#1429: r.watershed large grids
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Reporter: dnewcomb | Owner: grass-dev@…
Type: enhancement | Status: new
Priority: normal | Milestone: 7.0.0
Component: Default | Version: svn-trunk
Keywords: Large grids | Platform: Linux
Cpu: x86-64 |
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Comment(by mmetz):
Replying to [ticket:1429 dnewcomb]:
> tried r.watershed on a large elevation grid (51000 rows, 133000 columns,
6783000000 cells)
For larger grids, GRASS must be compiled with LFS: configure --enable-
largefile, and quite a bit of free disk space must be available where the
current location is living.
Apart from that, 6783000000 cells are currently too much, see recent
similar post in the user ml [0]. The current limit is 2^31^ - 1 =
2,147,483,647 cells. This can be overcome in trunk, but requires quite a
few modifications both in the segment library and in r.watershed.
Markus M
[0] http://lists.osgeo.org/pipermail/grass-user/2011-August/061724.html
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Ticket URL: <http://trac.osgeo.org/grass/ticket/1429#comment:1>
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