[gradsusr] 'tas' Plotting Error

[Adam Cinderich]

Jeff,

 

Thank you.  I did a 'q file' and it says 1 variable.  The variable was
correct, but looking over my .ctl file once more, I realized the problem was
within the .ctl file and it now plots.

 

However, I do have another question.  I plotted tas for my domain (The Great
Lakes Region) 41-49 and 267-285 and it does not look correct.  I believe it
has to do with my 'pdef' line in the .ctl file (I have been trying to come
up with the correct pdef lines for the NARCCAP models and haven't been
successful yet). 

 

I came up with the following pdef line: pdef   123  104  NPS  78.5  166.5
263  50  50

based on the ncdump information for the ECPC model and GrADS pdef syntax
requirements:

        xc = 123 ;

        yc = 104 ;

        time = UNLIMITED ; // (731 currently)

        bnds = 2 ;

variables:

        char polar_stereographic ;

                polar_stereographic:grid_mapping_name =
"polar_stereographic" ;

                polar_stereographic:longitude_of_central_meridian = 263. ;

                polar_stereographic:straight_vertical_longitude_from_pole =
263. ;

                polar_stereographic:standard_parallel = 60. ;

                polar_stereographic:TrueGridLength_Latitude = 60. ;

                polar_stereographic:XGridLength_M = 50000. ;

                polar_stereographic:YGridLength_M = 50000. ;

                polar_stereographic:PoleOnPlane = "north" ;

                polar_stereographic:false_easting = 3925000. ;

                polar_stereographic:false_northing = 8325000. ;

                polar_stereographic:latitude_of_projection_origin = 90. ;

 

Are you, or is anyone else, able to offer a suggestion on what might be
wrong (and how to correct) my pdef line?

 

Thank you,

Adam

 

 

From: gradsusr-bounces at gradsusr.org [mailto:gradsusr-bounces at gradsusr.org]
On Behalf Of Jeffrey Duda
Sent: Monday, February 14, 2011 4:23 PM
To: GrADS Users Forum
Subject: Re: [gradsusr] 'tas' Plotting Error

 

Adam,
Do "q file" to see if the variable tas shows up in the list of variables.
It might also be a matter of capitalization.  Grads is case sensitive in
this way.

Jeff Duda

On Mon, Feb 14, 2011 at 3:20 PM, Adam Cinderich < <mailto:cinderic at msu.edu>
cinderic at msu.edu> wrote:

Hello:

 

I am trying to plot using open Grads.  I have opened my .ctl file and it
says that my data file was opened.  However, when I attempt to plot 'tas' it
says the following:

 

Syntax Error: Invalid Operand

   'tas' not a variable or function name

   Error occurred at column 1

DISPLAY error:  Invalid expression

   Expression = tas

 

'tas' is my temperature at surface variable and when I do an ncdump of the
data file, it shows 'tas' as the variable.  Can someone offer any
suggestions as to why it won't let me plot my variable and/or tell me if a
command exists for Grads that will list variables that are available to be
plotted?

 

Thank you,

Adam


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-- 
Jeff Duda
Iowa State University
Meteorology Graduate Student
3134 Agronomy Hall
 <http://www.meteor.iastate.edu/~jdduda> www.meteor.iastate.edu/~jdduda

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