NOTE: The decoders mailing list is no longer active. The list archives are made available for historical reasons.
On Fri, 29 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote: > Hey me again! Another question... > from the IndexFormat.txt file: 3. Grib1 file index Section 1 same as Grib2 Section 2 Grib Records one line for each record in the file blank separated ProductType Discipline Category Parameter LevelType1 LevelValue1 255 LevelValue2 ReferenceTime ForecastTime Gdskey BmsOrGdsOffset -l DecScale BmsExists^M >0 0 -1 11 107 0 255 0 2005-07-07T00:00:00Z 69 3495848078 82 23398 1 false so: ProductType =0 Discipline =0 Category =0 Parameter =11 LevelType1 =107 LevelValue1 =0 255 // there is not level2Type in Grib1 as in Grib2 LevelValue2=0 ReferenceTime =2005-07-07T00:00:00Z ForecastTime =69 Gdskey =3495848078 BmsOrGdsOffset = 82 -l =23398 //this is probably what confused you, it's the endOfRecord offset DecScale =1 BmsExists =false the text explanation of the first eight number fields are in the one of the following files: Grib1ProductDefinitionSection.java GribPDSLevel.java Grib1GridDefinitionSection.java, and the afwa.tab robb... > > This is a line from the output of the Grib1Indexer class after being run on > a grib file. Could you label each of these fields for me? I looked in the > file talking about indexes and it didn't make much sense. > > You wrote... > > you need to look at the index file, file ending with gbx. there a > explanation of the fields, etc in the IndexFormat.txt file in the root > dir of the distribution. the important fields are: BmsOrGdsOffset > DecScale BmsExists. the last 4 fields on the product line ignoring > the -1 field. > > There is no -1 on the end of the file line and if I follow the directions > you gave me before I would be ignoring the 23398 number. The get data line > I think I should be writing is > > java -Xmx256m ucar/grib/grib1/Grib1GetData us057g1010t04a000000000 82 1 > false > > I guess I am just kind of confused but it would help me A LOT if you could > label each of the fields... Thanks again Robb! > > > > -----Original Message----- > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxxxxxxxxxx] > Sent: Wednesday, July 20, 2005 4:29 PM > To: Nelson Brandon K A1C AFWA/SCSA > Cc: decoders; support-thredds > Subject: RE: Grib File > > On Wed, 20 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote: > > > Robb, > > > > The problem is I need to write a program that automates it. This isn't a > > one time thing with a single grib file. This is something we do with 100s > > of grib files every day! Thanks again for your time! > > > Brandon, > > the grib.jar api is just a level to decode the grib files, nj22 sits ontop > of it to do the work for specifc parameters based on their parameter > name/number, level type, and level. the nj22 code is available at: > > http://my.unidata.ucar.edu/content/software/netcdf-java/index.html > > the files used to handle the grib files is located at: > src/ucar/nc2/iosp/grib in the distribution. i would download the src for > 2.2.10 and build it. run the toolUI program settng breakpoints in the src > to find the routines to perform the functions you are investigating. > > robb... > > > > > > --Brandon > > > > -----Original Message----- > > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxxxxxxxxxx] > > Sent: Wednesday, July 20, 2005 12:27 PM > > To: Nelson Brandon K A1C AFWA/SCSA > > Cc: support-thredds; decoders > > Subject: RE: Grib File > > > > On Wed, 20 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote: > > > > > Thanks again for your work Robb! Basicly what I am trying to do is pull > > out > > > specifc parameters based on their parameter name/number, level type, and > > > level. > > > > Brandon, > > > > have you looked at that web start program? it does all the tasks that you > > mention and it will write out a file with only the desired paramters. i > > will see if there is some more doc on how to use it. it's based on the > > java grib.jar that you been working with. > > > > robb... > > > > > > > > > > Could you point me in the right direction in your code on how I > > > might do this? Things like Grib1LookUp look promising but there isn't > > > enough documentation (which is ok I know it's a beta ;)) for me to > > > understand it as I am relatively new to grib files. Thanks for any > > further > > > help! > > > > > > V/r > > > Brandon > > > > > > -----Original Message----- > > > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxx] > > > Sent: Tuesday, July 19, 2005 3:20 PM > > > To: Nelson Brandon K A1C AFWA/SCSA > > > Cc: support-thredds; decoders > > > Subject: RE: Grib File > > > > > > > > > well, it looks like we did double the work. i also created a afwa.tab > and > > > added it tothe distribution. the new distribution is in the ftp > decoders > > > directory. let me know