Research on Real-Time Revision of Base Map for Local Government using RTK-GPS

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Much local government has been using the large scale digital map with Geographic Information System (GIS).GIS will be able to work efficiently and to reduce costs of mapping. Furthermore, by sharing the data with their section in local government, it is possible to improve the service to a citizen. However, the maintenance and renewal of a map database need much labor and time. The updating method of a map is not established yet, there are very few successful examples. The purpose of this research is to establish the updating method of digital map for local government.One of the methods which can solve this problem is Real-Time Kinematic System (RTK-GPS) using Global Positioning System (GPS). It is possible that digital map data update at real time using RTK-GPS which has high accuracy and simultaneity and cellular phone. In this study, we defined the system as a REAL TIME GIS.RTK-GPS positioning data is Japanese Geodetic Datum 2000 (JGD2000) of WGS-84, but most of the digital map of local government is still Tokyo Datum of old geodetic system. In order to correspond with two kinds of data which have different geodetic system, it is necessary to transform coordinates.Geographic Survey Institute of Japan (GSI) adopted GRS80 instead of Tokyo Datum since April 2002. The data of the past survey which uses Tokyo Datum will need to be changed to JGD2000. The GSI opened a website for the conversion parameters and programs.GPS positioning data is able to apply to digital map in small scale. However, we have not been able to get sufficient accuracy of Base Map and thematic map which had been made the large scale (1/500 or 1/1000) with the old geodetic system.This research proposed the High-Accuracy Regional Parameter (HARP) which changes from old geodetic system to new geodetic system using RTK-GPS. In the research, we introduced field experiments for the process of development of HARP,and showed the results which old geodetic data was overlapped to new geodetic data.