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

[mitch_TX]

Thanks Moritz,
I couldn't find r.composite :working:..too much work.

As far as the 6.4, I'm looking forward to giving it a shot.

Thanks again,
mitch




Moritz Lennert wrote:
> 
> 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_40 at landsat green=lsat5_1987_50 at landsat
>> blue=lsat5_1987_30 at 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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> 

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