[ncl-talk] Extracting data for a given point from a model output
Setareh Rahimi
setareh.rahimi at gmail.com
Wed Dec 30 11:39:12 MST 2020
That attached was 'dry deposition flux', please ignore that, and have a
look at the attached file.
Thanks,
On Wed, Dec 30, 2020 at 10:01 PM Setareh Rahimi <setareh.rahimi at gmail.com>
wrote:
> Dear Dennis,
> This is something weird to me, too.I attached a plot of output model for
> the same date. Comparing the plot with the value for that lat/lon, results
> do not match together. What is your idea?
> Many thanks again,
> Best wishes,
>
> On Wed, Dec 30, 2020 at 7:09 PM Dennis Shea <shea at ucar.edu> wrote:
>
>> ???? does not return the value of the emflx variable for the desired
>> point (lat/lon)
>>
>> Well, what is the "correct value" ?
>> ======
>>
>> lat = 32.0
>> lon = 52.0
>>
>> (0) ==================
>> (0) n=21 m=8 lat2d(n,m)=31.9429 lon2d(n,m)=51.921 *<====This is
>> the closest grid point ... pretty close!!!*
>> (0) ==================
>>
>> (5) 605628 ymdh=2019010212
>> (6) 605634 ymdh=2019010218
>> *(7)* 605640 ymdh=*2019010300 <=== NT=7*
>> (8) 605646 ymdh=2019010306
>> (9) 605652 ymdh=2019010312
>>
>> *YMDH = 2019010300 * ; user specified
>> print("YMDH="+YMDH)
>> NT = ind(ymdh .eq. YMDH)
>> print("NT="+NT+" ymdh(NT)="+ymdh(NT) )
>>
>>
>> *(0) YMDH=2019010300(0) NT=7 ymdh(NT)=2019010300*
>> (0) ==================
>>
>> EMFLX = f->emflx
>> emflx = EMFLX(NT,n,m) ; scalar
>> print("==================")
>> print( emflx ) ; ====
>>
>> (0) 940.5043
>>
>> On Wed, Dec 30, 2020 at 8:15 AM Setareh Rahimi <setareh.rahimi at gmail.com>
>> wrote:
>>
>>> Dear Dennis,
>>> Thanks again for your guide. However, after running the code I noticed
>>> that Y = f->emflx(NT,n,m) does not return the value of the emflx
>>> variable for the desired point (lat/lon).
>>> May I ask you please to give me more advice in this regard?
>>> Best wishes,
>>>
>>> On Tue, Dec 29, 2020 at 3:22 AM Dennis Shea <shea at ucar.edu> wrote:
>>>
>>>> I think we have been through this before. There are many *time/date
>>>> functions.* <https://www.ncl.ucar.edu/Document/Functions/date.shtml>
>>>>
>>>> time = f->time ; hours since 1949-12-01 00:00:00 UTC"
>>>> ; [1]
>>>> TIME = *cd_calendar*
>>>> <https://www.ncl.ucar.edu/Document/Functions/Built-in/cd_calendar.shtml>(time,
>>>> 0) ; PLEASE read the documentation
>>>> year = toint( TIME(:,0) ) ; toint strips meta data
>>>> month = toint( TIME(:,1) )
>>>> day = toint( TIME(:,2) ) ; day of month
>>>> hour = toint( TIME(:,3) ) ; hour of day
>>>> minute = toint( TIME(:,4) )
>>>> second = toint( TIME(:,5) )
>>>>
>>>>
>>>> ;[2]
>>>> ymdh = *yyyymmddhh_time*
>>>> <https://www.ncl.ucar.edu/Document/Functions/Contributed/yyyymmddhh_time.shtml>(time,
>>>> -3) ; PLEASE read the documentation
>>>>
>>>> YMDH = 2019010300
>>>> nt =* ind*
>>>> <https://www.ncl.ucar.edu/Document/Functions/Built-in/ind.shtml>(ymdh
>>>> .eq. YMDH)
>>>> ================================================================
>>>> A simple script is attached.
>>>> ================================================================
>>>>
>>>> %> ncl setareh.ncl
>>>>
>>>> Please Look-at/READ the documentation of the functions used
>>>>
>>>> On Mon, Dec 28, 2020 at 3:04 PM Setareh Rahimi <
>>>> setareh.rahimi at gmail.com> wrote:
>>>>
>>>>>
>>>>> Dear Dennis,
>>>>> I am not looking for interpotation, temperature was just an example.
>>>>> Emflx is one of the varibles in the file. I need to know for say
>>>>> Jan-03-00:00UTC , what is the value of emflx for a specific point .
>>>>> Best wishes,
>>>>> On Tue, Dec 29, 2020 at 01:23 Dennis Shea <shea at ucar.edu> wrote:
>>>>>
>>>>>> As noted by Eshan, you want interpolation.
>>>>>> Please read the documentation for *rcm2points_Wrap* <https://www.ncl.ucar.edu/Document/Functions/Contributed/rcm2points_Wrap.shtml>
>>>>>>
>>>>>> Note: Temperature is NOT in the file.
