Re: [GRASS-user] band combinations using GRASS

2015-12-12 Thread Markus Neteler 
On Thu, Dec 10, 2015 at 2:09 PM, Paul Shapley  wrote:
> Hi Josep,
>
> My apologies but i should have read your email thoroughly. Please check the
> link below hope this helps you.
>
> http://www.paulshapley.com/2014/04/processing-landsat-8-bands-in-grass-gis.html

Another option is to use
https://grass.osgeo.org/grass70/manuals/i.colors.enhance.html

For an example, see e.g.

http://courses.neteler.org/processing-landsat8-data-in-grass-gis-7/
--> 7. Natural color view (RGB composite)

Markus
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[GRASS-user] band combinations using GRASS

2015-12-10 Thread Josep Sitjar 

Dear all,
I'm working with r.composite to create a natural color band combination 
using Landsat 8 image. The result is a very dark image, so I would like 
to know if there's any way to improve it. I'm using GRASS 6.X and also 
GRASS 7.


Thanks in advance,

--
*Josep Sitjar Suñer*
Tècnic SIG / Servei de Sistemes d'Informació Geogràfica i Teledetecció
-
Universitat de Girona
*SIGTE*
-
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7026 intern)
jo...@sigte.udg.edu 

http://www.sigte.udg.edu
Twitter http://twitter.com/SIGTE_UDG

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Re: [GRASS-user] band combinations using GRASS

2015-12-10 Thread Paul Shapley 
Hi Josep,

The images probably need a 'Histogram Stretch' using 'r.colors' use the
'grey' (color) and tick Histogram Stretch' but make sure you set 'g.region'
to the full image first otherwise it wont work.

Paul Shapley

On 10 December 2015 at 11:03, Josep Sitjar  wrote:

> Dear all,
> I'm working with r.composite to create a natural color band combination
> using Landsat 8 image. The result is a very dark image, so I would like to
> know if there's any way to improve it. I'm using GRASS 6.X and also GRASS
> 7.
>
> Thanks in advance,
>
> --
> *Josep Sitjar Suñer*
> Tècnic SIG / Servei de Sistemes d'Informació Geogràfica i Teledetecció
> -
> Universitat de Girona
> *SIGTE*
> -
> Pl. Ferrater Mora 1
> 17071 Girona
> Tel +34 972 418 039 (7026 intern)
> jo...@sigte.udg.edu
>
> http://www.sigte.udg.edu
> Twitter http://twitter.com/SIGTE_UDG
>
>
> ___
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>



-- 
*Paul J. Shapley *MSc CGeog (GIS) FRGS
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Re: [GRASS-user] band combinations using GRASS

2015-12-10 Thread Paul Shapley 
Hi Josep,

My apologies but i should have read your email thoroughly. Please check the
link below hope this helps you.

http://www.paulshapley.com/2014/04/processing-landsat-8-bands-in-grass-gis.html

Regards,

Paul Shapley



On 10 December 2015 at 11:03, Josep Sitjar  wrote:

> Dear all,
> I'm working with r.composite to create a natural color band combination
> using Landsat 8 image. The result is a very dark image, so I would like to
> know if there's any way to improve it. I'm using GRASS 6.X and also GRASS
> 7.
>
> Thanks in advance,
>
> --
> *Josep Sitjar Suñer*
> Tècnic SIG / Servei de Sistemes d'Informació Geogràfica i Teledetecció
> -
> Universitat de Girona
> *SIGTE*
> -
> Pl. Ferrater Mora 1
> 17071 Girona
> Tel +34 972 418 039 (7026 intern)
> jo...@sigte.udg.edu
>
> http://www.sigte.udg.edu
> Twitter http://twitter.com/SIGTE_UDG
>
>
> ___
> grass-user mailing list
> grass-user@lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>



-- 
*Paul J. Shapley *MSc CGeog (GIS) FRGS
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Re: [GRASS-user] band combinations using GRASS

2015-12-10 Thread Josep Sitjar 

Dear Paul and Manfred,
thanks for you interest. It works.

According to your indications, I've applied a greyscale equalisation to 
each band (using r.colors) previous to the band combination. And the 
result is perfect.


Thanks,

*Josep Sitjar Suñer*
Tècnic SIG / Servei de Sistemes d'Informació Geogràfica i Teledetecció
-
Universitat de Girona
*SIGTE*
-
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7026 intern)
jo...@sigte.udg.edu 

http://www.sigte.udg.edu
Twitter http://twitter.com/SIGTE_UDG

El 10/12/15 a les 14:03, Paul Shapley ha escrit:

Hi Josep,

The images probably need a 'Histogram Stretch' using 'r.colors' use 
the 'grey' (color) and tick Histogram Stretch' but make sure you set 
'g.region' to the full image first otherwise it wont work.


Paul Shapley

On 10 December 2015 at 11:03, Josep Sitjar > wrote:


Dear all,
I'm working with r.composite to create a natural color band
combination using Landsat 8 image. The result is a very dark
image, so I would like to know if there's any way to improve it.
I'm using GRASS 6.X and also GRASS 7.

Thanks in advance,

-- 
*Josep Sitjar Suñer*

Tècnic SIG / Servei de Sistemes d'Informació Geogràfica i Teledetecció
-
Universitat de Girona
*SIGTE*
-
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039  (7026 intern)
jo...@sigte.udg.edu 

http://www.sigte.udg.edu
Twitter http://twitter.com/SIGTE_UDG


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--
*Paul J. Shapley *MSc CGeog (GIS) FRGS
*
*


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