Application of quickbird satellite imagery for updating cadastral information

The high-resolution satellite images have recently attracted much attention in photogrammetry and GIS. In this paper the main approach for updating urban cadastral information using remote sensing and GIS data are being described. Single panchromatic imagery from QuickBird, dated 27 March 2003, with 61 cm resolution in nadir is processed. The digital photogrammetric software PHOTOMOD 3.51 of RACURS Co. is used. The imagery covers about 270 km of the territory of the Capital Sofia. The DTM from existing contours in *.SHP type with contour interval 5 m is generated. After Least Square adjustment the ground displacement for normally distributed check points is as follows: mean ± 0.82 m, maximal 1.64 m. Geometrically correct orthoimagery at 1:5000 scale according to the local technical specifications is produced. For a part of the territory a comparative analysis of accuracy between obtained orthoimagery and orthomosaic from aerial photographs dated 1 May 2001, is made. The aerial photography includes 18 pictures, taken by aerial survey camera RMK A 15/23 at 1:4500 scale. The accuracy obtained on X, Y, Z-axes for the check points is ± 0.048, ± 0.057, ± 0.205 m. 3D visualization of part of Sofia, which is based on two kinds of data – CAD and GIS is presented. The building heights have been taken from the available GIS information.