[GRASS-dev] About signature files.

[Markus Neteler]

Juan Diego Giraldo Osorio wrote on 09/10/2007 05:17 PM:
> Hi coworkers
>
> I'm working with grass62. Now I'm trying to develop a code to classify
> MODIS images. I have been using i.cluster, but this code perform an
> unsupervised classification (in conjunction with i.maxlik). I have three
> categories built with v.digit, then I need the signature file for this
> training pixels like input to i.maxlik. Someone have developed an
> "i.signature" code, with a categorized map like input, and the signature
> file like output?
>   
It is there: i.gensig. Here the overview:

Classification methods in GRASS (table best seen with courier font):

              |radiometric,|      radiometric, supervised    | radio-
and geo-
              |unsupervised|                                 |metric,
supervised
--------------+------------+---------------------------------+------------------
Preprocessing |  i.cluster |i.class (monitor) i.gensig
(maps)|i.gensigset (maps)
--------------+------------+---------------------------------+------------------
Computation   |  i.maxlik  |     i.maxlik          i.maxlik  |      i.smap

Hope this helps,
Markus


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ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler
ITC -> since 1 March 2007 Fondazione Bruno Kessler
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