help me the IPCC AR4 dada

[Baolin Zhang]

Dear Heiner,

Thank you for your reply.
Grads is new to me. I made the .ctl by myself, according to wgrib.
I used wgrib a.grb, the last line is:
1812:10894976:d=00121612:APCP:kpds5=61:kpds6=1:kpds7=0:TR=10:P1=0:P2=0:TimeU=0:sfc:anl:NAve=0
Using wgrin -V, I can find the last record as follow:
rec 1812:10894976:date 2100121612 APCP kpds5=61 kpds6=1 kpds7=0 levels=(0,0)
grid=255 sfc anl:
ACPC=total precipitation
timerange 10 P1 0 P2 0 TimeU0 nx 57 nny 52 GDS grid 4 num_in_ave 0 missing 0
center 0 subcenter 0 process 0 Table 0
gaussian: lat -56.890000 to 38.238000
             long -33.750000 to 71.250000 by 1.875000, (57X52) scan 0 mode
128 bdsgrid 1
min/max data 0 8.88966e-05 num bits 16 BDS_Ref 0 DecScale 0 BinScale -29

So, I made a .ctl file like this:
dset ^a.grb
dtype grib
 index ^a.grb.gmp
 undef -9.99E+33
 title a.grb
 xdef 57 linear -56.890000 1.875000
 ydef 52 linear -33.750000 1.875000
 zdef 1 levels 1 1
 tdef 1812 linear jan1950 1mon
 vars 1
 APCP 0 99 total precipitation
 endvars
But it does not work.
Any suggestion?

Thank you very much


Baolin Zhang

Arid Land Research Center
Tottori University



----- Original Message -----
From: "Heiner Körnich" <heiner at MISU.SU.SE>
To: <GRADSUSR at LIST.CINECA.IT>
Sent: Thursday, November 15, 2007 9:48 PM
Subject: Re: help me the IPCC AR4 dada


> Hi,
>
> have you run "gribmap" over the ctl-file?
> The entry for index is a bit strange. It should be ^ instead of ~.
>
> Regards,
> Heiner
>
> On Thu, 2007-11-15 at 20:11 +0900, Baolin Zhang wrote:
>> Dear all
>> I want to open IPCC AR4 precipitation data over Africa.
>>
>> I try the follow:
>> dset ^a.grb
>> dtype grib
>> index ~a.grb.gmp
>> undef -9.99E+33
>> title a.grb
>> xdef 57 linear -56.890000 1.875000
>> ydef 52 linear -33.750000 1.875000
>> zdef 1 levels 1 1
>> tdef 1812 linear jan1950 1mon
>> vars 1
>> APCP 0 99 total precipitation
>> endvars
>>
>> But the result is: all grid undefined.
>>
>> Anyone knows the format? I am not sure about the bold lines.
>> I used wgrib a.grb, the last line is:
>> 1812:10894976:d=00121612:APCP:kpds5=61:kpds6=1:kpds7=0:TR=10:P1=0:P2=0:TimeU=0:sfc:anl:NAve=0
>> Any suggestions?
>>
>> Thank you
>>
>> Best regards
>>
>>
>> Baolin Zhang
> --
> Heiner Körnich
> Dept. of Meteorology            Tel:  +46 8 164333
> Stockholms University, SE-106 91 Stockholm, Sweden
> Email: heiner at misu.su.se   www.misu.su.se/~heiner/
>
>