I all!
I've imported a satellite image en grass 60, with a resolution of 0.6 m,
and 16 bits. the problem is that the white/black image is too dark and the
color one appears just as it was taken in a very foggy day. but when I open
them in windows it's all ok. can it be a problem of composition? is there
a way to adjust them on grass? I used r.in.gdal to import the images and
r.composite to compose them. in a first moment we worked on images of 8 bits
and, even if the quality wasn't good, it appeared better than now. can it
be a problem of bits?
cheers,
Chiara
Chiara Porcu
Dep. I+D
Gimena Ingenieria
Lugo - España
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On Mon, Apr 11, 2005 at 04:52:45PM +0200, Chiara Porcu wrote:
I all!
I've imported a satellite image en grass 60, with a resolution of 0.6 m,
and 16 bits. the problem is that the white/black image is too dark and the
color one appears just as it was taken in a very foggy day. but when I open
them in windows it's all ok. can it be a problem of composition? is there
a way to adjust them on grass? I used r.in.gdal to import the images and
r.composite to compose them. in a first moment we worked on images of 8 bits
and, even if the quality wasn't good, it appeared better than now. can it
be a problem of bits?
To visually improve channels, you can use r.colors (col=aspect does
sometimes a magic improvement). I assume that you are using Quickbird.
If you have all the color and panchromatic channels you can use
i.fusion.brovey to make an image fusion.
Markus
what about histogram stretch?
I wrote some script, which uses R to cut out all extrem values and tan it
provides the histogram strech using r.mapcalc
maybe it helps
see http://www.fle.czu.cz/~jachym/.../histogram_strech1.png
and attachement
Jáchym
On Tue, Apr 12, 2005 at 10:11:00AM +0200, Markus Neteler wrote:
On Mon, Apr 11, 2005 at 04:52:45PM +0200, Chiara Porcu wrote:
> I all!
>
> I've imported a satellite image en grass 60, with a resolution of 0.6 m,
> and 16 bits. the problem is that the white/black image is too dark and the
> color one appears just as it was taken in a very foggy day. but when I open
> them in windows it's all ok. can it be a problem of composition? is there
> a way to adjust them on grass? I used r.in.gdal to import the images and
> r.composite to compose them. in a first moment we worked on images of 8 bits
> and, even if the quality wasn't good, it appeared better than now. can it
> be a problem of bits?
To visually improve channels, you can use r.colors (col=aspect does
sometimes a magic improvement). I assume that you are using Quickbird.
If you have all the color and panchromatic channels you can use
i.fusion.brovey to make an image fusion.
Markus
--
Jachym Cepicky
e-mail: jachym.cepicky@centrum.cz
URL: http://les-ejk.cz
GPG: http://www.fle.czu.cz/~jachym/gnupg_public_key/
(attachments)
i.histr (4.41 KB)
Hi to all!
Has anyone found an ebuild to compile grass 6.0 on gentoo?
Thx
Luca
Hi,
there is a ebuild in gentoo bug system.
http://bugs.gentoo.org/show_bug.cgi?id=72353
I made it and it is working fine on my 3 Gentoo boxs 
Only problem is with LAPACK. On Gentoo is a 2 LAPACKs - LAPACK-3.0 and
LAPACK-ATLAS. By default Gentoo should use LAPACK-CONFIG and it
installs LAPACK-ATLAS, but for me GRASS 6 fails to build with
LAPACK-ATLAS.
I bug # 72353 are also links to other ebuilds - GEOS and GDAL. There
is GDAL in official portage, but it has no GEOS support, so grab a
ebuild form bugzilla (bug 39942).
How to use those ebuilds You can read here:
http://www.gentoo.org/doc/en/handbook/handbook-x86.xml?part=3&chap=5
Please report any problems/success.
WBR,
Maris.
On 4/12/05, Luca <thedoktor78@gmail.com> wrote:
Hi to all!
Has anyone found an ebuild to compile grass 6.0 on gentoo?
Thx
Luca
On Wed, Apr 13, 2005 at 11:45:05AM +0300, M?ris Narti?s wrote:
Hi,
there is a ebuild in gentoo bug system.
http://bugs.gentoo.org/show_bug.cgi?id=72353
I made it and it is working fine on my 3 Gentoo boxs
Only problem is with LAPACK. On Gentoo is a 2 LAPACKs - LAPACK-3.0 and
LAPACK-ATLAS. By default Gentoo should use LAPACK-CONFIG and it
installs LAPACK-ATLAS, but for me GRASS 6 fails to build with
LAPACK-ATLAS.
You don't need LAPACK at all (yet). It's an option which
is not yet used within the GRASS code.
So you may just simplify it.
Markus
Hi,
can this be mentioned in requirements file? In current version
(http://grass.itc.it/grass60/source/REQUIREMENTS.html) there is no
more notes about blas and lapack but they exist as configure options -
how then enduser can know that lapack (and blas too?) are optional and
unused nowdays?
And why the hell it needs LAPACK-3 not LAPACK-ATLAS if it doesnt get
used at all?!?
wbr,
Maris.
PS. I will fix things in grass ebuild when I will be done writing my
master work about paleohydrological modeling and GRASS GIS
On 4/14/05, Markus Neteler <neteler@itc.it> wrote:
On Wed, Apr 13, 2005 at 11:45:05AM +0300, M?ris Narti?s wrote:
> Hi,
>
> there is a ebuild in gentoo bug system.
> http://bugs.gentoo.org/show_bug.cgi?id=72353
> I made it and it is working fine on my 3 Gentoo boxs
> Only problem is with LAPACK. On Gentoo is a 2 LAPACKs - LAPACK-3.0 and
> LAPACK-ATLAS. By default Gentoo should use LAPACK-CONFIG and it
> installs LAPACK-ATLAS, but for me GRASS 6 fails to build with
> LAPACK-ATLAS.
You don't need LAPACK at all (yet). It's an option which
is not yet used within the GRASS code.
So you may just simplify it.
Markus
=?ISO-8859-13?Q?M=E2ris_Narti=F0s?= wrote:
And why the hell it needs LAPACK-3 not LAPACK-ATLAS if it doesnt get
used at all?!?
If you enable BLAS/LAPACK, some extra functions are enabled in
lib/gmath/la.c. Those functions require a compatible version of
BLAS/LAPACK in order to compile. However, nothing uses those functions
at present.
--
Glynn Clements <glynn@gclements.plus.com>
