Dear Thayse , In the CookBook link I sent you they claim that if you set *Training and validation sample* ratio то 0 all will be for training and if I'm right the in log window you should have conf. matrix ONLY for training samples. See the line below
*Training and validation sample ratio: Ratio between training and validation samples (0.0 = all training, 1.0 = all validation) (default = 0.5).* Regards. Hristo BTW What is the train method you use? On Tuesday, 15 September 2015 03:33:31 UTC+3, Thayse Nery wrote: > > Hi Hristo, > > Thank you very much for your reply. > > I use also OTB as part of QGIS and as far as I know, the output files > generated by training/validation procedure are with confusion matrix but > the confusion matrix is regarding only the validation dataset. You can see > that based on the number of pixels generated for validation and training > set. If you select the ration 0.5 for training/validation set than you > might can use this confusion matrix. The .txt file generated for the late > classification with TrainImagesClassifier does not have a confusion matrix > for the training set. > > Many thanks > > On 11 September 2015 at 20:09, Hristo Nikolov <[email protected] > <javascript:>> wrote: > >> Dear Thayse , >> >> Could you please describe the way you use OTB? >> My experience with OTB is as part of QGIS. >> I could say that the output files generated by >> training procedure are with confusion matrix and >> the model file. Also in the log window of the GUI >> have the conf. matrix as well. >> >> Good luck >> Hristo >> >> >> On Thursday, 27 August 2015 09:48:25 UTC+3, Thayse Nery wrote: >>> >>> Hi all, >>> >>> I am doing an object based Land Use changes classification and I have my >>> sample training with almost 20000 pixels. I used the TrainImagesClassifier >>> and selected the ratio between training and validation samples to be 70% >>> training and 30% validation. >>> >>> As we know, this tool generates 2 files, one is the transition matrix >>> for the validation set and the other one is .txt file for the training set. >>> I would like to have a transition matrix also for my training set. But >>> since its generates only a text file, I am not able to Compute a Confusion >>> Matrix for it. I can use this text file only for the Image Classification >>> but I do not know how to access the performance for the training sample >>> based on the F-score, precision, recall and overall accuracy. >>> >>> I would like to know if it is possible to* calculate a confusion matrix >>> for this training samples*. I could have used my original shapefile to >>> do that, but since the TrainImagesClassifier uses some calculation such >>> as the maximal size of the available validation sample list per class will >>> be equal to the surface area of the smallest class multiplied by the >>> validation sample ratio, I do not know exactly which samples were selected >>> for the training and validation samples. >>> >>> Thanks for any help! >>> >>> Cheers, >>> Thayse Nery >>> >> -- >> -- >> 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] >> <javascript:> >> To unsubscribe from this group, send email to >> [email protected] <javascript:> >> 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/ITIprvSWHhc/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected] <javascript:>. >> 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.
