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20041203: 20041203: 20041202: 20041201: GEMPAK trouble with non-standard domain

Brian,

The problem you are having is the LoV (central longitude) is in a different 
hemisphere than the Lo1 (lower left longitude). This is a general limitation of
the gblamb.c routine I mentioned, so you will have the same problem using
the GEMPAK program NAGRIB.

From your previous mention of asking about source code, I'm assuming
you had downloaded a binary distribution, so I've posted a Linux binary at
http://my.unidata.ucar.edu/content/software/gempak/download/patches/binary/linux/dcgrib2
If you need a different platform, let me know.

Steve Chiswell
Unidata User Support



>From: Brian Jamison <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200412031924.iB3JOalI013936

>Hi Steve,
>
>I'll take you up on your offer.  I tried to email the grib file,
>but I'm limited to 25MB on outgoing mail.  So I put the file
>on a web page:
>
>http://www-frd.fsl.noaa.gov/mab/jamison/steve/
>
>Just right-click and download.  Let me know if you have any
>trouble.
>
>Thanks so much for helping me with this!
>
>
>Brian
>
>
>On Dec 3, 2004, at 11:26 AM, Unidata Support wrote:
>
>>
>> Brian,
>>
>> The Lambert projection code is part of the GEMPAK libraries,
>> and not specific to dcgrib2. The routine is
>> $GEMPAK/source/gemlib/gb/gblamb.c
>> which is available in the source code distribution.
>>
>> The dcgrib2 program is in the source distribution under
>> $NAWIPS/unidata/ldmbridge/dcgrib2.
>>
>> If you want to send me a single (or small) example of
>> your grib, I can pass it through the debugger and see where
>> things are getting fouled.
>>
>> Steve Chiswell
>> Unidata User Support
>>
>>
>>
>>> From: Brian Jamison <address@hidden>
>>> Organization: UCAR/Unidata
>>> Keywords: 200412031643.iB3GhWlI024668
>>
>>> Hi Steve,
>>>
>>>> Brian,
>>>>
>>>> Since this is not grid #252, that value should be set to 255
>>>> just for correctness, but since the dcgrib2 decoder will use the GDS
>>>> when present, that shouldn't be your problem here.
>>>>
>>>> One possibility is that the Lo1 angle is not in the range 0 to 360,
>>>> eg your wgrib output shows 520. Can you change this to a more
>>>> conventional 260? That way, the (Lo1 - Lov) difference in
>>>> computing the upper right point should be in the correct distance.
>>>
>>> I don't know of an easy way to "edit" a grib file to change this
>>> value.  I wasn't the person that created these grib files, so it's
>>> not easy for me to re-create them with this change, either.
>>>
>>> Would it be possible to get the code for creating the dcgrib2
>>> executable, so I can make the changes to handle the 520
>>> value?
>>>
>>>
>>> Brian
>>>
>>>
>> --
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