[gradsusr] TRMM data
Syed Ahsan Ali
ahsanshah01 at gmail.com
Wed Jun 6 11:34:33 EDT 2012
Dear Zhong
Thanks alot for the email. This is great news that V7 is available.
I have tried a simple thing that is concatenation of all files using CAT
command in linux to make a single file. I'll also try the method which you
have mentioned.
Thank you
Best Regards
Ahsan
On Wed, Jun 6, 2012 at 8:17 PM, Zhong Liu <Zhong.Liu-1 at nasa.gov> wrote:
> Dear Ahsan,
>
> Dr. Lynnes forwarded your question to me.
>
> First, V7 TRMM 3B42 and its daily have just been released. Please use them
> if possible,
>
> ftp://disc2.nascom.nasa.gov/**data/TRMM/Gridded/3B42_V7<ftp://disc2.nascom.nasa.gov/data/TRMM/Gridded/3B42_V7>( for 3 hourly)
> ftp://disc2.nascom.nasa.gov/**data/TRMM/Gridded/Derived_**
> Products/3B42_V7/Daily<ftp://disc2.nascom.nasa.gov/data/TRMM/Gridded/Derived_Products/3B42_V7/Daily>(daily)
>
> To aggregate files, I have an example below.
>
> Please note that the similar method can be applied to GDS, OPeNDAP, or
> binary files (listed in the above
> directories).
>
> Hope these help.
>
> Regards,
>
> -Zhong
>
> ga-> open 3b42_netcdf.ctl
> Scanning description file: 3b42_netcdf.ctl
> Data file 3B42.%y2%m2%d2.%h1.6A.nc <http://h1.6a.nc/> is open as file 1
> LON set to 0 360
> LAT set to -49.875 49.875
> LEV set to 1000 1000
> Time values set: 1998:1:1:0 1998:1:1:0
> ga-> set time 18z1apr2010 0z2apr2010
> Time values set: 2010:4:1:18 2010:4:2:0
> ga-> define rtmp=r
> Define memory allocation size = 6921600 bytes
> ga-> set fwrite test.bin
> FWrite file name = test.bin
> FWwrite byte order is little_endian; format is stream
> Fwrite replacing an existing file if it exist
> ga-> set gxout fwrite
> ga-> d rtmp
> Wrote 576800 of 576800 elements to test.bin as Stream Little_Endian
> Wrote 576800 of 576800 elements to test.bin as Stream Little_Endian
> Wrote 576800 of 576800 elements to test.bin as Stream Little_Endian
> Press enter to continue:::::
> ga-> disable fwrite
>
> where 3b42_netcdf.ctl is,
>
> dset ^3B42.%y2%m2%d2.%h1.6A.nc <http://h1.6a.nc/>
> dtype netcdf
> options template
> title TRMM 3B42 V6 three hourly TRMM rainfall
> undef -9999.9
> xdef 1440 linear -179.875 0.25000000
> ydef 400 linear -49.8750000 0.25000000
> zdef 1 levels 1000
> tdef 41384 linear 00:00Z01jan1998 3hr
> * end_time 21:00Z29feb2012 (this_is_comment_line)
> vars 2
> precipitation=>r 0 y,x Hourly Rain Rate (mm/hr)
> relativeError=>err 0 y,x Error (mm/hr)
> endvars
>
> and to test the output file, use this ctl,
>
> dset test.bin
> title TRMM 3B42 V6 three hourly TRMM rainfall
> undef -9999.9
> xdef 1440 linear -179.875 0.25000000
> ydef 400 linear -49.8750000 0.25000000
> zdef 1 levels 1000
> tdef 39432 linear 00:00Z01jan1998 3hr
> * end_time 21:00Z30jun2011 (this_is_comment_line)
> vars 1
> r 0 99 Hourly Rain Rate (mm/hr)
> endvars
>
>
>
>
> On 6/5/2012 7:53 AM, Lynnes, Christopher S. (GSFC-6102) wrote:
>
>> On Jun 5, 2012, at 7:47 AM, Christopher Lynnes wrote:
>>
>> Is this something that can be solved by our GDS server for this user?
