[gradsusr] Help new to grads

gibies george gibiesgeorge at gmail.com
Thu May 6 04:34:45 EDT 2010


Bob,

Please see the page http://www.iges.org/grads/gadoc/users . It is GrADS
User's Guide <http://www.iges.org/grads/gadoc/users.html> which tell you
about all details about GrADS.



On 6 May 2010 13:18, bob duker <dukerbob at gmail.com> wrote:

> Thanks for your response Dr. Huddleston,
> I just downloaded opengrads2.0.  I have found all the files you mention,
> but i have trouble following the rest. I'm new to grads and computer
> programming. It would help me out a lot to learn some of the basics of using
> grads. For example,
>
> 'gfortran -o readsnow readsnow.f'
> does grads have a compiler in it or is this something i need to download
> seperately? Is there a tutorial for grads basic functions that could help me
> learn more.
>
> Also I'm not sure what "Uncomment the open(unit=93 line and edit it to read
> the file wk2010 in your local path" means.
>
> I know that most grads users have far better understanding of this kind of
> stuff then me, but the grads webpage says
> "Users at all levels are encouraged to post questions and answers on the
> basics of getting started".
>
> Thanks,
> Bob
>
> On Wed, May 5, 2010 at 12:37 PM, Huddleston, John <
> Huddleston at cira.colostate.edu> wrote:
>
>>   Bob,
>>
>> Use a ftp client and go to ftp.cpc.ncep.noaa.gov and then into the wd52dg/snow
>> directory.
>>
>> There is a wkly_89x89 directory. Download wk2010.
>>
>> There is a progs directory and the readsnow.f file. Download readsnow.ffile. Uncomment the open(unit=93 line and edit it to read the file wk2010in your local path. Edit the open(unit=95 line to save the output file of a
>> name of your choosing. Compile the application using 'gfortran-o readsnowreadsnow.f'.
>> Run it './readsnow'
>>
>>  There is a grads_snw directory and a control file. Download plt_snw.ctland edit the top line to be the same name as your output file from unit-95
>> above.
>>
>> grads -l
>> open plt_snw.ctl
>> d snow
>>
>> If any of this makes no sense you need to take some basic IT and
>> programming courses.
>>
>> John Huddleston, PhD, PE
>>
>>  ------------------------------
>> *From:* gradsusr-bounces at gradsusr.org [gradsusr-bounces at gradsusr.org] On
>> Behalf Of bob duker [dukerbob at gmail.com]
>> *Sent:* Tuesday, May 04, 2010 11:08 PM
>> *To:* gradsusr at gradsusr.org
>> *Subject:* [gradsusr] Help new to grads
>>
>>    Hello All,
>> I'm doing snow Research and looking for a program to covert the climate
>> prediction center (CPC) Northern Hemosphere raw weekly snow data (in 1's and
>> 0's) into a useable number. I don't have much coding experience or computer
>> science background, so i'm not sure how to covert the data myself, or what
>> program to use. Also I don't have any fortran compiler. The CPC does covert
>> the data into a nice table format, but they don't keep it up todate. Their
>> website is http://www.cpc.ncep.noaa.gov/data/snow/. On their website they
>> have a link to grads.
>>
>> The program they give for reading weekly 89*89 snow data is
>>
>> PROGRAM AREA
>> C*********************************************************************
>> C
>> C THIS PROGRAM SIMPLY READS IN THE SNOW DATA AND
>> C WRITES IT OUT FOR A GIVEN YEAR.
>> C
>> C VARIABLES:
>> C
>> C    ISNDAT - 89 X 89 SNOW DATA
>> C
>> C FILES:
>> C
>> C    A YEAR OF WEEKLY SNOW DATA IS STORED IN A FILE WITH
>> C    THE NAMING CONVENTION:
>> C
>> C wk19xx   xx - is the year (ex. wk1973)
>> C
>> C*********************************************************************
>>
>>       DIMENSION ISNDAT(89,89)
>>       CHARACTER*1 ICHAR1,ICHAR2
>>       OPEN(11,FILE='INFILE',
>>      *   FORM='FORMATTED',ACCESS='SEQUENTIAL')
>>       OPEN(12,FILE='OUTFILE',
>>      *   FORM='FORMATTED',ACCESS='SEQUENTIAL')
>>        DO 199 LP = 1,52
>> C*********************************************************************
>> C
>> C READS IN THE WEEKLY SNOW DATA.
>> C
>> C*********************************************************************
>>         DO 200 I = 1,89
>>         READ(11,100,END=10) IYEARS,IWKS,IROW,ICHAR1,(ISNDAT(I,J),J=1,45)
>>   100    FORMAT (I4,2I2,A1,45I1)
>>         READ(11,101,END=10)IYEARS,IWKS,IROW,ICHAR2,(ISNDAT(I,J),J=46,89)
>>   101    FORMAT (I4,2I2,A1,44I1)
>> C*********************************************************************
>> C
>> C WRITE OUT THE WEEKLY SNOW DATA.
>> C
>> C*********************************************************************
>>          WRITE(12,100) IYEARS,IWKS,IROW,ICHAR1,(ISNDAT(I,J),J=1,45)
>>          WRITE(12,101) IYEARS,IWKS,IROW,ICHAR2,(ISNDAT(I,J),J=46,89)
>>   200   CONTINUE
>> READ(11,102) ICONST
>>   102    FORMAT(I4)
>> WRITE(12,102) ICONST
>> C
>>   199   CONTINUE
>>    10   CONTINUE
>> 999     STOP
>>          END
>>
>> I'm using windows 7 64bit operating system. My question is how do i use
>> grads to view the snow data or is there a fortran compiler the above program
>> will work on that i should use instead?
>> Thanks,
>> Bob R Duke
>>
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
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>


-- 
Gibies George,CSIR-RF,
Climate and Global Modelling Division,
Indian Institute of Tropical Meteorology,
Dr. Homi Bhabha Road,
NCL (P. O.), Pashan,
Pune 411008

http://sites.google.com/site/gibiesge/
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