[Met_help] Re: netcdf data for use with MET verification software

John Halley Gotway johnhg at rap.ucar.edu
Wed Dec 10 09:29:24 MST 2008


These parameters define the grid on which the data resides.  The numbers
correspond to how a Lambert Conformal grid is defined in a GRIB record. 
Look on this page for the section on Lambert Conformal grids:

When referring to this table, here is the correspondence between the
contents of the NetCDF attributes and the contents of the GRIB table for
Lambert Conformal grids:
p1_deg = Latin 1
p2_deg = Latin 2
p0_deg = La1 (Latitude of the first grid point)
l0_deg = Lo1 (Longitude of the first grid point)
lcen_deg = Lov (Center longitude)
d_km = Dx and Dy, but specified in km, not meters

I realize that this in not very straight-forward, and I apologize for
that.  We had not anticipated that users would be using NetCDF files
directly with MET.  This NetCDF output of the PCP-Combine tool was
originally meant as an intermediate data format within MET.

For the next version of MET, version 2.0 in February, we're working on
making it easier to use NetCDF files in MET.

Thanks and good luck,

> Hi, John,
> I saw your comments on the netcdf data for with MET verification software
> at:
> http://www.ncl.ucar.edu/Support/talk_archives/2008/1066.html
> I am wondering whether you could do me a favor by explaning to me the
> physical meaning of following variables:
> - p1_deg = "25.000000 degrees_north" ;
> - p2_deg = "25.000000 degrees_north" ;
> - p0_deg = "12.190000 degrees_north" ;
> - l0_deg = "-133.459000 degrees_east" ;
> - lcen_deg = "-95.000000 degrees_east" ;
> - d_km = "40.635000 km" ;
> Thanks a lot for your help!
> Best regards,
> Linlin

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