I want to classify my geometry training data, so I am trying out the supervised classification with random forest. But the result show that all of the area have been classified. I mean, could I just classify my geometry training data not all of the area?
You can mask out the rest of the image using the geometries, they are stored as masks automatically using the MaskManager. Still the whole image will be classify, but you use the mask later to hide the non-valid pixels.