[GRASS-user] Large vector files
rez at touchofmadness.com
Sun Oct 8 14:45:53 EDT 2006
On Sun, 2006-10-08 at 13:26 +0100, Glynn Clements wrote:
> Hamish wrote:
> > > I would _highly_recommend trying r.in.xyz if you have not already done
> > > so. Especially with LIDAR and other forms of remotely-sensed data.
> > > I've had good success with it. Note there is also a parameter in
> > > r.in.xyz to control how much of the input map to keep in memory,
> > > allowing you to run the data import in multiple passes.
> > note the r.in.xyz memory parameter is to help with massive RASTER
> > regions, nothing directly to do with the size of the input file.
> > The input file is not kept in memory! The output raster grid is.
> > I am always looking for feedback on how r.in.xyz goes with massive input
> > data. (>2gb? >4gb?)
> r.in.xyz doesn't use LFS, so it will be limited to 2Gb on 32-bit
> systems (any system where "long" is 32 bits). As it uses ANSI stdio
> functions (including ftell/fseek), extending it to support large files
> would be non-trivial.
Attached is a quick patch to enable LFS. It's "poorly" implemented with
fseeko/ftello, so I'm not sure if I should commit it.
Brad Douglas <rez touchofmadness com> KB8UYR
Address: 37.493,-121.924 / WGS84 National Map Corps #TNMC-3785
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