[GRASS-user] Supervised classification without i.class

[Martin Landa]

Hi,

2009/12/3 Luis Lisboa <luislisboa1975 at gmail.com>:

> I saw a few messages talking about i.class not being available to
> WindowsGRASS.
> Next January I will give a few classes of Remote Sensing in the University
> and I was planning to use GRASS6.4 in the classes. One of the major modules
> is Supervised Classification. Those classes will be taught using Windows OS.
> According to GRASS book (I bought it :) ), I can perform supervised
> radiometric classification using digitized training areas (i.class) (I) or
> using auxiliary data (II).
> About (I) I realized that i.class options are not available in Windows.
> Besides i.class is there any alternative to have an interactive selection of
> training areas?

I am afraid not -- only non-interactive approach. Digitize areas,
rasterize vector areas and use i.gensig.

> About (II). Is it possible to use a ESRI shapefile with all areas as an
> input and then converted to shapefile?

Import data to native format using v.out.ogr or link data using
v.external (some problems can occur). The OGR interface is being
improved in GRASS 7.

> Another question/request is if there is any manual/tutorial explaining classification procedure in GRASS6.4?

I am using GRASS for remote sensing course at my university (only in
Czech) [1], classification [2, 3].

Martin

[1] http://gama.fsv.cvut.cz/wiki/index.php/153YZOD_Zpracování_obrazových_dat#Cvi.C4.8Den.C3.AD
[2] http://gama.fsv.cvut.cz/wiki/index.php/153YZOD_Zpracování_obrazových_dat_-_cvičení_10
[3] http://gama.fsv.cvut.cz/wiki/index.php/153YZOD_Zpracování_obrazových_dat_-_cvičení_11

-- 
Martin Landa <landa.martin gmail.com> * http://gama.fsv.cvut.cz/~landa