[GRASSLIST:4312] Re: more gdal help!

[Glynn Clements]

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 :(

-- 
Glynn Clements <glynn.clements at virgin.net>