[GRASS-user] r.watershed segment_seek error

[Chris Caveny-Cox]

I am attempting to process a mosaiced raster through r.watershed and it's erroring out fairly early in the process with the following command output

segment_seek: Invalid argument
Failed seek in segment file for index = 0 n = 13422 at col:row 24400:20000
cseg_read_cell(): unable to segment put row for [sfdem at PERMANENT] in [PERMANENT]
segment_seek: Invalid argument
Failed seek in segment file for index = 0 n = 13422 at col:row 24400:20000
cseg_read_cell(): unable to segment put row for [sfdem at PERMANENT] in [PERMANENT]
segment_pagein: read EOF
cseg_put(): could not write segment file
 Subprocessfailed with exit code 1
category information for [sfacc1k] in [PERMANENT] missing or invalid
category information for [sfdr1k] in [PERMANENT] missing or invalid
category information for [sfba1k] in [PERMANENT] missing or invalid
category information for [sfstr1k] in [PERMANENT] missing or invalid
category information for [sfh1k] in [PERMANENT] missing or invalid

Realizing it's a fairly large raster (736557332 cells) I have tried increasing the segment library size for tile processing by increasing the amount of maximum memory to use with the disk swap option, but to no avail.  I have also tried this processing on both Linux and Windows builds of GRASS 6.4 with the same results.  Knowing that it is probably something very simple I would like to ask for your help!  I am unfamiliar with GRASS errors and have had a dickens of a time finding documentation on them.

Thanks!

Chris Caveny-Cox, MCSE | Extension Agent, 4-H Youth Development
NC State University | Gaston County, North Carolina
Phone: 704.922.2110 | Fax: 704.922.2140
chris_caveny-cox at ncsu.edu | http://gaston4-h.blogspot.com | http://gaston.ces.ncsu.edu
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