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<p class="MsoNormal">Dear all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I tried to extract a river network from a huge DEM:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">rows: 180752<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">cols: 141312<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">cells: 25542426624<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">r.watershed (in an older revision of GRASS 7) had no problem with the DEM and created raster streams very nicely. However, I could not convert them to vector because r.to.vect complained the streams weren’t thinned properly.
Since I would like to continue with the other r.streams.* addons anyway, I tried running r.stream.extract. On the entire DEM it failed with the error message below:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">(Mon Apr 13 23:21:30 2015)
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">r.stream.extract --verbose elevation=dem_10m_nosefi_float@PERMANENT accumulation=dem_10m_nosefi_float_accum@Hydrologi threshold=1500 stream_length=5 memory=50000 stream_raster=dem_10m_nosefi_float_streams_ids stream_vector=dem_10m_nosefi_float_streams_ids<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">4.23% of data are kept in memory<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Will need up to 1285.49 GB (1316340 MB) of disk space<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Creating temporary files...<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Loading input raster maps...<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">ERROR: Unable to load input raster map(s)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">(Wed Apr 15 12:44:30 2015) Command finished (2243 min 0 sec)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">From the error message (Unable to load input raster map(s)), I have no idea where I could start searching for the problem…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">On a smaller catchment (with all in RAM calculation) r.stream.extract works fine…<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any ideas how to fix this? Running r.stream.extract per catchment (delineated earlier with r.watershed) would be a possible workaround…
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Cheers<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Stefan<o:p></o:p></span></p>
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