[GRASS-user] Long post - Remote Sensing - Classifications
hamish_b at yahoo.com
Thu Feb 26 22:25:11 EST 2009
> > 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.
run that from the terminal prompt, not from the wx GUI.
> > I'm not sure what good results are supposed to look like.
> That's the point. Isn't supposed to be a monitor display?
i.class should bring up an interactive workspace in the Xmon with control
buttons in along the bottom etc.
resulting sig file (in $MAPSET/group/$GRP_NAME/subgroup/$SGRP_NAME/sig/
when I exit the program it just says:
not sure if there should be more there. (prob have to read the imagery
> > > is there any way in GRASS to link different map displays
> > I am not sure what you mean by that. zoom in one moves both?
not that I know of (in the wx gui; search archives for d.frame and d.mon 'd.zoom -p' + d.redraw automation attempts)
in the wx gui you could update with set/set from computation region &
redraw but it is a number of mouse clicks.
> > > and have a "brushing" (update while dragging)
> 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
ah, try the pull-down menu on the bottom of the wx map display window
or d.text for screenshots.
> 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
in the xmons you can 'd.rast -o' overlay the band rasters and then
d.what.rast gives you the values of all at that point.
> > 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?
or just type them in
> 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.
.... but from the wx GUI
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