Thanks you for the answers! The aerial photos classification is a common problem. In particular when there is a need to classify small elements. I have alway done a manual classification but now I need to eleborate many photos to distinguish the forest from the agricultural areas. So, I will try with different modules and, if doesn't work, I will use GRASS direclty.
2018-07-05 8:17 GMT+02:00 Nikos Alexandris <[email protected]>: > Michele Zurlo: > > [..] > > I use this e-mail also to make a question, during a work I tried to >> classify a pancromatic aerial image using an unsupervised approach. >> Running i.cluster it gave me an error indicating that it needs more >> than two classes. What I missed? >> > > Dear Michele, the algorithm behind i.cluster does not work with less > than two input images. See also: > https://trac.osgeo.org/grass/ticket/1908. > > Kind of a common practice, is to use another input derived from the first. > I.e., some synthetic image, derived from the aerial panchromatic one. > See https://grass.osgeo.org/grass74/manuals/r.texture.html. > > Nikos >
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