milou <[email protected]> wrote: > > hello, > > thank you, yes i actually I work with this payper, but I dont understand why > Typical value of alpha is 1.0 , The amplitude thresholdn is 5 · 10−5. The > tolerance threshold is 1.0, threshold parameter. A typical value is 25? how > this > parameters are chosen?
Unfortunately, we don't have a theoretical demonstration for the optimal values, but if hope that with an indication of typical values and an understanding of their influence on the results, you can tune them for your needs. > > 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. > > -- > -- > Check the OTB FAQ at > http://www.orfeo-toolbox.org/FAQ.html > > You received this message because you are subscribed to the Google > Groups "otb-users" group. > To post to this group, send email to > otb-users-/[email protected] > To unsubscribe from this group, send email to > otb-users+unsubscribe-/[email protected] > For more options, visit this group at > http://groups.google.com/group/otb-users?hl=en > --- > You received this message because you are subscribed to the Google Groups > "otb-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to > otb-users+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/[email protected] > For more options, visit https://groups.google.com/groups/opt_out. -- -- Check the OTB FAQ at http://www.orfeo-toolbox.org/FAQ.html You received this message because you are subscribed to the Google Groups "otb-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/otb-users?hl=en --- You received this message because you are subscribed to the Google Groups "otb-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
