[gradsusr] xdfopen cdf file dimension problem/question

[Jennifer Adams]

Use these entries in your descriptor instead:

XDEF time 1 levels -98
YDEF time 1 levels 35

It doesn't matter what dimension name you use if you provide all the  
axis metadata in your descriptor file.
--Jennifer

On Aug 29, 2010, at 9:39 PM, Thomas W. Collow wrote:

> Jim
>
> Thanks for the response.  Actually there is no lat and lon dimension  
> specified in the header.   The only dimensions are depth and time.   
> Here is some of the ncdump output.  I don't know if what I'm trying  
> to do is possible with only the two provided dimensions.
>
> ncdump -c file.cdf
> netcdf file {
> dimensions:
>        time = UNLIMITED ; // (24 currently)
>        depth = 8 ;
> variables:
>        int base_time ;
>                base_time:string = "31-Jul-2010,18:07:00 GMT" ;
>                base_time:long_name = "Base time in Epoch" ;
>                base_time:units = "seconds since 1970-1-1 0:00:00  
> 0:00" ;
>
> and so on (there are several variables including the two I'm  
> interested in, watcont_W and watcont_E)
>
> Thanks for your help
>
> Tom
>
>
>
> -----Original Message-----
>
>> Date: Sat Aug 28 15:51:15 EDT 2010
>> From: "James T. Potemra" <jimp at hawaii.edu>
>> Subject: Re: [gradsusr] xdfopen cdf file dimension problem/question
>> To: "GrADS Users Forum" <gradsusr at gradsusr.org>
>>
>> Tom:
>>
>> Make sure that the dimensions in your netcdf file are actually  
>> "lon" and
>> "lat".  If not (e.g., they are latitude and longitude) you'll need to
>> put that in the CTL file as XDEF/YDEF.  Maybe providing the output  
>> from
>> "ncdump" on your cdf file would help see what's going on.
>>
>> Jim
>>
>> Thomas W. Collow wrote:
>>> Hello, I am having an issue with displaying a .cdf file using  
>>> GrADS.  To keep it simple I will refer to the file as ?file.cdf.?  
>>> The file is a time series of soil water content at different depths.
>>>
>>> The header of the file contains only two dimensions, depth and  
>>> time.  I want to read this file using GrADS.
>>> This is what happens when I use sdfopen:
>>>
>>> ga->sdfopen  file.cdf
>>> Scanning self-describing file file.cdf
>>> SDF file has no discernable X coordinate.
>>>
>>> My next approach is to use xdfopen and create a control file using  
>>> information in the header and to specify the latitude and  
>>> longitude.   Here is my control file, call it ?control?
>>>
>>> DSET file.cdf
>>> TITLE Data
>>> UNDEF -9999
>>> XDEF lon 01 levels -98
>>> YDEF lat 01 levels 35
>>> TDEF time 24 18:07Z31jul2010 1hr
>>> ZDEF depth 8 levels 5 15 25 35 60 85 125 175
>>> VARS 2
>>> watcont_W=>smw 8 99 water content west
>>> watcont_E=>sme 8 99 water content east
>>> ENDVARS
>>>
>>> Now I do xdfopen control and get this error
>>>
>>> ga-> xdfopen control
>>> Scanning Descriptor File:  control
>>> Alleged lon dimension (from YDEF) is not an SDF dimension.  Cannot  
>>> continue.
>>> Lon dimension name is:
>>> lat
>>> .
>>> Alleged lat dimension (from XDEF) is not an SDF dimension.  Cannot  
>>> continue.
>>> Lat dimension name is:
>>> lon
>>> .
>>> SDF file file.cdf was not successfully opened & parsed.
>>>
>>> I am trying to specify a specific latitude and longitude since I  
>>> know what it is.  It is just not a dimension in the cdf file  
>>> header.  Any suggestions on how I can fix this problem or is this  
>>> file not able to be read by GrADS?
>>>
>>> Thanks
>>> Tom
>>> _______________________________________________
>>> gradsusr mailing list
>>> gradsusr at gradsusr.org
>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>
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--
Jennifer M. Adams
IGES/COLA
4041 Powder Mill Road, Suite 302
Calverton, MD 20705
jma at cola.iges.org



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