Splitting/tiling a raster

[Bart van den Eijnden]

Which format is your raster currently in?

If it is performance, building overviews could also help for certain situations.

At which scales do you display your raster? Also at full extent?

Best regards,
Bart

Bart van den Eijnden
Syncera IT Solutions
Postbus 270
2600 AG  DELFT

tel.nr.: 015-7512436
email: BEN at Syncera-ITSolutions.nl

>>> Stefan Schwarzer <stefan.schwarzer at GRID.UNEP.CH> 07/12/05 11:55am >>>
Thanks Bart for the quick response,

aehh, yes, performance. But perhaps there is no need to split it up?  
Is it that what you mean? Gush, somehow I don't really get it how  
this tiling works, stupid me....

Stef


> Hi Stefan,
>
> since gdal_translate has the option to select a subwindow (srcwin)  
> from your sourcefile, you can use it to split your raster file into  
> subimages.
>
> http://www.gdal.org/gdal_utilities.html#gdal_translate 
>
> After that, you do use gdaltindex to create a tileindex. That part  
> is described in the raster howto:
>
> http://mapserver.gis.umn.edu/doc44/raster-howto.html 
>
> Btw, what is the exact reason you want to split up your raster?  
> Performance?
>
> Best regards,
> Bart
>
> Bart van den Eijnden
> Syncera IT Solutions
> Postbus 270
> 2600 AG  DELFT
>
> tel.nr.: 015-7512436
> email: BEN at Syncera-ITSolutions.nl 
>
>
>>>> Stefan Schwarzer <stefan.schwarzer at GRID.UNEP.CH> 07/12/05  
>>>> 11:39am >>>
>>>>
> Hi,
>
> this subject is really not new. But I haven't found any real how-to
> for the whole story. Perhaps somebody could clarify the steps needed.
> when starting with an image of some larger size and when ending with
> a tiled raster. Cause I guess that' what has to be done.
> - At least I have now one single big raster. As far as I understood I
> need to split the big image into smaller ones. But how?
> - And then I can use gdaltindex to build the shapefile to define the
> tiles. Right?
>
> Thanks for clarification.
>