[gradsusr] plotting time in hovmoller pictures

[Charles Seman]

Liping Liu,

You might also be able to use GrADS templates to "concatenate" the "olr" 
fields from file 1 and file 2 into a single time series within GrADS as 
follows:

'open olr_template.ctl'
'set yflip on'
'set lev 1000'
'set tlsupp year'
'set t 2 80'
'set lat 15'
'set gxout shaded'
'set grads off'
'd ave(olr,lat=5,lat=25)'

where "olr" is the name of the variable in the "vars" section of the 
GrADS template data descriptor file "olr_template.ctl" (please see the 
examples at http://grads.iges.org/grads/gadoc/templates.html which can 
give you some ideas for what your "olr_template.ctl" might need)... 
briefly, a template data descriptor file for  time differs from a single 
dataset data descriptor file in the "dset" record, a required "options 
template" record, and in the "tdef" record (in which the number of time 
levels in the template data descriptor file is the sum of the time 
levels for each of the component datasets).

I hope this helps,
Chuck

Liping Liu wrote:
> Hi,   (I am a new user of GrADs)
>
> I am trying to plot two hovmollers into one figure. The problem is the 
> time.
> First I plot the hovmollers using data from file 1 for Aug10 to Aug15, 
> with the following commands:
>
> 'set yflip on'
> 'set lev 1000'
> 'set tlsupp year'
> 'set t 2 48'
> 'set lat 15'
> 'set gxout shaded'
> 'set grads off'
> 'd ave(olr.1,lat=5,lat=25)'
>
> So it gives me a figure for Aug10--Aug15. But, when I repeat the 
> plotting for another period of time Aug15-Aug20: 
>
> 'set t 49 80'
> 'd ave(olr.2,lat=5,lat=25)'
>
> It will simply overlap the whole figure, the time is not sequenced.
>
> Question: what do I do to get the pictures of Aug10-15 and Aug15-20 
> laid out vertically (not overlapping each other)?
>
> An alternative way is to write the two sets of data into one data 
> file. But I don't know how to do that either.
>
> Thanks for your help. Suggestions to either of the approaches are 
> greatly appreciated!
>
> Liping
>  
>
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-- 

Please note that Charles.Seman at noaa.gov should be considered my NOAA
email address, not cjs at gfdl.noaa.gov.

********************************************************************
 Charles Seman                                Charles.Seman at noaa.gov
 U.S. Department of Commerce / NOAA / OAR
 Geophysical Fluid Dynamics Laboratory         voice: (609) 452-6547
 201 Forrestal Road                              fax: (609) 987-5063
 Princeton, NJ  08540-6649            http://www.gfdl.noaa.gov/~cjs/
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