Creating Data Files

[Charles Seman]

Kate,

The GrADS web site
http://grads.iges.org/grads/gadoc/aboutgriddeddata.html#structure
discusses the structure of a GrADS gridded binary data file, and
http://grads.iges.org/grads/gadoc/aboutgriddeddata.html#create
has some examples of how to create GrADS gridded binary data files.

Hope this helps,
Chuck

Kate Looney wrote:

>Good Afternoon-
>
>I'm interested in creating a gridded binary data file of a bunch of u and v
>components.  Both time and height are constants, so I'm only concerned with
>latitude and longitude variation.  I've checked the Grads website
>documentation on how to do this, but still have a few questions:
>
>Here is my sample control file:
>
> dset gridded_data_sample.dat
> title Gridded Data Sample
> undef -9.99e33
> xdef 3 linear 0 2.5
> ydef 3 linear -90 2.0
> zdef 1 levels 1000
> tdef 1 linear 00Z19Oct2005 3hr
> vars 2
> u 0 99 U component
> v 0 99 V component
> endvars
>
>1) Assuming I have a 3x3 grid, is this control file correct?
>2) What should my gridded_data_sample.dat file look like? My best guess at
>this point is that it should have 2 rows.  The first row contains all u
>vector components and there should be 9 entries.  The second row contains
>all v vector components and there should be 9 entries.
>3) How should I format the data? i.e. how much spacing (if any) is there
>between each entry in the sample file?
>
>A sample data file that grads can read would be a huge help if anyone has
>one.  Thanks for any help in advance.
>
>Regards,
>Kate Looney
>
>

--

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 Charles Seman                                charles.seman at noaa.gov
 U.S. Department of Commerce / NOAA / OAR
 Geophysical Fluid Dynamics Laboratory         voice: (609) 452-6547
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