Cadastral surveys have been carried out in Turkey using different methods such as graphical, photogrammetrical, orthogonal, tachometric and digital techniques. National cadastral works require large scale maps with sufficient position and elevation accuracy, especially when they are used for projecting technical services in metropolitan areas. The applications of this project include using cadastral data as a basis to inform building decisions in these areas. Maps can be produced with various techniques, but there are some that can provide information that is time saving, offering user efficiency through computer-based technologies. One such technique is the rapidly evolving science of photogrammetry. Photogrammetric techniques provide digital maps that are easy to produce and use. In this study, 1:5,000 scale photogrammetric maps produced by the General Directorate of Land Registry and Cadastre (GDLRC) and the Photogrammetry and Geodesy Department Presidentship were collected for the Taskopru Township in Kastamonu County, Turkey. The ownership cadastres for this town were delineated by the GDLRC using digital photogrammetric techniques. This data format was analysed to determine if it is useable with cadastral mapping and information systems. A series of 1:5,000 scale photogrammetric maps belonging to the flat and hilly areas were evaluated. At densely populated places in the centre of the town, the cross points of parcel coordinates were measured and calculated with classical techniques. In less densely populated areas, such as empty fields, the cross points of parcel coordinates were measured and calculated with Global Positioning Systems (GPS). Control measurements for each map, measurement data and map data (parcel cross coordinates and parcel surveys) were crosschecked for flat and hilly area. The accuracy of the 1:5,000 scale photogrammetric maps was then assessed statistically. Finally, the photogrammetric maps were determined as either useable or unusable for the production cadastral maps in this region.
Key words: Turkish cadastre, photogrammetric map, cadastral map, information system.
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