[GRASS-dev] d.rast.multi ?

[Newcomb, Doug]

Yann,
About all I can recommend is the vrt format tutorial,
http://www.gdal.org/gdal_vrttut.html, gdal,  data model
http://www.gdal.org/gdal_datamodel.html, and driver tutorial,
http://www.gdal.org/gdal_drivertut.html  , etc in the gdal online
documentation. You might look at the existing gdal/GRASS interface code.
I'm not a C programmer yet, so I can't help much there.

Doug

On Tue, Mar 19, 2013 at 10:01 PM, Yann Chemin <yann.chemin at gmail.com> wrote:

> Thank you Doug,
>
> yes r.patch is a good alternative, but it means writing to disk etc.
> Was more thinking of a display memory thingy.
>
> Been thinking about the virtual rasters indeed, maybe will have a
> look, any C code page you could direct me to?
>
> Cheers,
> Yann
>
> On 20 March 2013 05:39, Newcomb, Doug <doug_newcomb at fws.gov> wrote:
> > Yann,
> > If I have a large number of layers, I usually do it from a command line
> or
> > with a script.  I done r.patch with over 100 layers in one command (
> before
> > I discovered gdalbuildvirt :-))
> >
> > Doug
> >
> >
> > On Tue, Mar 19, 2013 at 4:36 AM, Vaclav Petras <wenzeslaus at gmail.com>
> wrote:
> >>
> >> On 19 March 2013 09:31, Yann Chemin <yann.chemin at gmail.com> wrote:
> >> > OK found Ctrl+Shift+L in wxGUI
> >> >
> >> Yes, it is my favorite feature. I use it even to find and add one map.
> >>
> >> However, there is some issue with many layers in layer manager. If you
> >> load more than 20 (?) layers (maps) only some of them will be
> >> rendered. There were no investigations; maybe it applies only to
> >> vectors. And, of course, it is slow.
> >>
> >> > Thanks !
> >> > Yann
> >> >
> >> > On 19 March 2013 13:56, Yann Chemin <yann.chemin at gmail.com> wrote:
> >> >> I am dealing with hourly Microwave data that are not covering the
> >> >> whole World in each layer.
> >> >>
> >> >> To have a decent presentation map of the data, I'd like to get a set
> >> >> (say 30-50 layers) displayed in one go.
> >> >>
> >> >> OK I could do it with the png driver in a script (which is what it
> may
> >> >> eventually become), but for the sake of knowledge, is there a GUI
> >> >> option to load a (rather large) set of images in one block without
> >> >> having to struggle with a cluttered GIS Manager?
> >> >>
> >> >> Thanks
> >> >> Yann
> >> >>
> >> >> --
> >> >> Yann Chemin
> >> >> Researcher at IWMI
> >> >> Skype/FB: yann.chemin
> >> >
> >> >
> >> >
> >> > --
> >> > Yann Chemin
> >> > Researcher at IWMI
> >> > Skype/FB: yann.chemin
> >> > _______________________________________________
> >> > grass-dev mailing list
> >> > grass-dev at lists.osgeo.org
> >> > http://lists.osgeo.org/mailman/listinfo/grass-dev
> >> _______________________________________________
> >> grass-dev mailing list
> >> grass-dev at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/grass-dev
> >
> >
> >
> >
> > --
> > Doug Newcomb
> > USFWS
> > Raleigh, NC
> > 919-856-4520 ext. 14 doug_newcomb at fws.gov
> >
> ---------------------------------------------------------------------------------------------------------
> > The opinions I express are my own and are not representative of the
> official
> > policy of the U.S.Fish and Wildlife Service or Dept. of the Interior.
> Life
> > is too short for undocumented, proprietary data formats.
>
>
>
> --
> Yann Chemin
> Researcher at IWMI
> Skype/FB: yann.chemin
>



-- 
Doug Newcomb
USFWS
Raleigh, NC
919-856-4520 ext. 14 doug_newcomb at fws.gov
---------------------------------------------------------------------------------------------------------
The opinions I express are my own and are not representative of the
official policy of the U.S.Fish and Wildlife Service or Dept. of the
Interior.   Life is too short for undocumented, proprietary data formats.
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