grib2ctl.pl

[Scott Weaver]

Hello everyone,

I am wondering if there is a version (or where/how to modify my version)
of grib2ctl.pl to my specific needs in terms of declaring an alternative
longitudinal domain as well as horizontal grid point resolution.

I am working with NARR (only North America, not global)data which has a
horizontal resolution of 0.33 degrees.  When I use the version of
grib2ctl.pl for that resolution the file sizes are very large.  I suspect
due to the fact that the global domain is used thus writing many undefined
values to the file.  I have another version which truncates the domain
nicely to my needs (180W to 30W) but degrades the resolution to 0.5
degrees. My 2 questions are:

1-Am I correct in my suspicion that the file sizes are too large due to
most of the northern hemisphere being populated with undefined values?

2-If so, is there a way I can modify (I have no experience with C or
pearl) or acquire a new version of grib2ctl.pl that will have the nicely
truncated domain but will not degrade the horizontal resolution?

Thank You,
Scott

_____________________________________________
Scott J. Weaver
Graduate Research Assistant
Department of Atmospheric and Oceanic Science
University of Maryland
College Park, MD 20742