thank you so much. regards. Le mercredi 12 février 2014 19:23:54 UTC+1, milou a écrit : > > Hello, > please I need to understand how to chose the different parameters > (alpha, amplitude threshold, tolerance threshold, distance threshold) for > road extraction; > > "We must also set the alpha parameter of the filter which allows us to > tune the width of the roads we > want to extract. Typical value is 1.0 and should be working in most > situations. > > The amplitude threshold parameter tunes the sensitivity of the > vectorization step. A typical value is > 5 · 10−5. > > > The tolerance threshold tunes the sensitivity of the path simplification > step. Typical value is 1.0. > > The otb::RoadExtractionFilter is able to link path whose ends are near > according to an euclidean > distance criterion. The threshold for this distance to link a path is the > distance threshold > parameter. A typical value is 25." > > thank you very much. >
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