Real aerial laser scan data are more challenging, but the method still gives promising results. The results for simulated point cloud data are near-perfect. Finally, we intersect the segments to obtain a 2❝ model with slightly slanted walls, which should be adjusted to become exactly vertical. Next, we segment the TIN into planar segments for the ground, walls and roof planes. To generate the city model we first apply data reduction in planar areas of an initial TIN. The example shows that this method could simplify the scan line point cloud data got by 3D laser scanner directly and effectively. To be able to include vertical walls in a 2❝ model we extend the TIN data structure in such way that the height of a vertex is stored implicitly in a way that allows multiple heights and efficient processing at the same time. reconstruction of indoor models relied on 3D point clouds obtained from terrestrial laser scanning (TLS), see Fig. A simplified 3D model, like a 2❝ model with vertical walls will be easier to produce automatically, especially when the model is not produced to look nice, but just to give realistic results in an analysis or a simulation. However, creating full 3D city models from this data is a complex task. Aerial laser scan data is widely used to produce 2❝ digital elevation models automatically. The authors developed simplified receiver optical system using the line scan type laser scanner which is one of the 3D measurement methods used for laser.
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