Abstract
It is important to efficiently create 3D models of target facilities in order to apply CIM which is promoted by the Ministry of Land, Infrastructure, Transport and Tourism to maintain river related facilities. The 3D model of a river related facility which was created at its construction stage is supposed to have an adequate accuracy for the maintenance. However, it is considered to be unrealistic to let 3D models of existing river facilities have the same Level of Development (LOD) as on the construction stage, because it will cost significantly. There have been no insights related to LOD for 3D models in the area of civil engineering so far. Thus, this paper focuses on LOD for 3D models used for maintaining river related facilities, and considers which level of elaborated 3D models should be created so that they can be practically applied without any excess or deficiency for maintaining river related facilities.
