Abstract
In the lowlands under 10 meters in altitude, the northwestern part of Saga plain, we discussed that landforms and landuse changes by using topographic maps, and that relationship between creeks and surface ground by using geologic data. This study reveals that the distribution area of creeks overlaps with the greater part of the soft ground area. Creek is the important geomorphic element that can be estimated the condition of surface ground. Estimating the geology of surface ground by using landform data is an effective estimation method on the ground in the initial road planning at the lowland. The landform data is useful for us not only to reduce the cost for construction but also to use the material on communication in PI (Public Involvement).
