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RE: Grib File
- Subject: RE: Grib File
- Date: Sat, 30 Jul 2005 08:32:45 -0600 (MDT)
On Fri, 29 Jul 2005, Nelson Brandon K A1C AFWA/SCSA wrote:
> I guess I am still misunderstanding sorry and thank you so much for your
> patience!
>
> How are you getting cetegory equals 0 when the place where it is is -1?
sorry a typo, catagory does = -1. i was cutting and pasting too quickly.
Grib2 products have a category but Grib1 does not so it's set to -1. the
aim was trying to make the Grib1 and Grib2 indexes have the same
fields/number. didn't work out exactly as planned.
>
> also this confuses me more...
> "-l =23398 //this is probably what confused you, it's the endOfRecord
> offset"
as i write this, i'm changing the IndexFormat.txt to be correct. the -1 is
now endOfRecord. by endOfRecord, that's the offset of the end of record
in this file.
i made the changes and created a new tar file GribJava.tar.gz. you might
want to get it because it has code changes too.
robb...
>
> Thanks again Robb!
>
> -----Original Message-----
> From: Robb Kambic
> To: Nelson Brandon K A1C AFWA/SCSA
> Cc: decoders; support-thredds
> Sent: 7/29/2005 5:35 PM
> Subject: RE: Grib File
>
> 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:address@hidden]
> > 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:address@hidden]
> > > 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:address@hidden]
> > > > 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:address@hidden]
> > > > > 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/in
> dex.
> > > > > 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:address@hidden]
> > > > > > > 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
> > > > > > > address@hidden WWW:
> > > http://www.unidata.ucar.edu/
> > > > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > > > > ===
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > > ===
> > > > > > Robb Kambic Unidata Program
> Center
> > > > > > Software Engineer III Univ. Corp for
> > > > Atmospheric
> > > > > Research
> > > > > > address@hidden WWW:
> > http://www.unidata.ucar.edu/
> > > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > > ===
> > > > > >
> > > > >
> > > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > > ===
> > > > > Robb Kambic Unidata Program
> Center
> > > > > Software Engineer III Univ. Corp for
> > > Atmospheric
> > > > > Research
> > > > > address@hidden WWW:
> http://www.unidata.ucar.edu/
> > > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > > ===
> > > > >
> > > > >
> > > >
> > > >
> > >
> >
> ========================================================================
> ====
> > > > ===
> > > > Robb Kambic Unidata Program
> Center
> > > > Software Engineer III Univ. Corp for
> > Atmospheric
> > > > Research
> > > > address@hidden WWW:
> http://www.unidata.ucar.edu/
> > > >
> > >
> >
> ========================================================================
> ====
> > > > ===
> > > >
> > >
> > >
> >
> ========================================================================
> ====
> > > ===
> > > Robb Kambic Unidata Program Center
> > > Software Engineer III Univ. Corp for
> Atmospheric
> > > Research
> > > address@hidden WWW:
> http://www.unidata.ucar.edu/
> > >
> >
> ========================================================================
> ====
> > > ===
> > >
> >
> >
> ========================================================================
> ====
> > ===
> > Robb Kambic Unidata Program Center
> > Software Engineer III Univ. Corp for Atmospheric
> > Research
> > address@hidden WWW:
> http://www.unidata.ucar.edu/
> >
> ========================================================================
> ====
> > ===
> >
>
> ========================================================================
> =======
> Robb Kambic Unidata Program Center
> Software Engineer III Univ. Corp for Atmospheric
> Research
> address@hidden WWW:
> http://www.unidata.ucar.edu/
> ========================================================================
> =======
>
===============================================================================
Robb Kambic Unidata Program Center
Software Engineer III Univ. Corp for Atmospheric Research
address@hidden WWW: http://www.unidata.ucar.edu/
===============================================================================