Re: plotting NARR data

Clint,

Are you referring to the small slivers of missing data in three
corners as seen on this page?

   http://www.ncl.ucar.edu/Applications/narr.shtml

The original NARR Eta-12 model grid is regridded to NCEP standard
grid 221 for public distribution, Lambert conformal conic, which you
see here.

There is a slight mismatch between the chosen grid boundaries,
resulting in the slivers of missing data. This is discussed on
pages 39, 41, 42 of this early Powerpoint summary from NCEP (2005).
  Page 42 is the picture that speaks a thousand words:

   http://www.emc.ncep.noaa.gov/mmb/rreanl/narr.ppt

Dave Allured
CU/CIRES Climate Diagnostics Center (CDC)
http://cires.colorado.edu/science/centers/cdc/
NOAA/ESRL/PSD, Climate Analysis Branch (CAB)
http://www.cdc.noaa.gov/

Clint Rowe wrote:
> I'm trying to plot NARR data (GRIB format) and am able to reproduce the
> examples shown on the NCL website. I have a question about the maps
> that are produced, however. If the data are on a native grid and the
> map is specified by the data in the GRIB file (corners, true parallels,
> central meridian, etc) then why does the data not fill the entire
> rectangular box plotted by NCL? Specifically, why are edges of the data
> area curved?
>
> Clint

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Received on Wed Aug 06 2008 - 12:56:01 MDT