[gradsusr] [EXTERNAL] Re: Not standard variable name

Thu Jul 11 08:08:43 EDT 2019

Grib data do not need aliases in the variable declaration, you can name variables anything you want – the grib codes in the levels and units fields are what matter.
Instead of
gp2e+09pv=>hgtpv2000  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential [m^2/s^2]
use
hgtpv2000  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential [m^2/s^2]
or
zspv2000  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential [m^2/s^2]
or
foo  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential [m^2/s^2]

As long as your name is lower case alphanumeric and is less than 16 characters you can call it whatever you want to.
--Jennifer

--
Jennifer Miletta Adams
ADNET Systems, Inc.
NASA/GSFC, Code 610.2
Building 32, Room S159
(301) 614-6070

From: gradsusr <gradsusr-bounces at gradsusr.org> on behalf of Jeff Duda <jeffduda319 at gmail.com>
Reply-To: GrADS Users Forum <gradsusr at gradsusr.org>
Date: Saturday, July 6, 2019 at 7:07 PM
To: GrADS Users Forum <gradsusr at gradsusr.org>
Subject: [EXTERNAL] Re: [gradsusr] Not standard variable name

You can rename variables in the control file to simpler ones that conform to naming syntax conventions. Just use the format
(grib_name)=>(new_name)
Make sure you put no spaces around the "=>"

For example, in your control file, you could do:
gp2e+09pv=>hgtpv2000  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential [m^2/s^2]
gp1p5e+09pv=>hgtpv1500  0  0,3,4  ** PV=1500 (Km^2/kg/s) surface Geopotential [m^2/s^2]

On Sat, Jul 6, 2019 at 8:10 AM iri <iri at irizone.net<mailto:iri at irizone.net>> wrote:
Hi all !

I work with the model "AROME" by Météo-France.
I download a grib2 file from
https://mf-models-on-aws.org/#arome-france/v2/2019-07-06/06/GP/pv/<https://urldefense.proofpoint.com/v2/url?u=https-3A__mf-2Dmodels-2Don-2Daws.org_-23arome-2Dfrance_v2_2019-2D07-2D06_06_GP_pv_&d=DwMFaQ&c=ApwzowJNAKKw3xye91w7BE1XMRKi2LN9kiMk5Csz9Zk&r=M2mFZsxo0ZoztoK2Lyoypu1kKkBVKyEoM9CXGWO42zk&m=PMweNxqkkZEIaLkbguPaXqXH5sUpkaVBZ4a-cn3AuqA&s=VUWr-WLBOWh-EbeRzwaBVqk6rUEbKJNAX5PHAql5W9k&e=> to
get PVU (1.5 and 2).

$ wgrib2 arome-france_20190706_06_GP_pv_17h.grib2
1:0:d=2019070606:GP:PV=2000 (Km^2/kg/s) surface:17 hour fcst:
2:221788:d=2019070606:GP:PV=1500 (Km^2/kg/s) surface:17 hour fcst:

$ g2ctl file.grib2 > pvu.ctl

ga-> open pvu.ctl

ga-> q file
File 1 : arome-france_20190706_06_GP_pv_17h.grib2
  Descriptor: pvu.ctl
  Binary: arome-france_20190706_06_GP_pv_17h.grib2
  Type = Gridded
  Xsize = 801  Ysize = 601  Zsize = 1  Tsize = 1  Esize = 1
  Number of Variables = 2
     gp2e+09pv  0  0,3,4  ** PV=2000 (Km^2/kg/s) surface Geopotential
[m^2/s^2]
     gp1p5e+09pv  0  0,3,4  ** PV=1500 (Km^2/kg/s) surface Geopotential
[m^2/s^2]

ga-> d gp2e+09pv
Syntax Error:  Invalid Operand
  'gp2e' not a variable or function name
  Error ocurred at column 1
DISPLAY error:  Invalid expression
  Expression = gp2e+09pv

I tried with wgrib2 -set_var, it changes only GP to HGT and the final
name in ctl becomes hgt2e+09pv
It is a logical result.

I tested with alt_g2ctl and -short option. In this case :

ga-> open pvu2.ctl
Scanning description file:  pvu2.ctl
Data file arome-france_20190706_06_GP_pv_17h.grib2 is open as file 1
LON set to -8 12
LAT set to 38 53
LEV set to 1 1
Time values set: 2019:7:6:23 2019:7:6:23
E set to 1 1

ga-> q file
File 1 : arome-france_20190706_06_GP_pv_17h.grib2
  Descriptor: pvu2.ctl
  Binary: arome-france_20190706_06_GP_pv_17h.grib2
  Type = Gridded
  Xsize = 801  Ysize = 601  Zsize = 1  Tsize = 1  Esize = 1
  Number of Variables = 2
     v1  0  0  "GP:PV=1500 (Km^2/kg/s) surface"
     v2  0  0  "GP:PV=2000 (Km^2/kg/s) surface"

ga-> d v1
Cannot contour grid - all undefined values

How can i rename gp1p5e+09pv to gp1p5e by example ?

Thank you for your help in advance.

Stephane Iri
InC + PE13
Marseille, France

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--
Jeff Duda, Research Scientist
University of Colorado Boulder
Cooperative Institute for Research in Environmental Sciences
NOAA/OAR/ESRL/Global Systems Division
Boulder, CO
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