[gradsusr] Station data control file

[Jennifer Adams]

GrADS needs to set the dimension environment to *something* when it opens a station data set, so it uses those defaults. The stnmap file doesn’t tell GrADS anything about the domain of the data — GrADS has no idea where the data are located until you invoke display and launch an I/O request. After you open the file, you can change the dimension environment to the smaller domain (since you know what it is ahead of time), then do a display. 
—Jennifer


On Jul 7, 2015, at 1:02 PM, Clement Agboma <aclems at gmail.com> wrote:

> You are right in terms of XDEF, YDEF, and ZDEF being used in station
> control file. However, even by removing these from the control file,
> my station data domain still read as:
> 
> LON set to 0 360
> LAT set to -90 90
> LEV set to 500 500
> Time values set: 2006:1:1:0 2006:1:1:0
> E set to 1 1
> 
> This is a global data coverage  but  my data only spans a small
> watershed with coordinates provided earlier on. It is really confusing
> why this is happening within GrADS.  Has anyone faced similar issue?
> 
> Clement.
> 
> On 7/7/15, M.Mahakur <mmahakur at tropmet.res.in> wrote:
>> 
>> You need to correct your .ctl file, No need to specify lon-lat coordinates
>> in the GrADS DDF.
>> 
>> Please see the documenation.
>> 
>> XDEF, YDEF, and ZDEF These entries are not included in a station data
>> control file
>> 
>> (http://www.iges.org/grads/gadoc/aboutstationdata.html)
>> 
>> ----- Original Message -----
>> From: Clement Agboma <aclems at gmail.com>
>> To: gradsusr at gradsusr.org
>> Sent: Tue, 07 Jul 2015 19:46:26 +0530 (IST)
>> Subject: [gradsusr] Station data control file
>> 
>> Hello All,
>> 
>> I am having lots of issues reading station data with a control file that I
>> had used  multiple times in the past to open and view meteorological
>> variable. I have a fortran program that generates a binary file and I use
>> the stnmap utility to create the required  map file for inclusion in the
>> station control file. My control file is attached.
>> 
>> When I try to open the file in grads, and I use the "q dim" command, it
>> gives a global coverage for my data domain as follows:
>> 
>> ga-> q dim
>> Default file number is: 1
>> X is varying   Lon = 0 to 360   X = 0 to 360
>> Y is varying   Lat = -90 to 90   Y = -90 to 90
>> Z is fixed     Lev = 500  Z = 500
>> T is fixed     Time = 00Z01JAN2006  T = 1
>> 
>> 
>> My actual station data domain is:
>> 
>> xdef 9 linear -103.7 0.3
>> ydef 5 linear 51.8 0.3
>> zdef 1 linear 1 1
>> tdef 3287 linear 00Z01jan2006 1dy
>> 
>> I have tried to use stnmap -1 -i  (my_control_file) as well as stnmap  -i
>> (my_control_file) to generate stnmap files for use in grads versions  1.94
>> and 2.0.2 but the problem persist.
>> 
>> Please can someone assist because I never had this problem in the past
>> using this same control file.  A few people equally had this problem a
>> while back but I didn't see any solution provided.
>> 
>> Thanks,
>> 
>> Clement Agboma (PhD, PGeo).
>> 
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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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