[GRASS-user] 3D composite with RGB bands

[Markus Neteler]

On Feb 8, 2008 11:05 AM, Adrian <adrian at billiau.net> wrote:
> On Thu, 7 Feb 2008 12:57:14 -0800 (PST)
> Reno Bladergroen <Rbladergroen at tele2allin.be> wrote:
>
> >
> > Hello list,
> >
> > I am trying to make a scenery for a soaring simulation game
> > (silentwings). The common way to do this is combining RGB landsat7
> > bands (Tm3,2,1), then pan-sharpen this combination. So far I was able
> > to do pan-sharpening using grass, but I was advised (and asked by the
> > program) to choose the NIR and MIR bands. In that case I get kind of
> > funny colors (purple roads, deep blue rivers etc), not really usable
> > for the game. Can I do the same but then with the RGB bands? Do i
> > need a different approach or can I use the same using band Tm3,2,1.
> > Which band do i substitute for which?
> >
> > Thanks in advance,
> >
> > Reno
>
> The use of Near and Mid infrared bands is recommended for extracting
> information from the image, particularly about vegetation and water.
> To find the bands of the landsat 7 image that correspond to RGB, you
> would have to look at the metadata for the image, but they are probably
> bands 3,4,5.

Ususally:
1: B
2: G
3: R
4: NIR
5: MIR1
6: TIR
7: MIR2

>         All functions within grass should function the same no matter
> which bands are given as input values.

Right.

Using i.landsat.rgb often helps to obtain a nice color table:
http://grass.osgeo.org/screenshots/rs.php

Markus