[Gdal-dev] compose seperate band satellite images.

[Zhonghai Wang]

thanks Frank, following your sugesstions I've got the raster image.

zhonghai


On 6/8/06, Frank Warmerdam <warmerdam at pobox.com> wrote:
>
> Zhonghai Wang wrote:
> > Hi there,
> >
> > I've got three satellite images B0, B1 and B2 from the Internet, where:
> >
> > B0 for the BLUE band, Landsat band 1
> > B1 for the GREEN band, Landsat band 2
> > B2 for the RED band, Landsat band 3
> >
> > and I am trying to compose them together in one GeoTIFF image using
> > openEV, here I've got some strange symptoms:
> >
> > if I set the stack order as B0 B1 B2 (from top to bottom), I get a image
> > color; if I set the stack order as B2 B1 B0 (from top to bottom), I get
> > another image color. This is a little bit weird for me, since each image
> > has its own band color, and these colors are the real color, i.e RGB, if
> > I compose these three image together, the composed image should have the
> > nature color, and this should be unique.
> >
> > frankly say, I am not very good at remote sensing things, your thoughts
> > will be very helpful for me.
>
> Zhonghai,
>
> OpenEV and GDAL don't know which band ought to be red, green or blue
> except based on the order you compose them.  So you should put the
> band you want to be red first (B2), then green (B1) then blue (B0).
>
> Best regards,
> --
>
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam,
> warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President OSGF, http://osgeo.org
>
>
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