Application of REAL TIME GIS for Local Government and Collaboration of Spatial Information

Much local government has been using large scale digital maps with geographic information system (GIS). However, the updating method of a map is not established yet. The purpose of this study is the real-time renewal of the digital map for local government by using REAR TIME GIS and spatial information. REAL TIME GIS is the system for real-time updating at the field site by using RTK-GPS, GIS and cellular phone. However, RTK-GPS data did not correspond with digital maps because of different geodetic system. It is necessary to transform digital maps of an old geodetic system to new ones. In this paper, these parameters were named "high-accuracy regional parameter (HARP)". Actual experiment was performed at two places in the narrow area at Kanazawa district in Japan. It was verified how far there are differences between base map (BM) and RTK-GPS measuring data. As a result, the difference was 5~10 cm at longitude and 30 cm at latitude. The differences at longitude are allowed in large scale digital map. Collaboration of remote sensing, GPS and GIS contributes useful tool for local government to renew large scale map.