Research on the production of 3D image cadastral map

Recently, Unmanned Aerial Vehicle (UAV), equipped with different high accurate remote sensing sensors acquiring various physical or geometric spatial information has many mature applications in different fields, such as environmental patrol, pollution monitoring, disaster prevention and relief, and mapping. High resolution imagery acquisition and spatial geometric information extraction is still the current major application for UAV. The visual representation of traditional cadastral maps is still limited in 2D drawings. It seems insufficient to provide intuitive understanding of the variety of problems in high density residential areas. Even though the 2D cadastral maps can be overlapped on traditional semi orthophoto, it still represents in two dimensional map. It is very hard to represent land legal boundary and physical information on imagery preciously. Because 2D cadastral maps and 3D image-based model are produced separately, it is also a very challenge issue for the land boundary line to follow the variation of terrain surface. This study propose a 3D cadastral map production and update technology using UAV-derived imagery. This study overlaps the cadastral map with true orthophoto using 3D visualization technique which change the way for visual inspection of traditional cadastral map. In this study, digitized land corner coordinates from UAV-derived true orthophoto are verified by field survey data. The accuracy of these land corner points is proved to fulfill the requirement of cadastral map accuracy.