[GRASS-dev] some questions about future development

[Maciej Sieczka]

Glynn Clements pisze:
> Markus Neteler wrote:
> 
>>> BTW, a r.external would be a great addition.
>> Yes, see:
>> http://trac.osgeo.org/grass/browser/grass/branches/releasebranch_5_4/gips/gip-0002.txt
>>
>> Still not implemented... next GSoC project?
> 
> It's not that much work.
> 
> I have attached a "first draft" patch which adds the essential support
> to lib/gis. It has only been minimally tested, but seems to work.
> 
> To test:
> 
> 1. Copy a raster map.
> 2. Export it to an image at its native resolution.
> 3. Create a cell_misc/<name>/gdal file consisting of two lines: the
> filename followed by the band number.
> 4. Edit the cellhd/<name> file so that "compressed" is 0, and (if it's
> a CELL map) "format" is 3.
> 5. Run "r.support -s <name>" to update the range.
> 
> Tomorrow, I'll look into creating an r.external module, adding null
> support, etc.

Great! Finally there would be no need to import rasters if they are
to be used only as a backdrop for digitising.

If the external GeoTIFF has overviews, will r.external support them?
Will they speed up such map's display in GRASS?

Maciek

-- 
Maciej Sieczka
www.sieczka.org