>>>
>> I'm thinking of: http://disc2.nascom.nasa.gov/**dods/3B42RT.info<http://disc2.nascom.nasa.gov/dods/3B42RT.info>
>>
>> But I don't know how to aggregate to a time series using GrADS. It must
>> be possible…
>>
>> Begin forwarded message:
>>>
>>> From: Syed Ahsan Ali<ahsanshah01 at gmail.com>
>>>> Subject: Re: [gradsusr] TRMM data
>>>> Date: June 5, 2012 3:53:14 AM EDT
>>>> To: GrADS Users Forum<gradsusr at gradsusr.org>
>>>> Reply-To: GrADS Users Forum<gradsusr at gradsusr.org>
>>>>
>>>>
>>>> Dear Jayakrishnan,
>>>> I have downloaded the 3-hourly nc files and also had a plan to
>>>> concatenate all of them, but the problem was that there is no date
>>>> information in the file so when I'll concatenate there would be a mess up.
>>>> Thanks for the link. But I don't know how to combine these binary files.
>>>> Any hint for this.
>>>>
>>>> Best Regards
>>>> Ahsan
>>>>
>>>> On Tue, Jun 5, 2012 at 10:08 AM, Jayakrishnan P.R<
>>>> prjayakrishnan at gmail.com> wrote:
>>>> Dear Ahsan,
>>>> I think you downloaded the single nc file from mirador
>>>> search. It will contain only sinlgle time data in each 3 hour. To have a
>>>> time series of data you will have to concatenate the data files. There is
>>>> another simple site to download the binary files of TRMM three hourly as
>>>> well as daily. You can download the data from this alternate site and
>>>> combine the data files and write a corresponding ctl file.
>>>>
>>>> This is the link for TRMM data
>>>>
>>>> ftp://disc2.nascom.nasa.gov/**data/TRMM/Gridded/3B42_V6<ftp://disc2.nascom.nasa.gov/data/TRMM/Gridded/3B42_V6>( for 3 hourly)
>>>> ftp://disc2.nascom.nasa.gov/**data/TRMM/Gridded/Derived_**
>>>> Products/3B42_V6/Daily<ftp://disc2.nascom.nasa.gov/data/TRMM/Gridded/Derived_Products/3B42_V6/Daily>(daily)
>>>>
>>>>
>>>> Best of luck.....
>>>> --
>>>> Sincerely
>>>> *************************************************
>>>> Jayakrishnan.P.R
>>>> CSIR-Senior Research Fellow
>>>> Department of Atmospheric Sciences
>>>> Cochin University of Science and Technology (CUSAT), Cochin-682 016
>>>> Kerala, India.
>>>> Mob: 09895417565
>>>>
>>>> *************************************************
>>>>
>>>> ______________________________**_________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/**listinfo/gradsusr<http://gradsusr.org/mailman/listinfo/gradsusr>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> ______________________________**_________________
>>>> gradsusr mailing list
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>>>> http://gradsusr.org/mailman/**listinfo/gradsusr<http://gradsusr.org/mailman/listinfo/gradsusr>
>>>>
>>> --
>>> Dr. Christopher Lynnes, NASA/GSFC, Code 610.2, 301-614-5185
>>>
>>> --
>> Dr. Christopher Lynnes, NASA/GSFC, Code 610.2, 301-614-5185
>>
>>
>
> --
> Zhong Liu, Ph.D.
> Zhong.Liu-1 at nasa.gov
> George Mason University and
> NASA Goddard Earth Sciences Data and
> Information Services Center
> NASA/GSFC, Code 610.2
> Greenbelt. MD. 20771 U.S.A.
> (301) 614-5764 (voice)
> (301) 614-5268 (fax)
> http://disc.gsfc.nasa.gov
> http://disc2.nascom.nasa.gov/**Giovanni/tovas/<http://disc2.nascom.nasa.gov/Giovanni/tovas/>
> http://disc.sci.gsfc.nasa.gov/**hurricane/trmm_quikscat_**analysis.shtml<http://disc.sci.gsfc.nasa.gov/hurricane/trmm_quikscat_analysis.shtml>
> http://disc.sci.gsfc.nasa.gov/**agriculture/ais_sup/current_**
> conditions.shtml<http://disc.sci.gsfc.nasa.gov/agriculture/ais_sup/current_conditions.shtml>
>
>
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