Abstract
This paper has focused on Land-use change to clarify spatial distribution of human impacts on terrain as a viewpoint of vulnerability mapping to natural disasters. First, the technique of making 100m-mesh land-use maps, which divides into farm lands, forest, urban, river, sea shore and sea, has been developed using the old editions' 1/50,000 topological maps of Geospatial Information Authority of Japan. Then, the land-use change from 1900 to 1997 in the Fukuoka Prefecture area has been analyzed using the geographical information systems (GIS) in comparison with distribution of regional geology and terrain.
The results are as follows. (1) The relationship between land use and terrain changed significantly after 1950 in comparison with land use of 1900 that harmonized with local relief. (2) The lands of plutonic rocks had already been developed widely before 1900, and its use shifted to urban use from farm land after 1950. (3) The characteristics of elevation and slope angle in urban and farm lands indicate that the urban lands which adjoin mountainous area increased by about ten times from 1900 to 1997. (4) The difference of 4 to 8 degrees in slope angle has been estimated on plutonic rocks' terrain that changed from forest as human impacts, based on the relationship between land use and its geology.
These results imply that the proposed method would enable mapping of anthropogenic terrain.
