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How can I get the training data from a Landsat Image?

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Agustin
Agustin 2016-4-7
I need to do classification using the knnclassify command but I am confused with creating the training matrix. I have the following information.
nchannels=12; nx=949; ny=220; Data = lanread('flc1.lan',nchannels,nx,ny);
This creates a matrix of 949x220x12 matrix. How can I create a training matrix to use knnclassify. I must do this without any clustering. Looking forward for a reply.

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