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
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