[gradsusr] problem regarding opening data descriptor file in grads

[Jennifer Adams]

On Nov 27, 2013, at 7:07 AM, asmat ullah wrote:

> hi,
> i am using GFDL CM2.0...i have download the data form LAS portal of GFDL. i have run the .nc file than this error has been occurred as under..
> 
> SDF Error: 365 day calendars are no longer supported by sdfopen.
> To open this file with grads us a descriptor file with a complete TDEF entry and Options 365 day calendar……


> 
> than i use xconv and convert nc file in grads readable. this software give the output in two file one was .ctl file and .dat file. these file were not open properly when i gave the path in script of .ctl file by applying xdfopen, the error was as under….
If you have a binary file and a descriptor file, then use 'open' not 'xdfopen'. 


> gadxdf error: invalid options keyword
> The invalid description file record is:
> options little_endian
> The data file was not opened.
> 
> In .ctl file the script was as under
> dset ^cm112.dat
> undef 200000004008175470000.000000
This is a strange undef value. Should it be 2e20? 
> options little_endian
You only need this option if the endianness of the file is different from the endianness of the system on which you are reading it. Based on the error message you got from sdfopen, you should probably have a 365_day_calendar option here. 
> *
> xdef 2 linear 1.000000 1.000000
> *
> ydef 1 linear 1 1
> *
> zdef 1 linear 1 1
> *
> tdef 264 linear 01:-3Z55 708dyhr
This TDEF entry is undecipherable. Make sure you put the start time in the right format, something like 12z15jan2001. And the increment can have only one unit. Please see http://iges.org/grads/gadoc/descriptorfile.html#TDEF

> *
> vars 2
> TIME_bnds 0 99 TIME_bnds
> PR 0 99 Precipitation [kg m-2 s-1]
GrADS wants lower case variable names. Change these to pr and time_bnds. 
--Jennifer

> endvars
> 
> 
> Please let me knw ho can i open .dat and .ctl files in grads, and how to operate .dat file in grads. 
> 
> Regards
> ASMAT ULLAH
> 
> 
> 
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--
Jennifer M. Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
111 Research Hall, Mail Stop 2B3
George Mason University
4400 University Drive
Fairfax, VA 22030 





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