>>>>>>
>>>>>>
>>>>>> f = *addfile* <https://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml>("Yazd-2019_DUST01.2019010100.nc" , "r")
>>>>>> lat2d = f->xlat
>>>>>> lon2d = f->xlon
>>>>>>
>>>>>> *printVarSummary* <https://www.ncl.ucar.edu/Document/Functions/Built-in/printVarSummary.shtml>(lat2d)
>>>>>> *printMinMax* <https://www.ncl.ucar.edu/Document/Functions/Contributed/printMinMax.shtml>(lat2d, 0)
>>>>>> *printMinMax* <https://www.ncl.ucar.edu/Document/Functions/Contributed/printMinMax.shtml>(lon2d, 0)
>>>>>>
>>>>>> stalat = 32.0 ;(/ 32.0 , 17.31, 24.05 /) ; user specified coordinate pairs
>>>>>> stalon = 52.0 ; (/ 52.0 ,-101.00,-92.46 /)
>>>>>>
>>>>>> X = f->mixrat ; (time, kz, iy, jx)
>>>>>> Y = d->ddflx ; (time, iy, jx)
>>>>>>
>>>>>> x = *rcm2points_Wrap* <https://www.ncl.ucar.edu/Document/Functions/Contributed/rcm2points_Wrap.shtml>(lat2d, lon2d, X, stalat, stalon, 0)
>>>>>> y = *rcm2points_Wrap* <https://www.ncl.ucar.edu/Document/Functions/Contributed/rcm2points_Wrap.shtml>(lat2d, lon2d, Y, stalat, stalon, 0)
>>>>>>
>>>>>> print(x)
>>>>>>
>>>>>> print(y)
>>>>>>
>>>>>>
>>>>>> On Mon, Dec 28, 2020 at 12:10 PM Setareh Rahimi <
>>>>>> setareh.rahimi at gmail.com> wrote:
>>>>>>
>>>>>>> Dear Dennis,
>>>>>>> Many thanks for your response. What I exactly mean is how to extract
>>>>>>> for example "Temperature variable" value for a specific lat/lon from the
>>>>>>> output result. For example: what is temperature value for a point at
>>>>>>> (lat=32, lon 52)?
>>>>>>> Thanks again
>>>>>>> Best wishes
>>>>>>>
>>>>>>> On Mon, Dec 28, 2020 at 10:17 PM Dennis Shea <shea at ucar.edu> wrote:
>>>>>>>
>>>>>>>> *getind_latlon2d *
>>>>>>>> <https://www.ncl.ucar.edu/Document/Functions/Contributed/getind_latlon2d.shtml>
>>>>>>>>
>>>>>>>> A modification of Example 1
>>>>>>>>
>>>>>>>> f = *addfile* <https://www.ncl.ucar.edu/Document/Functions/Built-in/addfile.shtml>("Yazd-2019_DUST01.2019010100.nc" , "r")
>>>>>>>> lat2d = f->xlat
>>>>>>>> lon2d = f->xlon
>>>>>>>>
>>>>>>>> *printVarSummary* <https://www.ncl.ucar.edu/Document/Functions/Built-in/printVarSummary.shtml>(lat2d)
>>>>>>>> *printMinMax* <https://www.ncl.ucar.edu/Document/Functions/Contributed/printMinMax.shtml>(lat2d, 0)
>>>>>>>> *printMinMax* <https://www.ncl.ucar.edu/Document/Functions/Contributed/printMinMax.shtml>(lon2d, 0)
>>>>>>>>
>>>>>>>> lat = (/ 31.0 , 17.31, 24.05 /) ; user specified coordinate pairs
>>>>>>>> lon = (/ -86.45,-101.00,-92.46 /)
>>>>>>>> ; return 2d subscripts
>>>>>>>> nm = *getind_latlon2d* (lat2d,lon2d, lat, lon)
>>>>>>>>
>>>>>>>> *print* <https://www.ncl.ucar.edu/Document/Functions/Built-in/print.shtml>(nm)
>>>>>>>>
>>>>>>>> X = f->mixrat ; (time, kz, iy, jx)
>>>>>>>> Y = d->ddflx ; (time, iy, jx)
>>>>>>>>
>>>>>>>> nt = .... the index some specified time
>>>>>>>>
>>>>>>>> kl = ... index
>>>>>>>>
>>>>>>>> do k=0,*dimsizes* <https://www.ncl.ucar.edu/Document/Functions/Built-in/dimsizes.shtml>(lat)-1
>>>>>>>> n = nm(k,0)
>>>>>>>> m = nm(k,1)
>>>>>>>>
>>>>>>>> x = X(nt,kl,n,m)
>>>>>>>> y = Y(nt,n,m)
>>>>>>>>
>>>>>>>> *print* <https://www.ncl.ucar.edu/Document/Functions/Built-in/print.shtml>(lat2d(n,m)+" "+lon2d(n,m)+" "+x+" "+y)
>>>>>>>> end do
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Dec 28, 2020 at 10:16 AM Setareh Rahimi via ncl-talk <
>>>>>>>> ncl-talk at mailman.ucar.edu> wrote:
>>>>>>>>
>>>>>>>>> Dear all,
>>>>>>>>>
>>>>>>>>> I need to extract data (it could be any variable like temperature,
>>>>>>>>> wind ...) for a specific point (say synoptic stations) at a specific day
>>>>>>>>> and time
>>>>>>>>> Yazd-2019_DUST01.2019010100.nc
>>>>>>>>> <https://drive.google.com/file/d/105vU4Hx2sRjvWlsmRBKOxa97kXp8Cx1_/view?usp=drive_web>
>>>>>>>>> ( Jan-03- 00:00 UTC), from a model output (file attached). I
>>>>>>>>> wonder how it could be achieved using NCL (any example...) .
>>>>>>>>>
>>>>>>>>> I appreciate any suggestion,
>>>>>>>>> Best wishes,
>>>>>>>>> --
>>>>>>>>> S.Rahimi
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> ncl-talk mailing list
>>>>>>>>> ncl-talk at mailman.ucar.edu
>>>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>>>> https://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> S.Rahimi
>>>>>>>
>>>>>>> --
>>>>> S.Rahimi
>>>>>
>>>>>
>>>
>>> --
>>> S.Rahimi
>>>
>>>
>
> --
> S.Rahimi
>
>
--
S.Rahimi
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