[ncl-talk] Converting Weekly to Monthly data

[Ipshita Majhi]

Thank you i will try both means
Regards
Ipshita

On Wednesday, September 10, 2014, Dennis Shea <shea at ucar.edu> wrote:

> There is also:
>
>
> http://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_monthly_values.shtml
>
> ==
> However, you should learn to use the CDO also.
>
> On Wed, Sep 10, 2014 at 6:44 AM, Ipshita Majhi <ipmajhi at alaska.edu
> <javascript:_e(%7B%7D,'cvml','ipmajhi at alaska.edu');>> wrote:
>
>> Thank you I will do the needful
>>
>>
>> On Wednesday, September 10, 2014, Jatin Kala <jatin.kala.jk at gmail.com
>> <javascript:_e(%7B%7D,'cvml','jatin.kala.jk at gmail.com');>> wrote:
>>
>>>  You can do this in one line using CDO tools:
>>> https://code.zmaw.de/projects/cdo
>>>
>>> cdo monmean input_file.nc outputfile.nc
>>>
>>> And with regards to your script, there is no "for" and "end" in NCL!
>>> You should use "do" and "end do"
>>> http://www.ncl.ucar.edu/Document/Language/loops.shtml
>>>
>>> Please read the documentation.
>>>
>>>
>>>
>>>
>>> On 10/09/14 2:55 PM, Ipshita Majhi wrote:
>>>
>>>    Dear NCL
>>>
>>>  How can I convert a weekly data to monthly and the time of the data is
>>> in georgian form:-
>>>  Here are the global attributes for it
>>>
>>> netcdf nhsce_v01r01_19661004_20140602 {
>>> dimensions:
>>>     cols = 88 ;
>>>     rows = 88 ;
>>>     time = UNLIMITED ; // (2487 currently)
>>> variables:
>>>     char coord_system ;
>>>         coord_system:grid_mapping_name = "latitude_longitude" ;
>>>         coord_system:longitude_of_central_meridian = 0. ;
>>>         coord_system:semimajor_axis = 6378137 ;
>>>         coord_system:semiminor_axis = 6356752.3 ;
>>>     int time(time) ;
>>>         time:standard_name = "time" ;
>>>         time:long_name = "time" ;
>>>         time:units = "days since 1966-10-03" ;
>>>         time:axis = "T" ;
>>>         time:valid_range = 7, 17409 ;
>>>         time:calendar = "gregorian" ;
>>>     float snow_cover_threshold ;
>>>         snow_cover_threshold:standard_name =
>>> "surface_snow_area_fraction" ;
>>>         snow_cover_threshold:long_name = "threshold for the
>>> snow_cover_extent measurement" ;
>>>         snow_cover_threshold:units = "1" ;
>>>
>>> ***********************************************************************
>>>
>>>  Here is my code and one of the fatal error is that i is undefined
>>>
>>> ; This program is to calculate the area average for snow for all the
>>> data period
>>> ;*******************************************
>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>>> ;*******************************************
>>>
>>> ;The intention is to average the sce for each year and for each month
>>>
>>> a=addfile("~/Documents/Snow_cover_IMS/nhsce_v01r01_19661004_20140602.nc
>>> ","r")
>>>
>>> sce=a->snow_cover_extent(0,:,:)
>>>
>>> t=a->time
>>> asciiwrite("time.txt",t); saving time as a text file
>>>
>>> ;Reading in the same text file
>>>
>>>
>>>  time=asciiread("~/Documents/Snow_cover_IMS/NCL_codes/time.txt",-1,"float")
>>>
>>> jan=new((/47,2/); I want the data to go from 1966 to 2012 with one
>>> column with year information and other with data from sce
>>> feb=new((/47,2/);
>>> mar=new((/47,2/);
>>> apr=new((/47,2/);
>>> may=new((/47,2/);
>>> june=new((/47,2/);
>>> july=new((/47,2/);
>>> aug=new((/47,2/);
>>> sept=new((/47,2/);
>>> oct=new((/47,2/);
>>> nov=new((/47,2/);
>>> dec=new((/47,2/);
>>>
>>>  x = ispan (1,10,1)
>>> years=ispan(1966,2012,1)
>>> month=ispan(1,12,1)
>>>
>>> for i=0,dimsizes(time)-1,7; since I saved time as a text file and the
>>> date appears in a horizontal manner I am attaching the txt file
>>>                         ;better clarity
>>> t(nyr)==year(i)
>>> if time(nyr+1)==1
>>> jan(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==2
>>> feb(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==3
>>> mar(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==4
>>> apr(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==5
>>> may(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==6
>>> june(i)=(year(i),sce(i,;,:))
>>> else if time(nyr+1)==7
>>> july(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==8
>>> aug(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==9
>>> sept(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==10
>>> oct(i)=(year(i),sce(i,:,:))
>>> else if time(nyr+1)==10
>>> nov(i)=(year(i),sce(i,:,:))
>>> else
>>> dec(i)=(year(i),sce(i,:,:))
>>> i=i+1
>>> end
>>>
>>>  what is missing in the code!
>>>
>>>  I would be grateful for any guidance
>>>
>>> Best Regards
>>> Ipshita
>>>
>>>
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