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Erschienen in:
2011 | OriginalPaper | Buchkapitel
Model Generalization of the Hydrography Network in the CARGEN Project
verfasst von : Savino Sandro, Rumor Massimo, Canton Fabio, Langiù Giovanni, Reineri Marco
Erschienen in: Advances in Cartography and GIScience. Volume 1
Verlag: Springer Berlin Heidelberg
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This paper will present a complete process for the generalization of a hydrography network. The process was developed in the Italian CARGEN project, that aims at the generalization of geodatabase data from 1:5000 to 1:25000 scale. The model generalization process relies on the data enrichment of the input model that allowed to re-classify the data according to the output model and to drive the selection assessing the importance of each river. The information gathered is the river width, the Strahler order, the flow direction, the longest path to the furthermost source, the length, the number of branches uphill and the density. The paper will describe how the width of each river was measured, how the classification of the rivers was harmonized, how the flow direction was calculated from the z coordinates, the reconstruction of the river courses and the algorithm for the selection of the rivers both on length and density thresholds.