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

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  • Subject: 20041203: 20041202: 20041201: GEMPAK trouble with non-standard domain
  • Date: Fri, 03 Dec 2004 11:26:43 -0700
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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