[GRASS-dev] wxGUI: supervised classification tool

[stepan.turek]

Hi,




yesterday I discussed some ideas on improvement of supervised classification
capabilities in GRASS with Martin and a remote sensing researcher, who is 
working with proprietary software. 




We came up with suggestion that useful feature for GRASS would be 
interactive scatter plot tool which would allow to highlight pixels 
according to chosen areas in scatter plot and also in reverse way it would 
allow to highlight corresponding points in scatter plot for chosen areas in 
map window. 

Also it would plot class ellipses for training areas.




Useful and unique feature among GIS and Imaginary software would be scatter 
plot 3D mode which would allow comparison of 3 bands.

 

Stepan 


---------- Původní zpráva ----------
Od: Anna Kratochvílová <kratochanna at gmail.com>
Datum: 20. 12. 2012
Předmět: Re: [GRASS-dev] wxGUI: supervised classification tool

"Hi,

On Thu, Dec 20, 2012 at 9:52 AM, Markus Neteler <neteler at osgeo.org> wrote:
> Hi,
>
> while searching for the new i.class tool I have discovered
> the "supervised classification tool"
> in Imagery -> Classify Image -> Interactive input for supervised 
classification
>
> Nice! /edit: I now see that it *is* the
> http://grasswiki.osgeo.org/wiki/WxIClass
(http://grasswiki.osgeo.org/wiki/WxIClass)
>
Right, wxIClass (perhaps g.gui.iclass(http://g.gui.iclass) in the future), 
available as
"Interactive input for supervised classification" from the menu, is
intended to be an i.class replacement.

> I tried it with NC data and loaded the Landsat2002 group.
> Now I would expect that I can select channels for display from
> the group. Perhaps something with [x] checkboxes would be
> good. The existing "free" choice of maps should remain of course.

That's reasonable, other suggestions are here:
http://trac.osgeo.org/grass/wiki/wxGUIDevelopment/wxIClass
(http://trac.osgeo.org/grass/wiki/wxGUIDevelopment/wxIClass)

>
> When I then digitize, it nicely opens the class dialog, ok. Then,
> when running, it segfaults (entire wxGUI disappears, no error msg
> visible).

There have been some changes three days ago which should fix this
crash. If you used the latest version, we have a problem.

>
> Suggestion: It may also become the tool for i.smap, just a method
> dialog would be needed
>
>> Run Analysis
> - MaxLik: i.maxlik
> - SMAP: i.gensigset, i.smap
>

yes, something like this is planned, Stepan is collecting these ideas now.

We haven't touched this tool for some time, however Martin tried to
use it in class with students this week and he promised to report
bugs.

Anna and Vaclav

> to make it universal. However, great to have such a tool now.
>
> Markus
> _______________________________________________
> grass-dev mailing list
> grass-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-dev
(http://lists.osgeo.org/mailman/listinfo/grass-dev)"
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