[gradsusr] Unable To Open Concatanated Regional GEM GRIB2s WithGrADS

Tue Mar 25 19:11:16 EDT 2014

The link you provided was to the 10km data .. but the grid descriptor
file you link to below is for a 15km file.  Are you sure there is not
some finger-problem somewhere?

I downloaded a 10km file for a test .. ran it through g2ctl/gribmap ..
and grads could display it AOK. 

Not unexpectedly, though.. the pdef, xdef, ydef are different than yours

dset ^CMC_reg_TMP_TGL_2_ps10km_2014032512_P003.grib2

index ^CMC_reg_TMP_TGL_2_ps10km_2014032512_P003.grib2.idx

undef 9.999E+20

title CMC_reg_TMP_TGL_2_ps10km_2014032512_P003.grib2

* produced by g2ctl v0.0.8.8

* command line options: CMC_reg_TMP_TGL_2_ps10km_2014032512_P003.grib2

* griddef=1:0:(935 x 824):grid_template=20:winds(grid): polar
stereographic grid: (935 x 824) input WE:SN output WE:SN res 8 North
pole lat1 18.145030 lon1 217.107456 latD 60.000000 lonV 249.000000 dx
10000.000000 m dy 10000.000000 m:winds(grid)

dtype grib2

pdef 935 824 nps 456.142068646443 732.42845661651 249.000000 10

xdef 4000 linear 0.000000 0.0899775056235941

ydef 808 linear 17.342726 0.0900337967781908

Ron

On Tue, Mar 25, 2014 at 3:11 PM, Perry, Aaron @ LSC
<Aaron.Perry at lsc.vsc.edu> wrote:

I should also mention that I was displaying the UGRD10m with 'd
UGRD10m.1' to make sure that GrADS was looking at the correct control
file. After fixing this, from UGRD10m.2 to UGRD10m.1, I'm now getting
the Request is completely outside file limits/cannot contour grid error.

Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA 
Twitter: @AaronPerryLSC <https://twitter.com/AaronPerryLSC> 
Mobile: 617-780-4312

________________________________

From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on
behalf of Perry, Aaron @ LSC [Aaron.Perry at lsc.vsc.edu]
Sent: Tuesday, March 25, 2014 4:05 PM
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s
With GrADS

Greg,

I still got the data request warning error when taking the ABSV variable
out of the big GRIB2 file so, I tried just downloading UGRD10m and
VGRD10m separately and NOT cat'ing them together and then running
g2ctl/gribmap on each and now I getting a separate "Data Request Error:
File number out of range" warning for both UGRD10m and VGRD10m when I
try to open them separately in GrADS.

Here's the grid descriptor file text: http://paste2.org/LgGwD89f

(scratches head)

Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA 
Twitter: @AaronPerryLSC <https://twitter.com/AaronPerryLSC> 
Mobile: 617-780-4312

________________________________

From: Perry, Aaron @ LSC
Sent: Tuesday, March 25, 2014 1:57 PM
To: GrADS Users Forum
Subject: RE: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s
With GrADS

Hi Greg,

I'm going to try leaving out ABSV and then cat the rest of the GRIB2s
like I usually do and see what that does.

Thanks again for all the help!

I'll let you know how it goes...

Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA 
Twitter: @AaronPerryLSC <https://twitter.com/AaronPerryLSC> 
Mobile: 617-780-4312

________________________________

From: gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] on
behalf of Greg West [gwest at eos.ubc.ca]
Sent: Tuesday, March 25, 2014 1:15 PM
To: gradsusr at gradsusr.org
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM GRIB2s
With GrADS

Aaron, 

>From your script it looks like you're grabbing the 15km GEM. The 15km
used to give me the same problem though. If you run g2ctl.pl on the
concatenated grib2 file, it will give you one grid description. The
problem is that I believe that's just based on the first field it
encounters, and there might be another field in the concatenated file
that's on a different grid. I think I download all of those fields
except ABSV, and since that's a derived field, I would suspect it might
be the one on a different grid. I would recommend downloading your usual
files, but leaving them in their separate grib2 files (1 field per
file). Then pick a forecast time and run each file through g2ctl.pl and
see what grid description it gives you. The ctl file generated for the
ABSV file might be different from the others.

If ABSV is the problem field, an alternative to making a separate ctl
file just for that field would be to not download it, and instead
calculate it from the u and v winds.

Greg

____________________________
Greg West, PhD 

Postdoctoral Fellow
Weather Forecast Research Team
University of British Columbia
EOS-Main 224
GWest at eos.ubc.ca
--
Meteorologist
Hydrology & Technical Services
BC Hydro
Greg.West at bchydro.com

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Message: 3
Date: Mon, 24 Mar 2014 22:49:45 +0000
From: "Perry, Aaron @ LSC" <Aaron.Perry at lsc.vsc.edu
<mailto:Aaron.Perry at lsc.vsc.edu> >
Subject: Re: [gradsusr] Unable To Open Concatanated Regional GEM
        GRIB2s  With    GrADS
To: GrADS Users Forum <gradsusr at gradsusr.org
<mailto:gradsusr at gradsusr.org> >
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<DEE427CC71C1184E9F7C903BF1EEE7A80B65D4BC at LSC-EX10MBX03.lsc.vsc.edu
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Hi Greg,

Thank you very much for chiming in! I've been using the usual
http://dd.weatheroffice.gc.ca/model_gem_regional/10km/grib2/
<http://dd.weatheroffice.gc.ca/model_gem_regional/10km/grib2/>
datasource to
pull the GRIB2s and then run them through g2ctl/gribmap.

Truly stumped right now...

Onward and Upward,

Aaron D. Perry
Atmospheric Sciences
Lyndon State College
Class of 2016
Boston, MA
Twitter: @AaronPerryLSC<https://twitter.com/AaronPerryLSC
<https://twitter.com/AaronPerryLSC> >
Mobile: 617-780-4312 <tel:617-780-4312> 

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