Hi Jordi,
Thank you for your answer and the wiki link! I read carefully the wiki section, and this is all fine, but I do not know how to interpret the output image of the “otbcli_DimensionalityReduction”. Is the output image the pca-transformed input image? If yes, why is the standard deviation of each band in the output image equal to 1? You also mentioned the following “You can use the eigenvalues … They are stored in a file which has the same name as the model but with a .txt extension. ”. Maybe I am missing something here, but in “otbcli_DimensionalityReduction” there is no “model” parameter. The only txt file I can get is a 9x9 matrix resulting from the option “-outmatrix”. However, in the otb help, it is explained shortly that this is a “transformation matrix”. Does the “-outmatrix” option provide a matrix with the eigenvectors? Thank you for your time and help! Cheers, Kimi On Monday, 3 September 2018 11:46:43 UTC+2, jordi.inglada wrote: > > Hi Kimi, > > The components are given as directions (eigenvectors) and are therefore > normalized (unit vectors). You can use the eigenvalues (the variance of > each direction) to select the components[1]. They are stored in a file > which has the same name as the model but with a .txt extension. > > Best wishes, > > Jordi > > [1] https://en.wikipedia.org/wiki/Principal_component_analysis#Intuition > -- -- 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.
