REAL TIME GIS by collaboration of remote sensing, GPS and GIS

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, and there are very few successful examples. The purpose of this study is the real-time renewal of the digital map for local government by using Remote Sensing and Real-time Kinematic Global Positioning System (RTK-GPS). First, change of the city is easily found by overlay Remote Sensing imageries and digital map with GIS. Next, Position of changed area was measured by RTK-GPS. REAL TIME GIS is the system for real-time mapping and updating at the field site using RTK-GPS, GIS and cellular phone. But, RTK-GPS measuring 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 order to solve this problem, the parameters were calculated using Affine Transformation. In this paper, these parameters were named "High-Accuracy Regional Parameter (HARP)". As a result, it was differences less than 3cm in any case. 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.