if you run into any problems. > > > > > > robb... > > > > > > > > > > > > On Tue, 19 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote: > > > > > > > I have updated your grib table with all of the ones you stated were > > > missing. > > > > Let me know when you put this into the build so I can check it out and > > see > > > > if there are anymore unknown parametes. Also it is not Air Force > Global > > > > Weather Center anymore. We are called Air Force Weather Agency! > > > > > > > > Thanks a bunch again Robb! Really been a help and I appreciate your > > time! > > > > > > > > --Brandon > > > > > > > > -----Original Message----- > > > > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxxxxxxxxxx] > > > > Sent: Monday, July 18, 2005 12:10 PM > > > > To: Nelson Brandon K A1C AFWA/SCSA > > > > Cc: support-thredds; decoders > > > > Subject: RE: Grib File > > > > > > > > > > > > Brandon, > > > > > > > > after viewing the data, i discovered many missing parameters. i > couldn't > > > > find these on the web, do you know a location for a table? or do you > > know > > > > the name, short desc, long desc, and units for the following parameter > > > > numbers. > > > > > > > > 134-137, 140-143, 145-149, 151, 152 155 157, 161, 163, 165-171, > 191-194, > > > > 197, 199, 208, 209, 220-223, 227, 228, 230-239, 241, 246, 248-254 > > > > > > > > robb... > > > > > > > > > > > > > > > > > > > > > > > > On Mon, 18 Jul 2005, Robb Kambic wrote: > > > > > > > > > On Mon, 18 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote: > > > > > > > > > > > It works! Thanks so much for your time Robb! I am going to poke > > > around > > > > in > > > > > > the Java files but could you get me a pointer (excuse the > > programming > > > > pun) > > > > > > in the right direction as how to pull out specific parameters from > a > > > > grib > > > > > > file? Thanks again! > > > > > > > > > > > > > > > Brandon, > > > > > > > > > > you need to look at the index file, file ending with gbx. there a > > > > > explanation of the fields, etc in the IndexFormat.txt file in the > root > > > dir > > > > > of the distribution. the important fields are: BmsOrGdsOffset > > > > > DecScale BmsExists. the last 4 fields on the product line ignoring > > the > > > -1 > > > > > field. for instance product line: > > > > > > > > > > 1 0 -1 11 107 0 255 0 2005-07-07T00:00:00Z 0 3495848078 46890 70206 > 1 > > > > > false > > > > > > > > > > then the Grib1GetData will grab the data: > > > > > java -Xmx256m ucar/grib/grib1/Grib1GetData > > data/us057g1010t04a000000000 > > > > > 46890 1 false > > > > > > > > > > will return the temperature data in K. the product name is from > the > > 11 > > > > > the 4th field from the table gwc_2.tab. > > > > > > > > > > that's the hard way to extract the data. > > > > > > > > > > we have a webstart program called netcdf tools at: > > > > > > > > > > > > > > > http://my.unidata.ucar.edu/content/software/netcdf-java/v2.2/webstart/index. > > > > html > > > > > > > > > > a quick way to view the data would be to click the viewer tab and > then > > > > > open the folder tab ( on the right side ) to select the data set to > > > open. > > > > > this tools works with netcdf, grib, and other types of data. there's > > > even > > > > > grid viewer if you select the grids tab, then open the dataset. > > there's > > > a > > > > > red icon on the right to select. the tools program is a test program > > we > > > > > use, it's not really a product. > > > > > > > > > > robb... > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > From: Robb Kambic [mailto:rkambic@xxxxxxxxxxxxxxxx] > > > > > > Sent: Friday, July 15, 2005 4:45 PM > > > > > > To: Nelson Brandon K A1C AFWA/SCSA > > > > > > Cc: decoders; support-thredds > > > > > > Subject: RE: Grib File > > > > > > > > > > > > Brandon, > > > > > > > > > > > > are you sure you got the latest GribJava.tar.gz? the latest is: > > > > > > 711461 Jul 11 14:12 GribJava.tar.gz > > > > > > > > > > > > i ran the following w/o any exceptions thrown. > > > > > > > > > > > > % java -Xmx256m ucar/grib/GribChecker data/us057g1010t04a000000000 > > > > > > % java -Xmx256m ucar/grib/grib1/Grib1Dump > > data/us057g1010t04a000000000 > > > | > > > > > > more > > > > > > % java -Xmx256m ucar/grib/grib1/Grib1Indexer > > > > data/us057g1010t04a000000000 > > > > > > | more > > > > > > > > > > > > remember the CLASSPATH must be set to find the grib.jar, > > jpeg2000.jar, > > > > and > > > > > > junit.jar. if you still get exception let me know. > > > > > > > > > > > > robb... > > > > > > > > > > > > ============================================================================== Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research rkambic@xxxxxxxxxxxxxxxx WWW: http://www.unidata.ucar.edu/ ==============================================================================
decoders archives: