Abstract
Urban utility companies, to be able to manage, maintain and optimize their increasingly complex facilities, have had an urgent need for computer mapping. The Tokyo GasCompany began research and development of its mapping system for the purpose of managing its gas pipeline facilities in 1977, and completed it in 1982. Based upon the experience of GIS data base construction of the large volume, This paper describes the research of the characteristics of data structure of underground utilities and proposes a new idea of data base structure for the management of underground utilities.
This paper also proposes and estimates a new update method of GIS data base and concludes that the total update time of GIS data base by the new method is one half of the existing method.
