[GRASS-user] r.terraflow problem

[Markus Metz]

Aleksey Naumov wrote:
> Dear GRASS users,
>
> I am trying to run r.terraflow in GRASS 6.4.0svn (GIS library revision:
> 37101 (2009-05-10)) provided as part of the OSGeo4W bundle on WinXP. The
> command prints some output, which looks normal, and then exits right away
> without doing anything.
>
> Here is the command and the output I get:
>
> (Thu Jul 29 13:32:43
> 2010)
> r.terraflow --overwrite --verbose elevation=dem at PERMANENT filled=tf_dem
> direction=tf_fdir swatershed=tf_sink accumulation=tf_fac tci=tf_tci
> STREAM_DIR=C:/Active_projects/tmp/tf
> cell dem header compatible with region header
> stats.out: File exists
> Elevation stored as FLOAT (4B)
> Region size is 13000 x 9200

This is 119.6 million cells, too large for wingrass, r.terraflow will
most likely abort because the temporary files become too large (no
large file support in wingrass). Try r.watershed instead.

> STREAM temporary files in C:/Active_projects/tmp/tf  (THESE
> INTERMEDIATE STREAMS WILL NOT BE DELETED IN CASE OF ABNORMAL
> TERMINATION OF THE PROGRAM. TO SAVE SPACE PLEASE DELETE
> THESE FILES MANUALLY!)
> file stats.out exists - renaming.

Either manually delete the file stats.out first before running
r.terraflow or, as suggested in the other reply, update grass.

Markus M