| dc.description.abstract | Cyber city modeling is an important work in the city planning, construction, and management. Three dimensional building models are the indispensable component in the cyber city.
Selecting the approach of data fusion, this investigation combines LIDAR point clouds and aerial images to reconstruct building models. Considering the variety of buildings, the reconstruction includes buildings with line and arc outlines. By the integration of geometric and radiometric information first, the building regions are extracted followed by the method of elevation slicing to obtain initial building outlines and step edges. Through the back projection of the outlines to the image space, the arcs and straight lines are obtained. Then the arcs and the straight lines are projected to the object space. Employing roof analysis, we determine the three dimensional edges and building outlines. Finally, the SMS method is applied to generate the building models.
The test site is in the Industrial Technology Research Institute of Hsinchu. The spatial resolution of aerial image is 50 cm, and the point density of LIDAR data is 2.15(point/m2). The success rate of building detection is 91%. Among the successfully detected buildings, 90% are fully or partially reconstructed. The RMSE of building boundaries are 0.73 m and 0.71 m in X and Y directions, respectively. The shaping error is 0.12 m. | en_US |