[gradsusr] Back Trajectories

[Dr.Gamal El Afandi]

Hi Jeff,
Thanks so much!
Will try it.

With my kind regards
Gamal
_____________________________________________________
Dr.Gamal Salah El Afandi,Senior Researcher.
Data to Insight Center of Pervasive Technology Institute
Indiana University Bloomington USA
2719 E 10th St.
Innovation Center 
Room 130C. 
Bloomington, IN  47408,USA
Phone:+1 812-856-2146
Fax: +1 812-856-1735
 
http://as.cms.rtinfo.indiana.edu/d2i/people
http://pervasivetechnologylabs.iu.edu/d2i/people
 
Al Azhar University 
Faculty of science at Cairo 
Department of Astronomy and Meteorology
Nasr City,Postal Code 11884
Cairo,Egypt
http://maindb.unfccc.int/public/roe/expert_list.pl?id_country=66&
http://www.itap.purdue.edu/pto/NATO_KEEO/partCoDir_en.html
http://www.ucar.edu/governance/iap/iapreps.shtml
Tel. 0020238701259 Home   Tel. 0020222618163 Work 
Tel. 0020103770593 Cell      Fax 0020222629356 Work 
________________________________________________________


From: Jeffrey Duda <jdduda at iastate.edu>
>To: Dr.Gamal El Afandi <gamalafandy at yahoo.com>; GrADS Users Forum <gradsusr at gradsusr.org>
>Sent: Saturday, September 3, 2011 1:10 PM
>Subject: Re: [gradsusr] Back Trajectories
>
>
>Gamal,
>You can refer to other files using a dot and the file name.  For example, if you open several consecutive WRF files such as
>
>WRF_20110901_1200.ctl
>WRF_20110901_1800.ctl
>WRF_20110902_2000.ctl
>
>(assuming each file contains 6 hours of WRF output), then the variables associated with the second file will have a ".2" appended to them; likewise the variables associated with the nth file will have a ".n" appended to them.)
>
>In your script you just need to add the ".n" (or the corresponding number) to keep track of which variables to use when computing the trajectories according to the particular file the time is in.  It may end up being fairly complex, but I think you can do it.  Good luck.
>
>Jeff Duda
>
>
>On Sat, Sep 3, 2011 at 11:31 AM, Dr.Gamal El Afandi <gamalafandy at yahoo.com> wrote:
>
>Hi everybody,
>> 
>>I was able to use Grads to calculate and plot back-trajectories but there are 
some limitations related to that script (I can open just one file for each 
calculation) I need to think about. The main issue is that each WRF file 
contains only part of the daily values simulated for Indiana we need to get 24 
hours back trajectories because the WRF output is in UTC.  Therefore in order to 
calculate 24 hours back trajectories I would need to open simultaneously 
multiple files and in some way change the code (if it is possible to manage this 
issue) in order to get all the values and make Grads computing the trajectories. 
My main concern is that once I open 2 files I will have exactly the same 
variable names so I don't know if it is possible within that code to refer to a 
specific value/variable and compute our trajectories correctly.
>>please let me know if you have any suggestions, so that maybe I can try.
>>
>>With my kind regards 
>>Gamal
>>_____________________________________________________
>>Dr.Gamal Salah El Afandi,Senior Researcher.
>>Data to Insight Center of Pervasive Technology Institute 
>>Indiana University Bloomington USA 
>>2719 E 10th St.
>>Innovation Center 
>>Room 130C. 
>>Bloomington, IN  47408,USA 
>>Phone:+1 812-856-2146 
>>Fax: +1 812-856-1735 
>> 
>>http://as.cms.rtinfo.indiana.edu/d2i/people 
>>http://pervasivetechnologylabs.iu.edu/d2i/people
>>  
>>Al Azhar University 
>>Faculty of science at Cairo 
>>Department of Astronomy and Meteorology
>>Nasr City,Postal Code 11884
>>Cairo,Egypt
>>http://maindb.unfccc.int/public/roe/expert_list.pl?id_country=66& 
>>http://www.itap.purdue.edu/pto/NATO_KEEO/partCoDir_en.html 
>>http://www.ucar.edu/governance/iap/iapreps.shtml
>>Tel. 0020238701259 Home   Tel. 0020222618163 Work 
>>Tel. 0020103770593 Cell      Fax 0020222629356 Work 
>>________________________________________________________
>>
>>_______________________________________________
>>gradsusr mailing list
>>gradsusr at gradsusr.org
>>http://gradsusr.org/mailman/listinfo/gradsusr
>>
>>
>
>
>-- 
>Jeff Duda
>Iowa State University
>Meteorology Graduate Student
>www.meteor.iastate.edu/~jdduda
>
>
>
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