[GRASSLIST:4314] Re: more gdal help!

[Markus Neteler]

On Sun, Aug 18, 2002 at 11:50:05PM +0100, Glynn Clements wrote:
> 
> Markus Neteler wrote:
> 
> > > > > The purpose of r.composite was to counter the complaints which arose
> > > > > when I removed the composite map generation functionality from several
> > > > > programs (e.g. d.his, r.in.*).
> > > > > 
> > > > > Some people seemed to want that functionality, although I still
> > > > > haven't discovered why.
> > > > 
> > > > ... eg. to put RGB composed images onto the web:
> > > > MODIS/TERRA remote sensing
> > > > http://mpa.itc.it/rs/
> > > > (work in progress)
> > > 
> > > If you just want colour images, use r.out.ppm3 then convert the PPM to
> > > your preferred image format with an image processing tool. 
> > 
> > Yes, a possible way. But when I want to overlay some other maps (vector)
> > I need it within GRASS.
> 
> Maps which comprise three separate channels can be displayed with
> d.rgb.
> 
> > OK, there is the PNG driver...
> > But to drape it over DTM (NVIZ) you really need the composite inside
> > GRASS.
> 
> Aha! That *does* need to be a single composite map, AFAICT. That can
> be fixed; but not in time for 5.0.0 :(

Well, again: r.composite does exactly this job. So I am happy with that.

Markus