[ncl-talk] Converting Weekly to Monthly data

[Jatin Kala]

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 <http://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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