On 18/02/09 17:17, mitch_TX wrote:
Hi community,
This semester I'm teaching an Intro Remote Sensing course using commercial
softwares. Since I'm a free spirit, my goal at the end of the semester is to
show the students that everything could be done using GRASS rather than
Envi,Erdas or Idrisi.
Given the fact that they are familiar with GUIs, I'd like to use “graphical”
commands as much as possible (I don't want to scare them)
I have a few questions:
How do I actually save a color composite image as a raster? I know how to
create it and visualize it
(GUI: Add RGB or HIS layer → I choose the bands → Display active layer on
the Map Display)
(Command: d.rgb red=lsat5_1987...@landsat green=lsat5_1987...@landsat
blue=lsat5_1987...@landsat -o)
...but I don't know how to save it, say, to use it as a base image to draw
ground truth for a supervised classification.
r.composite
(Raster->Manage map colors->Create RGB)
The other question is something that has been getting me crazy for a couple
of days: classifications.
[...]
Is this a bug or am I “the bug” :-) ??
I know that if the command line works, you all may not “see what the problem
is”? But as I said I'd like to use the GUI.
There were issues in 6.3 with the GUI appending @MAPSET to names whereas
the i.* commands couldn't deal with such names. This was corrected since
(but probably after 6.3 came out). You might want to try with 6.4 (IIUC,
there should be a Lenny package available in the gfoss.it repository soon).
Let's try with the Supervised using the group and sub-group that worked
before:
(GUI: Imagery → Classify image → Interactive input for supervised
classifications)
i.class window, say I want to use the NIR band to draw my truths:
lsat5_1987_40
(good)
group
lsat_try (the group that worked before)
(good)
sub (if I type list to see the available sub-groups I get: no subgruop
available in the current mapset)
the same happens if I create a group and sub in the user mapset using the
copied images.
What am I doing wrong? :,(
Can't help you on this one, but maybe same issue of file naming ?
Moritz
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