[ncl-talk] Fw: script for daily average

Thu Feb 1 09:43:57 MST 2018

The calculate_daily_values documentation states that the variable must have
a "time" coordinate attached to the leftmost dimension, with units
recognized by cd_calendar, i.e., units like "hours since 1-1-1 00:00:0.0"

You are working with WRF data, which doesn't have these kind of units
for time by default. You may need to use "wrf_times_c" to first convert
time to have the correct units, and then attach this new time array to your
variable before you call calculate_daily_values:

     Time_0

= wrf_times_c(

a->Times, 0 )

;

opt=0 ==>

"hours since" initial time on file

tc2
&Time = Time_0

; a
ttach Time_0 to the "Time" dimension of tc2

tc2DayAvg

= calculate_daily_values(tc2, "avg", nDim, False)

Please read the documentation on wrf_times_c to see what other options are
available, as the above may not be appropriate for your data.

http://www.ncl.ucar.edu/Document/Functions/WRF_contributed/wrf_times_c.shtml

--Mary

On Wed, Jan 31, 2018 at 6:31 PM, Muhammad Omer Mughal via ncl-talk <
ncl-talk at ucar.edu> wrote:

> Hi
>
>
> I tried to use the suggestion provided by Dennis below and it shows the
> error.I am using NCL version 6.4.0. I am repeating the steps here for
> convenience.
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRF_contributed.ncl"
>
> a=addfile("wrfout_d05_2016-04-01_00:00:00","r")
>
>  tc2= wrf_user_getvar(a,"T2",-1)
>
> nDim    = 0
>
> tc2DayAvg= calculate_daily_values(tc2, "avg", nDim, False)
>
>
> At this stage I get the following error
>
> fatal:No coordinate variable exists for dimension (Time) in variable (x)
> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 18125 in
> file /usr/local/ncl-6.4.0/lib/ncarg/nclscripts/csm/contributed.ncl
>
> So I try to do the following to correct this error
>
> tc2 at Time=wrf_times_c(a->Times,0)
>
> and repeat the command but I still receive the same error as above.
>
>
> I would appreciate the help depending upon your convenience.
>
> Muhammad Omer Mughal
> MSc BSc Mechanical Engineering
> PhD  Research Scholar
> Remote Sensing and Satellite Research Group
> Department of Imaging and Applied Physics
> Curtin University
>
> Curtin University
> Tel | +61 8 9266 7962
> Fax | +61 8 9266 2377
> Mobile | 0470 237 525
>
> Email | m.mughal1 at postgrad.curtin.edu.au <m.lynch at curtin.edu.au>
> Web | http://curtin.edu.au
>
> Curtin University is a trademark of Curtin University of Technology.
> CRICOS Provider Code 00301J (WA), 02637B (NSW)
>
>
> ------------------------------
> *From:* Dennis Shea <shea at ucar.edu>
> *Sent:* Thursday, 1 February 2018 5:51:50 AM
> *To:* Muhammad Omer Mughal
> *Cc:* ncl-talk at ucar.edu
> *Subject:* Re: [ncl-talk] Fw: script for daily average
>
> I am not sure what you were doing but *read the following documentation":
>
> https://www.ncl.ucar.edu/Document/Functions/Contributed/calculate_daily_
> values.shtml
> requires 6.4.0
>
> ========
>   nDim    = 0
>   tc2DayAvg= calculate_daily_values(tc2, "avg", nDim, False)
>   tc2DayAvg at description = "Daily Mean: " + tc2 at description
>
>   printVarSummary(tc2DayAvg)
>   printMinMax(tc2DayAvg,0)
>   print("-----")
>
> On Wed, Jan 31, 2018 at 2:24 PM, Muhammad Omer Mughal via ncl-talk <
> ncl-talk at ucar.edu> wrote:
>
>
>
>
> 
> Muhammad Omer Mughal
> MSc BSc Mechanical Engineering
> PhD  Research Scholar
> Remote Sensing and Satellite Research Group
> Department of Imaging and Applied Physics
> Curtin University
>
> Curtin University
> Tel | +61 8 9266 7962 <+61%208%209266%207962>
> Fax | +61 8 9266 2377 <+61%208%209266%202377>
> Mobile | 0470 237 525
>
> Email | m.mughal1 at postgrad.curtin.edu.au
> Web | http://curtin.edu.au
>
>  Curtin University is a trademark of Curtin University of Technology.
> CRICOS Provider Code 00301J (WA), 02637B (NSW)
>
> 
> ------------------------------
> *From:* Muhammad Omer Mughal
> *Sent:* Wednesday, 31 January 2018 12:17:57 PM
> *To:* ncl-talk at ucar.edu
> *Subject:* script for daily average
>
>
> Hi
>
>
> I wrote the following script to calculate the daily averages
>
>
> a=addfile("./wrfout_d05_2016-04-01_00:00:00","r")
> tc2= wrf_user_getvar(a,"T2",-1)
> tc2_dims=dimsizes(tc2)
> ntim=tc2_dims(0)
> nlat=tc2_dims(1)
> nlon=tc2_dims(2)
>
> ndays=ntim/24
>
> tc2D=reshape(tc2,(/ndays,nlat,nlon/))
> copy_VarAtts(tc2,tc2D)
> tc2_hr_avg=dim_avg_n_Wrap(tc2D,0)
>
> printVarSummary(tc2_hr)
>
> but I am seeing the following error
>
>
> input dimension sizes cannot conform to dimensions of input array
>
> The Var summaries are as follows
> Variable: tc2
> Type: float
> Total Size: 75526920 bytes
>             18881730 values
> Number of Dimensions: 3
> Dimensions and sizes:    [Time | 697] x [south_north | 129] x [west_east |
> 210]
> Coordinates:
> Number Of Attributes: 6
>   coordinates :    XLONG XLAT XTIME
>   stagger :
>   units :    K
>   description :    TEMP at 2 M
>   MemoryOrder :    XY
>   FieldType :    104
>
> Variable: nlat
> Type: integer
> Total Size: 4 bytes
>             1 values
> Number of Dimensions: 1
> Dimensions and sizes:    [1]
> Coordinates:
> (0)    129
>
>
>
>
>
>
>
> Muhammad Omer Mughal
> MSc BSc Mechanical Engineering
> PhD  Research Scholar
> Remote Sensing and Satellite Research Group
> Department of Imaging and Applied Physics
> Curtin University
>
> Curtin University
> Tel | +61 8 9266 7962
> Fax | +61 8 9266 2377
> Mobile | 0470 237 525
>
> Email | m.mughal1 at postgrad.curtin.edu.au <m.lynch at curtin.edu.au>
> Web | http://curtin.edu.au
>
> Curtin University is a trademark of Curtin University of Technology.
> CRICOS Provider Code 00301J (WA), 02637B (NSW)
>
>
>
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