Application of REAL TIME GIS using remote sensing and RTK-GPS for local government

Much local government has been using a large scale digital map with Geographic Information System (GIS). However, the updating method of a map is not established yet, and there are very few successful examples. The purpose of this study is the application of REAL TIME GIS using remote sensing and RTK-GPS for local government. REAL TIME GIS is the system for real-time mapping and updating at the field site using Real-time Kinematic Global Positioning System (RTK-GPS), GIS and cellular phone. This system has the problem that RTK-GPS positioning data is Japanese Geodetic Datum 2000 (JGD2000) of WGS-84, but most of the digital maps of local government are still Tokyo Datum of old geodetic system. It is necessary to transform an old geodetic system to a new one. We used Affine Transformation for this problem. In this paper, the parameters which were calculated by Affine Transformation were named "High-Accuracy Regional Parameter (HARP)". As a result, Affine Transformation has 2 cm errors using 4 control points at the corner of unit. In conclusion, the need of HARP with Affine Transformation was indicated. It is suggested that the process of REAL TIME GIS and HARP should be introduced to the work of local government