[GRASS-user] band combinations using GRASS
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 <mailto: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
Re: [GRASS-user] band combinations using GRASS
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 <mailto: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 <jo...@sigte.udg.edu
<mailto:jo...@sigte.udg.edu>> 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 <tel:%2B34%20972%20418%20039> (7026 intern)
jo...@sigte.udg.edu <mailto: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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Re: [GRASS-user] r.li modules
Ok, thank's Markus. We keep in contact, Best Josep Sitjar El 18/01/14 15:20, Markus Neteler escribi: Hi Josep, next week I'll try to dedicate some time to r.li.* to check its state! Please ping me in a week if I didn't respond. Best Markus -- http://gis.cri.fmach.it/neteler/ On Mon, Jan 13, 2014 at 9:55 AM, Josep Sitjar jo...@sigte.udg.edu wrote: Dear list, I'm trying to use GRASS r.li modules to obtain some landscape metrics from a raster map. I've been working with PatchAnalyst, Fragstats or LecoS and I've no problems, but I've problems to interpret the results obteined with r.li. I don't get a value for a metric (ex. r.li.patchdensity or r.li patchnum), but a raster map. I configure the region (r.li.setup) as it's the GRASS manual, defining the region fon analysis as 'Whole maplayer' and the sampling area as 'Moving Window'. Could someone help me to interpretate the results? Thank's in advance. -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] r.li modules
Dear list, I'm trying to use GRASS r.li modules to obtain some landscape metrics from a raster map. I've been working with PatchAnalyst, Fragstats or LecoS and I've no problems, but I've problems to interpret the results obteined with r.li. I don't get a value for a metric (ex. r.li.patchdensity or r.li patchnum), but a raster map. I configure the region (r.li.setup) as it's the GRASS manual, defining the region fon analysis as 'Whole maplayer' and the sampling area as 'Moving Window'. Could someone help me to interpretate the results? Thank's in advance. -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
[GRASS-user] Geometric correction with GRASS
Hi, I'm working with an SPOT scene, which is preprocessed at the level 1A. Now I need to do a geometric correction of this scene, not only with control points but also with a Digital Terrain Model. It's possible to do this in GRASS? How? Thank you in advance, Josep -- ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Geometric correction with GRASS
Thank you very much Nikos, your comments will be very useful for me. Josep On 01/15/2013 10:44 AM, Nikos Alexandris wrote: Josep: Hi, Hi Josep! I'm working with an SPOT scene, which is preprocessed at the level 1A. Now I need to do a geometric correction of this scene, not only with control points but also with a Digital Terrain Model. It's possible to do this in GRASS? How? Of course it is possible. Please, get your grip on the respective GRASS-wiki page and the related manuals. Pointers: http://grasswiki.osgeo.org/wiki/Georeferencing and http://grass.osgeo.org/grass64/manuals/gm_georect.html http://grass.osgeo.org/grass64/manuals/wxGUI.GCP_Manager.html and, of course http://grass.osgeo.org/grass64/manuals/i.ortho.photo.html Best, Nikos ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] Geometric correction with GRASS
OK Moritz, thanks for the comment.
While the linewise ortho-rectification of satellite data is not
implemented, do you know another open source solution to perform
this task?
Thanks,
On 01/15/2013 12:09 PM, Moritz Lennert wrote:
On 15/01/13 10:44, Nikos Alexandris wrote:
Josep:
Hi,
Hi Josep!
I'm working with an SPOT scene, which is
preprocessed at the level 1A.
Now I need to do a geometric correction of this scene, not
only with
control points but also with a Digital Terrain Model. It's
possible to
do this in GRASS? How?
Of course it is possible. Please, get your grip on the
respective GRASS-wiki
page and the related manuals.
Pointers:
http://grasswiki.osgeo.org/wiki/Georeferencing
and
http://grass.osgeo.org/grass64/manuals/gm_georect.html
http://grass.osgeo.org/grass64/manuals/wxGUI.GCP_Manager.html
and, of
coursehttp://grass.osgeo.org/grass64/manuals/i.ortho.photo.html
i.ortho.photo is used for aerial photography, not for satellite
imagery. There is currently no orthorectification of satellite
images in GRASS. It is on the ToDo list though:
http://trac.osgeo.org/grass/wiki/Grass7/ImageryLib =
"Implement/finish linewise ortho-rectification of satellite data"
Moritz
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Re: [GRASS-user] Geometric correction with GRASS
Thanks to all for your comments, are very helpful for me. I will work on it. Regards, Josep On 01/15/2013 03:34 PM, Margherita Di Leo wrote: Hi Josep, maybe OSSIM can be of use: http://trac.osgeo.org/ossim/wiki/orthorectification HTH, madi On Tue, Jan 15, 2013 at 1:05 PM, Josep Sitjar jo...@sigte.udg.edu wrote: OK Moritz, thanks for the comment. While the linewise ortho-rectification of satellite data is not implemented, do you know another open source solution to perform this task? Thanks, On 01/15/2013 12:09 PM, Moritz Lennert wrote: On 15/01/13 10:44, Nikos Alexandris wrote: Josep: Hi, Hi Josep! I'm working with an SPOT scene, which is preprocessed at the level 1A. Now I need to do a geometric correction of this scene, not only with control points but also with a Digital Terrain Model. It's possible to do this in GRASS? How? Of course it is possible. Please, get your grip on the respective GRASS-wiki page and the related manuals. Pointers: http://grasswiki.osgeo.org/wiki/Georeferencing and http://grass.osgeo.org/grass64/manuals/gm_georect.html http://grass.osgeo.org/grass64/manuals/wxGUI.GCP_Manager.html and, of coursehttp://grass.osgeo.org/grass64/manuals/i.ortho.photo.html i.ortho.photo is used for aerial photography, not for satellite imagery. There is currently no orthorectification of satellite images in GRASS. It is on the ToDo list though: http://trac.osgeo.org/grass/wiki/Grass7/ImageryLib = "Implement/finish linewise ortho-rectification of satellite data" Moritz ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Josep Sitjar Técnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user -- Margherita DI LEO Postdoctoral Researcher European Commission - DG JRC Institute for Environment and Sustainability (IES). Unit H03 – FRC Via Fermi, 2749 I-21027 Ispra (VA) - Italy - TP 261 Tel. +39 0332 78 3600 mar
[GRASS-user] orthorectify satellite images
Hello, I'm working with SPOT satellite images, and I need to orthorectify them. It's possible with Grass Gis? What's the procedure? Thanks for your answers. Josep -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] orthorectify satellite images
Ok, thank's Josep On 14/09/12 14:27, Markus Neteler wrote: On Fri, Sep 14, 2012 at 2:13 PM, Daniel Lee l...@isi-solutions.org wrote: Hi Josep, Yes, try i.ortho.photo. I don't think that this works for line scanner based satellite images since it is made for aerial images. We should implement some RPC based method in GRASS. Markus -- Josep Sitjar Tcnico SIG Tel. (34)972418039 www.sigte.udg.edu ___ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user
