On Mon, 28 Jun 2004, Arild Burud wrote:
Robb Kambic wrote:
> Thanks again for the gribtocdl code. I wonder if version 3.0.0 had the
> same problem as 3.0.2?
Well, I didn't have the problem in the first version of
gribtocdl/gribtonc. Haven't tested the intermediate versions, but it
sort of made sense to see that valtime_offset was introduced together
with this problem.
> At first thought, I don't see how the
> forecasttime variable could cause this problem but maybe there is a
> dependancy that I over looked. I'll check it out.
Arild,
The dependancy that I over looked was the calculation of the variable
valtime_offset was delayed until gribtonc was invoked in the previous
version of gribtocdl. My calculation of valtime_offset in gribtocdl needed
to invoke the routine frcst_time() to obtain the correct value.
gribtocdl now creates the correct cdl for the sample data set you sent and
the results of gribtonc now only has one record.
As I said, changing the "Time 2 (P2) : 24" into "Time 2 (P2) : 0" in the
grib data completely removed the problem. At least I view it as a
problem when a "monthly mean" dataset becomes two datasets 24 hours
apart....
As "Time 2 (P2)" is mostly used as "Time interval between successive
analysis" it seemed logical that it could also be retreived as
"valtime_offset".
Anyway there is no hurry to fix this, but I just wanted to inform you of
my findings.
Thanks for the bug report, I put a version of gribtocdl.c in the ftp dir
if you want to try it out. There will probably be a decoders release in a
couple of weeks.
Robb...
Arild
--
---------------------------------------------------------------------
Arild.Burud@xxxxxx System Developer Tel.: +47 22963035
http://www.met.no Fax.: +47 22963050
Norwegian Service Centre for Climate Modelling, http://noserc.met.no
Norwegian Meteorological Institute, PB 43 Blindern, N-0313 Oslo
---------------------------------------------------------------------
==============================================================================
Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/
==============================================================================