Pictometry : potentials for land administration
Lemmens, Mathias, Christiaan Lemmen and Martin Wubbe
The Netherlands' Cadastre, Land Registry and Mapping Agency (Kadaster) performed a research to the potentials of the Pictometry technology for cadastral purposes in close cooperation with the GeoTexs company from Delft, The Netherlands and Blom Info, Copenhagen, Denmark, part of the Blom Group. Blom Group has an exclusive license to apply Pictometry technology in Europe. Data capturing with this technology will be executed for all 50.000+ inhabitants cities in Europe. The patented technology allows users to easily and efficiently view and measure in ortho images and oblique images and enables creation of a much richer database of the real world while the images can be processed in existing GIS environments. In the research Pictometry images were used captured in 2006 and covering the entire territory of Apeldoorn municipality, The Netherlands. The map data consists of: (1) boundary lines of objects of Top10Vector and Top25 Raster, (2) feature lines of the Large Scale Base Map of the Netherlands (GBKN) and (3) cadastral map. Our tests reveal that the accuracy of taking location measurements in ortho-images is 19cm and in ortho-images 86cm, expressed in terms of root mean square error. The accuracy of the elevation component depends on the accuracy of the underlying DEM. Although Pictometry technology has been announced as a visualisation tool, not as a surveying tool, the above measures demonstrate that photogrammetric surveying accuracy can be achieved. Within a cadastral context Pictometry may serve as aid in splitting parcels and carry out parcel formation. Furthermore, it appears to be a suitable tool for (1) preliminary boundary determination via notary, (2) building registration and (3) communication from government to citizen.
Event: 6th FIG Regional Conference 2007 : Strategic Integration of Surveying Services
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