[Ncep.list.emc.fv3gfs_tickets] FV3GFS Ticket #17: Explore use of GMTED2010 terrain data

FV3GFS Trac Ticket ncep.list.emc.fv3gfs_tickets at noaa.gov
Tue Aug 15 21:11:26 UTC 2017

#17: Explore use of GMTED2010 terrain data
  Reporter:  george.gayno@…  |      Owner:  george.gayno@…
      Type:  task            |     Status:  accepted
  Priority:  major           |  Milestone:
 Component:  component1      |    Version:
Resolution:                  |   Keywords:  GMTED2010

Comment (by george.gayno@…):

 One final test of the impact of switching from "-O0" to "-O3" for the Cray
 build (done at r96596, see comment:8).  A uniform C768 grid was tested and
 the raw orography fields were checked.

 Timing: The "-O3" orography generation test ran in 4:51, and the "-O0"
 test ran in 9:43.

 Differences in the raw orography were confined to the center row and
 column of each tile.  Some tiles had differences along a tile edge.  The
 max/min differences for each tile were:
 * Tile 1, minus 15 to 9 meters
 * Tile 2, minus 12 to 9 meters
 * Tile 3, minus 1.5 to 2.5 meters
 * Tile 4, minus 5 to 5 meters
 * Tile 5, minus 8 to 6 meters
 * Tile 6, minus 0.9 to 1.8 meters

 A graphic to follow.

Ticket URL: <https://svnemc.ncep.noaa.gov/trac/fv3gfs/ticket/17#comment:13>
fv3gfs <https://svnemc.ncep.noaa.gov/trac/fv3gfs>
NGGPS FV3GFS Development

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