On Wed, 20 Feb 2008, Jelle Ferwerda wrote:
Hi all,
A few moments I subscribed to the decoders mailing list. Great facility.
I am looking for some assistence.. Let me start off by explaining I am a fair
newby when it comes to programming java, although I do have experience in IDL,
PHP programming.
I am trying to implement a decoder to decode EUMETSET multi sensor
precipitation estimate data
(http://www.eumetsat.int/home/Main/Access_to_Data/Meteosat_Meteorological_Products/Product_List/SP_1119538666663?l=en
on this page also a link to datafile downloads)
I have downloaded the GRIBjava decoder. I am now trying to build a decoder so
that I can retrieve the MPE data.
Unfortunately when I get to the point of accessing the file and trying to get
the individual grid definitions I get an error.
The error:
Jelle,
The Grib2 decoder isn't a batch file decoder for getting data. The idea is
to make an index for the file using Grib2Indexer <fileName> and to use the
Index to find what parameter to actually decode the requested parameter
data. The design was the result of very large Grib files.
% Grib2Dump <fileName> shows the metadata of each record.
% Grib2Indexer <fileName> gives the index of the file
The file IndexFormat.txt in the root of the distribution explains the
details of a Grib index. sample line:
0 0 0 6 2 103 2.0 255 0.0 2008-02-11T14:00:00Z 0 -418705429 121261 121342
% Grib2GetData <fileName> <GDS offset> <PDS offset> gets the data for
record
from above sample index line:
% Grib2GetData <fileName> 121261 121342
Don't forget to set the CLASSPATH variable to the jar file.
I'll download a test file to see if there are any problems decoding this
type of data.
Robb...
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Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/
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