[ncl-talk] grid_area_avg
Kunal Bali
kunal.bali9 at gmail.com
Tue Oct 17 03:25:21 MDT 2017
I did the following changes but still getting an error of *aot_subset*
which is undefined.
please let me know that how to fix or defined the *aot_subset *this problem.
latv = (/ 18, 24/) ; for extracting grid box data
lonv = (/ 74, 78 /)
nm = getind_latlon2d (lat2d, lon2d, latv, lonv)
ilt1 = nm(0,0) ; start lat index
ilt2 = nm(1,0) ; start lon index
iln1 = nm(0,1) ; end lat index
iln2 = nm(1,1) ; end lon index
lat_subset := lat2d(ilt1:ilt2,iln1:iln2)
lon_subset := lon2d(ilt1:ilt2,iln1:iln2)
aot_subset := data
* aot_subset(ilt1:ilt2,iln1:iln2) := data(ilt1:ilt2, iln1:iln2)*
;printVarSummary(aot_subset)
aot_avg = avg(data)
aot_subset_avg = avg(*aot_subset*)
;print(nm)
print("-----")
do k=0,dimsizes(latv)-1
n = nm(k,0)
m = nm(k,1)
print(lat2d(n,m)+" "+lon2d(n,m))
print(" "+data(:,n,m)) ; nearest grid point at
all time steps
print("-----")
end do
regards
Kunal Bali
On Tue, Oct 17, 2017 at 12:41 PM, Kunal Bali <kunal.bali9 at gmail.com> wrote:
> I have sent the ncl script and data to the incoming dir with the given
> names as
>
> data = maiactaotE.h00v03.20003660525-20003660700.nc.bz2
> ncl_script = extract_iiserb.ncl
>
> I am not able to define the var_subset in the given script.
> please let me know if you have received the data and script?
>
>
>
>
>
> Kunal Bali
>
>
>
>
>
>
> On Mon, Oct 16, 2017 at 11:07 PM, Mary Haley <haley at ucar.edu> wrote:
>
>> Kunal,
>>
>> You must make an effort to debug some of these problems on your own. The
>> error is telling you that something is wrong around line 34 and it is
>> telling you exactly what the problem is. Please try to fix this error.
>>
>> If you continue to have problems after fixing this error, then I need to
>> ask you to provide the full script and data via ftp:
>>
>> http://www.ncl.ucar.edu/ftp_files.shtml
>>
>> However, make sure you debug any other new problems that come up, instead
>> of just emailing them to ncl-talk. We have a page to help you understand
>> some of NCL's errors, and what causes them:
>>
>> http://www.ncl.ucar.edu/Document/Language/error_messages.shtml
>>
>> The particular error you're seeing can be found here:
>>
>> http://www.ncl.ucar.edu/Document/Language/error_messages.shtml#NumSubRHS
>>
>> As a side note, you are running a 3-year old version of NCL. I suggest
>> that you upgrade to NCL V6.4.0.
>>
>> --Mary
>>
>>
>>
>> On Mon, Oct 16, 2017 at 12:52 AM, Kunal Bali <kunal.bali9 at gmail.com>
>> wrote:
>>
>>> I simply include the code (which you mentioned) were I was taking the
>>> avg of the data as given below (please correct me if I did wrong)
>>>
>>>
>>> ;----------------------------------------------------------------------
>>> ; Main code
>>> ;----------------------------------------------------------------------
>>> dir = "./"
>>> fnames = systemfunc("ls " + dir + "maiactaot*.nc")
>>> print(fnames)
>>> a = addfile(fnames,"r")
>>> data = short2flt(a->Optical_Depth_055_grid1km)
>>> printVarSummary (data)
>>> printMinMax (data, 0)
>>> print("-----")
>>> nFill = num(ismissing(data))
>>> print("nFill="+nFill)
>>> print("-----")
>>>
>>> lat2d = a->GridLat_grid1km
>>> lon2d = a->GridLon_grid1km
>>> printMinMax (lat2d, 0)
>>> printMinMax (lon2d, 0)
>>> print("-----")
>>>
>>> ;---grid points of interest
>>> ;---http://www.ncl.ucar.edu/Document/Functions/Contributed/g
>>> etind_latlon2d.shtml
>>> ; latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>>> ; lonv = (/76, 76.0, 78.0, 78.0, 76.0/)
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> *latv = (/ 22, 24/) lonv = (/ 76, 78 /) nm = getind_latlon2d (lat2d,
>>> lon2d, latv, lonv) ilt1 = nm(0,0) ; start lat index ilt2 = nm(1,0) ;
>>> start lon index iln1 = nm(0,1) ; end lat index iln2 = nm(1,1) ; end lon
>>> index var_subset = var(ilt1:ilt2,iln1:iln2) var_subset_avg =
>>> avg(var_subset)*
>>>
>>> print(nm)
>>> print("-----")
>>>
>>> do k=0,dimsizes(latv)-1
>>> n = nm(k,0)
>>> m = nm(k,1)
>>> print(lat2d(n,m)+" "+lon2d(n,m))
>>> print(" "+data(:,n,m)) ; nearest grid point
>>> at all time steps
>>> print("-----")
>>> end do
>>>
>>>
>>>
>>>
>>>
>>> *But still not getting the desired output as a single square box mean
>>> value . It is showing the errors as*
>>>
>>> kunal at kunal-Vostro-1015:/media/Local Disk_/IIT_DELHI/2001/MAIACTAOT_TIME$
>>> ncl extract1.ncl
>>> Copyright (C) 1995-2014 - All Rights Reserved
>>> University Corporation for Atmospheric Research
>>> NCAR Command Language Version 6.2.1
>>> The use of this software is governed by a License Agreement.
