EuroSDR Projects - Host Ireland

5. How is the smoothness of road trajectories modeled?
Not at all [2]
Splines (a) [2]
Snakes (b) [2]
Kalman-filter (c) [1]
otherwise (d) [7]
If a) - d), please specify:
piecewise parabola; evaluation by fuzzy values based on length, straightness, constancy width,
constancy gray value; robust polynomial adjustment; weighting of lines according to smoothness and
collinearity during grouping; zip-lock ribbon snake, Bezier curve; smoothness via weighting by mean
curvature; piecewise linear
6. How is the network character of roads modeled?
Not at all [1]
Local gaps are bridged. (a) [6]
Global optimization of the network (b) [5]
otherwise (c) [4]
If a) - c), please describe your modeling in more detail:
decision for grouping based on gap length and direction difference; graph data structure; global path
search incl. analysis of path lengths; based on grouping criteria and local context – network enforced
by simple crossing extraction; generation and weighting of connection hypotheses is based on local
criteria (length, collinearity) – graph constructed from road segments and connection hypotheses –
promising hypotheses from globally optimum paths – verification by checking homogeneity, shadow,
or cars; network broken down in components on different levels, e.g. pairs of edges, junctions –
compositional: add up to full network
7. What attributes are determined?
Road class [4]
Road width [9]
Number of lanes [3]
Width of lanes [2]
Road markings [2]
Surface material [2]
Other (please list) [1]
height profile and intern quality measure
8. What types of crossings are modeled (in which way)?
Simple crossings (3-4 road segments meeting at the intersection) [8]
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