and that image objects are effective for classification.