[GRASS-user] Long post - Remote Sensing - Classifications

[mitch]

On Thu, 2009-02-26 at 14:25 +0100, Moritz Lennert wrote:
> On 26/02/09 13:58, mitch_TX wrote:
> > On Wed, 2009-02-25 at 20:46 -0800, Hamish wrote:
> >> ok so from the command line 'd.mon x0' should work to open a monitor,
> >> and you could try the steps first from the command line (keep it simple).
> >> If all works there you can move to trying launching it from a GUI.
> >> i.class will always want to run in an xmon + console though.
> >>
> >> this gets i.class working for me using the sample Spearfish imagery
> >> dataset:
> >>
> >> g.region rast=spot.comp
> >> d.mon x0
> >>
> > 
> > When I do that, I get the following warning using the wxPython GUI.
> > http://n2.nabble.com/file/n2389455/dx0.png dx0.png 
> > 
> 
> 
> Hamish meant running these modules from the command line.
> 
> > That's the point. Isn't supposed to be a monitor display?
> > "..divided into three parts. In the upper right corner you see the image. In
> > the lower right corner, zoomed map portions will be displayed when using the
> > zoom function. In the left section of the monitor, histograms for the
> > selected training areas for all channels will be displayed. The training
> > areas can be digitized...." 
> > (Neteler, M., H. Mitasova 2008, pp. 320-321)
> 
> Again, this is when run from the command line using the x-monitors (i.e. 
> d.mon).
> 

The funny thing is that I thought I did all of the above (from
CL)...I'll try again.


> > No. They are general simple windows displaying info regarding coordinates
> > and Digital Number values like:
> > 
> > Diplay: #
> > R:# G:# B:#
> > Proj: UTM ZONE
> > Map: #, # meters
> > Lat Long: DD, DD
> > 
> > Moving the cursor on 2 linked displays you have the same geo-info
> > (you are supposed to link 2 linkable displays) but different RGB values
> > (generally 2 -- or more -- different bands or color composition are loaded
> > on different displays).
> > The meaning of this is allowing a visual inspection (in terms of either
> > different color composition or shades of gray) of the same area, supported
> > by a numerical info (DN -- therefore a precise representation of the
> > reflectance behavior of different surfaces).
> > I don't know if I made myself clear..I can show you a couple of screen-shots
> > as soon as I get to the department (it's going to be Envi and Erdas
> > though...I hope you guys don't mind "commercial" images on this forum :-))
> 
> In the wxGUI, if you display the two raster in the same Map Display, 
> select both of them in the layer manager and use the query tool in the 
> Display, you get the numerical information on both maps. But you have to 
> open another Map Display if you want to _see_ both maps.
> 
> 
> >> or even a static d.what.rast?
> >>
> >> I am not sure what you mean by that.
> >> maybe r.what does what you want?
> >>
> > 
> > 
> > In order to use r.what you are supposed to use a separate file containing
> > the points you are querying, right?
> > No, this is not exactly what I'm talking about...or better, the outcome is
> > but it's not the interaction that I'm looking for. I'm talking about a
> > pointer based like d.what.rast one.
> 
> You have the query tool in the Map Display of the GUI.
> 
> Moritz


I'll try this too..I gotta go now though.

cheers,
mitch