Hierarchical GML Modeling of Transportation Networks Knut-Erik Johnsen Veileder: Gunnar Misund.

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Presentation transcript:

Hierarchical GML Modeling of Transportation Networks Knut-Erik Johnsen Veileder: Gunnar Misund

Project description There are vast amounts of geodata available. This project will try to find a smart way to organize and store this data with two goals in mind, visualization and analysis. The main case will be transportation networks. Different algorithms for transportation planning and shortest path will be investigated. All results and publications are part of the OneMap project.

TigerLine Data US Highways, resolution ca. 11 km

Grid Approximation Overlay the grid representing your wanted level detail (resolution) Snap points to nearest grid point Discard redundant points

Network Generalization Selection/deletion Clustering Stroke ordering (Thomson)

Road Class Grouping Most road data incorporates some kind of classification US Census Tiger Line Files: CFCC codes + A4 (purple, "Local, Neighborhood, and Rural Road"), A6 (brown, "Road with Special Characteristics") and A7 (cyan, "Road as Other Thoroughfare"). A1 (red) and A2 (blue) A1: "Primary Highway With Limited Access" A2: "Primary Road Without Limited Access". + Class A3 (green): "Secondary and Connecting Road".

Strokes are constructed by joining consequtive segments with same road name Larger than 10.5 km 657 to 1314 meter 164 to 328 meter Stroke Extent Grouping