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Subject: Degrib 1.50
Date: Fri, 07 May 2004 18:33:29 -0400
From: Arthur Taylor
To: arthur.taylor@noaa.gov

Hi everyone,

You all have the unique distinction of being registered on my degrib
(aka NDFD_GRIB2Decoder) mailing list (all 398 of us) (I'd like to
welcome: boede272, joe.dominguez, jmccoy, gary.sanders)

Please let me know (email me) if you want to unregister. The latest
version of the program is on: www.nws.noaa.gov/mdl/NDFD_GRIB2Decoder/

----------- General News.

----------- News about this release:
I have just finished putting together version "1.50" (last one that I
announced was "1.48" on 4/1/2004).
This release is mainly focused on giving degrib the ability to write
NetCDF files.

To find out about NetCDF files, go to:
http://www.unidata.ucar.edu/packages/netcdf/

1) Degrib can now create a type of NetCDF files (.nc) which is based (as
far as I can tell) on the "CF-1.0" convention
(http://www.cgd.ucar.edu/cms/eaton/cf-metadata/index.html). To do so
from the command line use "-NetCDF 1" (the 1 is to denote that this is
the first version of NetCDF in the degrib code, but there may be more).
From the GUI, select it as a "file type" on the "GIS tab"

1a) Currently, it converts 1 GRIB message to 1 NetCDF file (which is
similar to what it can do for "GrADS"). In future releases I would like
to be able to convert multiple GRIB messages to 1 NetCDF file.

1b) Currently, it stores the data on the projected grid, and stores the
latitudes / longitudes of that grid in appropriate variables. In the
future I would like the ability to interpolate to a coverage grid
(similar to my GrADS methods), since most free NetCDF viewers (see:
http://meteora.ucsd.edu/~pierce/ncview_home_page.html) seem to prefer
lat / lon grids.

1c) I would appreciate comments as to the "NetCDF attributes" that I
provided, and any attributes that I am missing.

---

2) For the command line program, the -C option had a default of -Flt.
That is "create a .flt file". I have now decided to make the default be
to NOT create the .flt file, since people could be using -Shp or -Csv or
-NetCDF, and never need the -Flt option.

3) Bug fix: writeshp.c::gribWriteShp() Incorrect in computation of
fieldLen1 and fieldLen2. It didn't handle a min values of "-0.01"
correctly, since it assumed log10() was always positive.. log10(0.01) =
-2. Found this bug due to "aviation GRIB1 Supercooled large droplet"
testing.

4) Undesired behavior in -P -Interp: Probing points outside the grid
returns 9999. This is undesired for Lat/Lon grids which have the left
border 1 grid cell away from the right border. In that particular case,
we can interpolate outside the grid.

5) Bug fix for web.tcl: Occasional 0 byte files - Hypothesis, the http
lines were full. Solution: More attempts, pause between attempts, added
a diagnostic message.

6) Updated the version of "emapf-c"

7) Switched the recommended rounding of QPF variables (in the GUI) from
1 decimal to 2 decimals. (so we can see forecasts of .01 inches).

8) Cosmetic bug fix for GIS tab browse on "program files". (The space
bug bytes again!)

-----------

Please let me know if you have problems.

Regards,
Arthur

    US Dept of Commerce
    National Oceanic and Atmospheric Administration
    National Weather Service
    Meteorological Development Laboratory
    1325 East West Highway
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    Page last Modified: August 10, 2009.
Degrib Questions? Arthur Taylor
NDFD Questions? nws.ndfd@noaa.gov
XML Questions? Paul Hershberg & John Schattel
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