[ncl-talk] Time Labels -

[Prasad Kunjeer]

Sir,

The time interval for WRF file is 3 hour and there are 25 time steps. The
first time steps is 22/09/2018 1200. The time should start from 22/09/2018
and end at 25/09/2018 with 25 time steps (22/09/2018 1200, 22/09/2018 1500
etc upto 25/09/2018  1200).  But the graph ends at 23/09/2018 1200 which
correspond to 25 time steps at 1 hour interval. I want graph to end at
25/09/2018 1200. I hope I am able to clarify my doubt. Thanks for
responding.

On Thu, Sep 26, 2019, 11:23 PM Rick Brownrigg <brownrig at ucar.edu> wrote:

> Hi,
>
> I am confused by your question/issue:  the plot shows two time labels,
> 9/22 12:00  and 9/23 6:00, which would appear to be a 12 hour interval
> labelling -- I don't understand your comment "...the output takes 1 hour
> interval rather than 3 hour interval."
>
> Rick
>
>
> On Thu, Sep 26, 2019 at 9:19 AM Prasad Kunjeer via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>> Sir,
>>
>> I am trying to plot a simple graph from a WRF output. The X axis of the
>> plot is time  and i want to print the time table for the same. I am using
>> the function 'time_axis_labels'. I have attached the script:
>>
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/contrib/time_axis_labels.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"
>> ;load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> ;load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>> ;load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>> ; This file still has to be loaded manually
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/esmf/ESMF_regridding.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/contrib/time_axis_labels.ncl"
>>
>>     srcDirName  = "/home/prasad/res/"
>>     srcFileName = "newdo3.nc"
>>     srcFilePath =  srcDirName + srcFileName
>> ;---Retrieve either one level, or all levels. Use '-1' for all.
>>     sfile = addfile(srcFilePath,"r")
>>
>>     ua   = wrf_user_getvar(sfile,"ua",-1)    ; On mass grid
>>     va   = wrf_user_getvar(sfile,"va",-1)
>>     printVarSummary(ua)                      ;
>> (Time,bottom_top,south_north,west_east)
>>     printVarSummary(va)                      ;
>> (Time,bottom_top,south_north,west_east)
>>
>>     Times        = sfile->Times
>>     Time_0       = wrf_times_c(Times, 0)
>>
>>     printVarSummary(Times)
>>     printVarSummary(Time_0)
>>     print(Time_0)
>>
>>     wks = gsn_open_wks("png","time_labels") ; send graphics to PNG file
>> ;--------------------------------------------------
>> ; The time_axis_label function adds additional
>> ; resources to "res" to produce nicely-formatted
>> ; time labels on X axis. This function only works
>> ; if you have a time "units" recognized by the
>> ; cd_calendar function.
>> ;--------------------------------------------------
>>   pltres = True
>>   restime           = True
>>   restick           = True
>>   restick at ttmFormat = "%N/%D %H:%M"
>>   time_axis_labels(Time_0,restime,restick)
>>
>>   contour_vor  = wrf_contour(sfile,wks,ua(:,:,100,100),restime)
>>   plot = wrf_overlays(sfile,wks,(/contour_vor/),pltres)
>>
>>
>> The WRF file contains the 25 time steps at 3 hour interval. I have
>> attached the output of printvarSummary and print of the time varibale.
>>
>> Variable: Time_0
>> Type: double
>> Total Size: 200 bytes
>>             25 values
>> Number of Dimensions: 1
>> Dimensions and sizes: [Time | 25]
>> Coordinates:
>>             Time: [   0..  72]
>> Number Of Attributes: 4
>>   units : hours since 2018-09-22 12:00:00
>>   calendar : standard
>>   long_name : Time
>>   description : Time
>>
>> Variable: Time_0
>> Type: double
>> Total Size: 200 bytes
>>             25 values
>> Number of Dimensions: 1
>> Dimensions and sizes: [Time | 25]
>> Coordinates:
>>             Time: [   0..  72]
>> Number Of Attributes: 4
>>   units : hours since 2018-09-22 12:00:00
>>   calendar : standard
>>   long_name : Time
>>   description : Time
>> (0)   0
>> (1)   3
>> (2)   6
>> (3)   9
>> (4)  12 etc.
>>
>> But when I plot the figure, the output takes 1 hour interval rather than
>> 3 hour interval.
>>
>> Please guide in correcting the output of graph
>>
>> Regards
>> प्रसाद कुंजीर / Prasad Kunjeer
>> वैज्ञानिक - सी / Scientist - C
>> केन्द्रीय जल और विद्युत अनुसंधान शाला / Central Water and Power Research
>> Station
>> पुणे 411 024/ Pune 411 024
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