[GRASS-user] Semi-automatic classification with GRASS modules

[Nikos Alexandris]

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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