>>> See http://www.ncl.ucar.edu/ for more details.
>>>
>>>
>>> Variable: fnames
>>> Type: string
>>> Total Size: 4 bytes
>>> 1 values
>>> Number of Dimensions: 1
>>> Dimensions and sizes: [1]
>>> Coordinates:
>>> (0) ./maiactaot.h00v02.20010040635-20011550640.nc
>>>
>>> Variable: data
>>> Type: float
>>> Total Size: 40320000 bytes
>>> 10080000 values
>>> Number of Dimensions: 3
>>> Dimensions and sizes: [time | 7] x [YDim_grid1km | 1200] x
>>> [XDim_grid1km | 1200]
>>> Coordinates:
>>> time: [8862.583333333314..12486.66666666669]
>>> Number Of Attributes: 8
>>> coordinates : GridLat_grid1km, GridLon_grid1km
>>> hdfeos_name : Optical_Depth_055
>>> projection : Albers Conical Equal_Area
>>> unit : None
>>> long_name : AOT at 0.55 micron
>>> _FillValue_original : -28672
>>> _FillValue : -28672
>>> valid_range : ( -0.1, 5 )
>>> (0) AOT at 0.55 micron: min=0 max=3.924
>>> (0) -----
>>> (0) nFill=6285271
>>> (0) -----
>>> (0) latitude: min=21.86737357453027 max=34.99855492029426
>>> (0) longitude: min=64.23634233372005 max=79.4747290253718
>>> (0) -----
>>> fatal:["Execute.c":7863]:Number of subscripts on right-hand-side do not
>>> match
>>> number of dimensions of variable: (2), Subscripts used: (3)
>>>
>>> fatal:["Execute.c":8578]:Execute: Error occurred at or near line 34 in
>>> file extract1.ncl
>>>
>>> fatal:Variable (var_subset) is undefined
>>> fatal:["Execute.c":8578]:Execute: Error occurred at or near line 35 in
>>> file extract1.ncl
>>>
>>>
>>>
>>>
>>> Variable: nm
>>> Type: integer
>>> Total Size: 16 bytes
>>> 4 values
>>> Number of Dimensions: 2
>>> Dimensions and sizes: [2] x [2]
>>> Coordinates:
>>> Number Of Attributes: 1
>>> long_name : indices closest to specified LAT/LON coordinate pairs
>>> (0,0) 1199
>>> (0,1) 792
>>> (1,0) 1199
>>> (1,1) 1041
>>> (0) -----
>>> (0) 23.76603307545667 75.53995171540016
>>> (0) 0.179
>>> (1) 0.142
>>> (2) -28672
>>> (3) 0.169
>>> (4) -28672
>>> (5) -28672
>>> (6) -28672
>>> (0) -----
>>> (0) 24.26559325846936 77.93996773594735
>>> (0) -28672
>>> (1) 0.393
>>> (2) -28672
>>> (3) 0.156
>>> (4) 0.313
>>> (5) -28672
>>> (6) -28672
>>> (0) -----
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Kunal Bali
>>>
>>>
>>>
>>>
>>>
>>> On Sat, Oct 14, 2017 at 12:24 AM, Mary Haley <haley at ucar.edu> wrote:
>>>
>>>> Kunal,
>>>>
>>>> Please include the code where you are actually taking the average of
>>>> your data using the information returned from getind_latlon2d.
>>>>
>>>> It's important to note that getind_latlon2d simply returns the
>>>> individual index values that are closest to each of the lat/lon pairs that
>>>> you gave it. It doesn't work in such a way that you give it a lat/lon box
>>>> and it returns all the values in that box.
>>>>
>>>> That's what I was trying to illustrate with the wrf_gsn_10.ncl I
>>>> created. I gave the function two corners of the box, and then using the
>>>> two pairs of index values I got back, I was able to get all the values
>>>> inside the box area of interest:
>>>>
>>>> lats = (/ min_lat, max_lat /)
>>>> lons = (/ min_lon, max_lon /)
>>>> nm = getind_latlon2d (lat2d, lon2d, lats, lons)
>>>> ilt1 = nm(0,0) ; start lat index
>>>> ilt2 = nm(1,0) ; start lon index
>>>> iln1 = nm(0,1) ; end lat index
>>>> iln2 = nm(1,1) ; end lon index
>>>> var_subset = var(ilt1:ilt2,iln1:iln2)
>>>> var_subset_avg = avg(var_subset)
>>>>
>>>> --Mary
>>>>
>>>>
>>>> On Thu, Oct 12, 2017 at 1:19 PM, Kunal Bali <kunal.bali9 at gmail.com>
>>>> wrote:
>>>>
>>>>> Dear Haley Ma'am,
>>>>>
>>>>> Thanks for providing the information and example.
