Urban and regional data management: UDMS Annual 2007 ; by Volker Coors; M Rumor; Elfriede M Fendel; Siyka Zlatanova;

By Volker Coors; M Rumor; Elfriede M Fendel; Siyka Zlatanova; et al

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Additional info for Urban and regional data management: UDMS Annual 2007 ; Proceedings of the Urban Data Management Society Symposium 2007, Stuttgart, Germany, 10-12 October 2007

Sample text

Zeytinburnu has a mixed structure of large scale industry, small enterprises and different types of residential areas. A first overview of Zeytinburnu is provided by an IKONOS image from the year 2004, shown in figure 1. IKONOS features four spectral bands (blue, green, red, nir) and a spatial resolution of 1 m for the panchromatic band, 4 m multi-spectral, and 1 m pan-sharpened. It shows the diverse heterogeneous structure of the district and the local differences in urban morphology. With reference to population, two different data sources are available.

Approximating polygon obtained by the RANSAC-method. randomly – not reproducible! For different initialisations of the random number generator even the number of segments may vary. An improper choice of the parameters may distort the symmetries of a ground plan. The rule-based algorithm which is used to combine the segments to a polygon is crucial and affects the result to a certain amount. However, certain arbitrariness seems to be inherent in the problem, which becomes already evident from the unsharp requirements stated in section 2.

To form a closed polygon. Representatives of the first class are: 1. Iterative Construction of Minimum Bounding Rectangles (MBR) – hierarchical fitting of rectangular polygons (Wikipedia, 2007). This method is explained in detail in section 4. 2. Douglas-Peucker algorithm (Douglas & Peucker, 1973), (Duda & Hart, 1973): The algorithm starts with the first and last point A and B. A straight line is constructed through these points. The original point Q having the largest distance to the straight line is searched in order to replace the original straight line by the two line segments AQ and QB.

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