Hi, the application "by default" split each polygon in 2 to select training and validation samples. There are in the application some parameters which allow to control (partialy) the way that this sample is done (training/validation samples ratio, max number of samples...)
Long story short there are now in last OTB version (5.6) new applications which allows to have a far better control on the way you're selecting pixels as samples in polygons. Look at the applications: PolygonClassStatistics (outputs statistics about the sample distribution in the input polygons), SampleExtraction (extract samples from polygons (all, regularly, randomly...) and then TrainVectorClassifier (train a classifier with as input for the learning the output from SampleExtraction). There is not yet a complete recipe in the CookBook about the sampling strategy and possible options (the reference documentation of all these applications are there however) but it should help you to create a workflow with existing OTB app which allows to control samples on which your learning the classification model. With the learning model you can then apply the classification with ImageClassifier app (same as in the pixel based image classification recipe in the cookbook). Don't hesitate if you've got any feedback. Regards, 2016-08-30 16:08 GMT+02:00 GeoFan <johw...@gmail.com>: > Hello everyone, > > I want to know if the tool "TrainImagesClassifier(libsvm)" is using an > average of the polygons or if it is using every single pixel value from the > polygon for calculation. > > > Thank you very much for the help! > > -- > -- > 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. > -- Manuel Grizonnet -- -- 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.
