Problems plotting seaice preprojected data (southern hemisphere)

[Jean Pierre Arabonis]

Hi there

    I plot a similar dataset put out by mmab with no problems at all,
you plot looks similar to our data and I surmise it must be similar.
    my ctl file is below, also while obvious you need to set mproj sps
or it won't work


dset ^SICEpsg.20080125.grb
index ^SICEpsg.20080125.grb.idx
undef 9.999E+20
title SICEpsg.20080125.grb
dtype grib 171
pdef 690 710 sps 300.675328651061 360.60492071694 -260.000000 -12.7
xdef 1576 linear 0 0.228426395939086
ydef 233 linear -90 0.228426395939086
tdef 1 linear 00Z25jan2008 1mo
zdef 1 linear 1 1
vars 1
ICECmsl  0 91,102,0  ** Ice concentration (ice=1;no ice=0) [fraction]
ENDVARS
arabonis at b

Looking at your ctl file you probably need to change the "pse to "sps" i
your PDEF line.

hope this helps

    JP



Christopher Cunningham wrote:
> Hi GrADS users,
>
> I am having problems to display the Antartica sea ice concentration
> made available by the NSIDC. I am using the GrADS for PC, version
> 1.8SL11, and my control file is like the one below
>
> DSET C:\dados\diarios\seaice\nt_19790104_f07_v01_s.bin.grads
> PDEF 332 316 pse 90. 0. 173 158 25. 25. -1
> UNDEF -1.0E+1
> TITLE TEMP
> XDEF 360 LINEAR    00.0  1.0
> YDEF 180 LINEAR   -90.0  0.5
> ZDEF 1 LEVELS 1
> TDEF 1 LINEAR 02JAN1979 2dy
> VARS 1
> si 0 99 Sea Ice Coverage [ % ]
> ENDVARS
> If I use the PDEF above I get the Antartic data plotted in the
> Northern Hemisphere, even though I used -1 which is the parameter for
> S polar stereo. In fact to change this parameter has no effect at all.
> I have also tried several combinations of numbers as arguments for the
> PDEF statement, but none works to plot the Antartic in the South Pole.
>
> Have someone experienced this kind of difficulty?
>
>
> Abra sua conta no Yahoo! Mail
> <http://br.rd.yahoo.com/mail/taglines/mail/*http://br.mail.yahoo.com/>,
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> ------------------------------------------------------------------------
>


--
Jean Pierre Arabonis
arabonis at egs.uct.ac.za
Tel 021 780 1021 cell 084 401 1365
This email is 100% Microsoft Free

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