Ok, thanks a lot for your help ! My data looks gook with this method combined with radiometric indice (GRVI in my case because i don't have nIR band)
Clovis 2015-04-08 8:19 GMT+02:00 Jordi Inglada <[email protected]>: > Clovis Didry <[email protected]> wrote: > > Hello > > > > Is there someone here who made a SOM classification to classify linear > > and unlinear woody area. I found this solutions of SOM classification, > > is it the good way to make this type of classification ? If it's the > > good method, could you explain me how can I make it on monteverdi/OTB > > with the application. > > > > Thanks a lot > > Hi, > > The Self Organizing Map (SOM) is an unsupervised classification method. > You can see it as a non-linear version of the k-means approach which is > more flexible and has also the advantage of giving a spatial representation > of the clusters (the "Map" in the name of the method). > > OTB has an application for that: otbcli_SOMClassification. > > However, there is nothing particular in the SOM method which makes it > specially a good solution for the discrimination of elongated vegetation > areas with respect to other types of vegetation. If you want to make this > distinction using unsupervised classification, you will have to find the > appropriate features that can be extracted from the images. In you case, I > would suggest the SFS (structural feature set, using the > otbcli_SFSTextureExtraction application). You can combine these features > with vegetation indices and textures and perform the classification. > > Jordi > > -- > -- > 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 a topic in the > Google Groups "otb-users" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/otb-users/HUk8Hy7THQ8/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- -- 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/d/optout.
