I forgot to say that after the segmentation, I added a field in my vector attribute table named "training", and I gave some numeric values to few polygons based on the classes I want the segments to be classified in (3 classes)
So now I'm with a few polygons having a training value, and most of the polygon having no training value, and I want to do the svm classification from this. Le lundi 2 janvier 2017 23:52:47 UTC+1, Geoffrey Balme a écrit : > > Hi Guillaume, > > I'm also trying to do supervised object-based classification. > What I did so far is a meanshift segmentation on my satellite raster image. > Then I did TrainImagesClassifier (svm) on the vector results of the > segmentation. > And at this point I'm not sure anymore what to do as there was no output > on the previous step. > Could you guide me from the segmentation to have an object-based > classification using SVM ? > > (I tried to do OGRLayerClassification, but had no idea of what to put in > the xml inputs etc..., the only input I have are my raster and my > segmentation vector result) > > Thank you ! > > Le jeudi 24 novembre 2016 14:46:00 UTC+1, Guillaume Pasero a écrit : >> >> Hi Patricia, >> >> If I understand right, you want to perform object-based classification. >> >> In OTB-5.6.1 there is the application TrainVectorClassifier to train a >> classifier based on input geometries. You have to set several fields in the >> geometries you want to use for training : >> >> - one field to indicate the class of the geometry >> >> - several numeric fields to store the features attached to geometries. >> >> The fields can be extracted from a raster with LSMSVectorization and >> modified with QGis. >> >> After the training, you can either apply the model on the full set of >> geometries (with OGRLayerClassifier), or try to apply it on a raster (with >> ImageClassifier, but more difficult). >> >> Regards, >> >> Guillaume >> On 11/24/2016 02:09 PM, Patricia Lourenco wrote: >> >> Dear all, >> I am new with OTB-Monteverdi 5-6-1. >> >> I want to classify an image based on the segments created in the >> LSMVSVectorization (step 4 of the segmentation)using OTB/Monteverdi >> versions 5.6.1. >> However, I am not being able to do it. >> >> My questions are: >> >> 1. Which are the steps that I should take to do a classification based on >> segmentation? >> >> 2. Which OTB-Application should I use to select the segments for my >> classes? >> >> Thank you, in advance, for your help. >> >> Sincerely, >> Patricia >> -- >> -- >> 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-...@googlegroups.com >> To unsubscribe from this group, send email to >> otb-users+...@googlegroups.com >> 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+...@googlegroups.com. >> For more options, visit https://groups.google.com/d/optout. >> >> >> -- >> <http://www.c-s.fr> *Guillaume PASERO* >> Responsable technique >> *Business Unit E-SPACE & Geo Information - Département Image & >> Applications* >> >> *CS Systèmes d'Information* >> Parc de la Grande Plaine - 5, Rue Brindejonc des Moulinais - BP 15872 >> 31506 Toulouse Cedex 05 - FRANCE >> +33 561 17 64 21 - guillaum...@c-s.fr >> > -- -- 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@googlegroups.com To unsubscribe from this group, send email to otb-users+unsubscr...@googlegroups.com 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+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
