Hi Cedric, see my answers below
2017-06-23 16:47 GMT+02:00 celati Laurent <[email protected]>: > Good afternoon, > > i'm working with OTB 6 on windows. > > I generated several OTB texture indices. Now, i want to evaluate the > information 's redundancy thanks to a Principal Component Analysis. > > > => Is it possible to do that with OTB? The tool called "dimensionality > reduction" would be interesting fot this step? > I think so, theoretically it does make sense to apply PCA to reduce the number of texture features > Moreover, I would like set a mask AND set a spectral subset (in order to > ignore some indices bands which seems no relevant to introduce into the > process). > You can perhaps apply the mask before the dimensionality reduction (with the BandMath for instance). To ignore some indices you can use a nice feature added in last otb version which allows to select a subset of bands from the input image. For instance to select bands 1 and 2 put as input filename: image.tif?&bands=1,2 You can also select range of bands with the syntax ′2 : 4′ means bands 2,3 and 4 It is part of the extended filename mechanism, see the documentation in the software guide: https://www.orfeo-toolbox.org/SoftwareGuide/SoftwareGuidech6.html#x27-910006.10.3 > > Could you throw light for me? > > In advance, thank you very much for your help. > > Kind regards. > > -- > -- > 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. > -- 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 [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.
