[GRASS-dev] [GRASS GIS] #2036: Failed watershed analysis on Grass

[GRASS GIS]

#2036: Failed watershed analysis on Grass
--------------------------+-------------------------------------------------
  Reporter:  mehmeto      |       Owner:  grass-dev@…              
      Type:  defect       |      Status:  closed                   
  Priority:  normal       |   Milestone:  6.4.4                    
 Component:  Raster       |     Version:  6.4.2                    
Resolution:  fixed        |    Keywords:  LFS, r.watershed         
  Platform:  MSWindows 7  |         Cpu:  x86-64                   
--------------------------+-------------------------------------------------

Comment(by hamish):

 Replying to [comment:6 mehmeto]:
 > Tried to do the same analysis with Spearfish data that also is in the
 > installation package and it worked. It should be a memory problem
 indeed.
 > (although Spearfish map looks larger)

 Hi,

 I think there was a missing step at the start where you need to right
 click on the elevation map name in the layer manager and choose "Set
 computational region from selected map(s)".

 I've done a number of updates to that tutorial, but I still need to merge
 them into the GRASS wiki,

 https://trac.osgeo.org/osgeo/changeset?new=10348%40livedvd%2Fgisvm%2Ftrunk%2Fdoc%2Fen%2Fquickstart%2Fgrass_quickstart.rst&old=9076%40livedvd%2Fgisvm%2Ftrunk%2Fdoc%2Fen%2Fquickstart%2Fgrass_quickstart.rst

 Note I had to go full-Spearfish for the live disc tutorial
 (http://live.osgeo.org) since we didn't have enough room for both the NC
 grass location and the semi-cloned NC shapefile/geotiff shared dataset. In
 practice my idea to make the tutorial generic for both sample datasets
 didn't work well anyway. Also the watershed threshold size given for
 Spearfish should be different for NC. Still todo for the live disc is a
 script to re-create the GRASS NC location by importing those source files,
 but I think first to remake the geotiffs for Helena with the newer
 r.out.gdal magic for correct data types and better metadata.
 We are also working on a "big data" directory for people with the live
 disc booting from e.g. 8gb USB sticks, with an extra directory in the top
 FAT32 partition with extra data, so could store nc_08.tgz there. (rc.local
 will decide at boot time if to symlink to that data (if it is present) or
 place an index.html in that dir with links to download from online)


 Hamish

-- 
Ticket URL: <https://trac.osgeo.org/grass/ticket/2036#comment:8>
GRASS GIS <http://grass.osgeo.org>