CODEWITHSUNDEEP
gribcdo-climate
HKandulla
HKandulla

Reputation: 1121

How to extract readable values from .grib2

I have installed wgrib2 and degrib but cannot figure out how to extract values (human readable) for a specifig lat/lng.

degrib multi_1.nww3.t00z.grib2 -P -pnt -33.883,18.254

gives me:

SWPER, [s], 201403290000, 201403300900, 9999.000
WVDIR, [Degree true], 201403290000, 201403300900, 9999.000
SWDIR, [Degree true], 201403290000, 201403300900, 9999.000
...

Thanks!

Upvotes: 2

Views: 1059

Answers (2)

ClimateUnboxed
ClimateUnboxed

Reputation: 8087

Just in case someone wants to do this and they don't have degrib and wgrib2 installed, you can extract a point directly with cdo and output to a netcdf file:

cdo -f nc remapnn,lon=18.254/lat=-33.883 in.grb out.nc

"remapnn" means nearest neighbour remapping and this thus extracts the nearest gridpoint to the desired lon/lat without interpolation. You can then examine those values with 

ncdump out.nc

Upvotes: 1

HKandulla
HKandulla

Reputation: 1121

ok. i found the "mistake": the command ist correct and works if there is data for the given point. 9999.000 is the output if there is no data for the given point.. maybe it helps someone

Upvotes: 0

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