>>>>> But if I follow the getind_latlon2d function as I did, then it seems
>>>>> like I followed the same procedure as given in the example
>>>>> http://www.ncl.ucar.edu/Document/Functions/Contributed/getin
>>>>> d_latlon2d.shtml
>>>>>
>>>>> But still I am not getting the mean of the grid box on every time
>>>>> step or am I reading incorrectly the result ?
>>>>>
>>>>>
>>>>> regards
>>>>> Kunal Bali
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Oct 13, 2017 at 12:11 AM, Mary Haley <haley at ucar.edu> wrote:
>>>>>
>>>>>> Kunal,
>>>>>>
>>>>>> I created an example for you, showing three ways you can subset a WRF
>>>>>> grid (since I already had a similar example). It shows how to use the
>>>>>> getind_latlon2d function.
>>>>>>
>>>>>> You have to be careful with subsetting curvilinear data, because
>>>>>> specifying a lat/lon box to take an average over can mean two
>>>>>> different things. You will be able to see the difference when you look at
>>>>>> the graphic.
>>>>>>
>>>>>> See example wrf_gsn_10.ncl at:
>>>>>>
>>>>>> http://www.ncl.ucar.edu/Applications/wrfgsn.shtml#ex10
>>>>>>
>>>>>> --Mary
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 11, 2017 at 12:03 PM, Kunal Bali <kunal.bali9 at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Dear NCL users,
>>>>>>>
>>>>>>> Single point coordinates values of 23.0 N and 77.0 E is extracted or
>>>>>>> print by using the script below
>>>>>>>
>>>>>>> ------------------------------------------------------------
>>>>>>> ----------
>>>>>>> ; Main code
>>>>>>> ;-----------------------------------------------------------
>>>>>>> -----------
>>>>>>> dir = "./"
>>>>>>> fnames = systemfunc("ls " + dir + "maiactaot*.nc")
>>>>>>> print(fnames)
>>>>>>> a = addfile(fnames,"r")
>>>>>>> data = short2flt(a->Optical_Depth_055_grid1km)
>>>>>>> nFill = num(ismissing(data))
>>>>>>> lat2d = a->GridLat_grid1km
>>>>>>> lon2d = a->GridLon_grid1km
>>>>>>>
>>>>>>> ;---grid points of interest
>>>>>>> latv = (/23.0/)
>>>>>>> lonv = (/77.0 /)
>>>>>>>
>>>>>>> nm = getind_latlon2d (lat2d,lon2d, latv, lonv)
>>>>>>>
>>>>>>> do k=0,dimsizes(latv)-1
>>>>>>> n = nm(k,0)
>>>>>>> m = nm(k,1)
>>>>>>> print(lat2d(n,m)+" "+lon2d(n,m)) ; grid point location
>>>>>>> print(" "+data(:,n,m)) ; nearest grid
>>>>>>> point at all time steps
>>>>>>> print("-----")
>>>>>>> end do
>>>>>>>
>>>>>>>
>>>>>>> NOW, I want to extract the square grid box of 100 km around the
>>>>>>> coordinates (23N,77E) such as
>>>>>>> latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>>>>>>> lonv = (/76, 76.0, 78.0, 78.0, 76.0 /)
>>>>>>>
>>>>>>>
>>>>>>> after that I want to do the area mean of the grid box. So that I
>>>>>>> can get one single point value of that grid box.
>>>>>>> So when I replacing
>>>>>>> latv = (/23.0/)
>>>>>>> lonv = (/77.0/)
>>>>>>>
>>>>>>> with
>>>>>>>
>>>>>>> latv = (/22, 24.0, 24.0, 22.0, 22.0/)
>>>>>>> lonv = (/76, 76.0, 78.0, 78.0, 76.0 /)
>>>>>>>
>>>>>>> then It's not giving mean of the square grid box.
>>>>>>>
>>>>>>> It shows the something like that (given below), which is incorrect.
>>>>>>> So please let me know how can I get the square grid box mean and then
>>>>>>> extract as asciiwrite or print?
>>>>>>>
>>>>>>> (0) 23.76603307545667 75.53995171540016
>>>>>>> (0) 0.179
>>>>>>> (1) 0.142
>>>>>>> (2) -28672
>>>>>>> (3) 0.169
>>>>>>> (4) -28672
>>>>>>> (5) -28672
>>>>>>> (6) -28672
>>>>>>> (0) -----
>>>>>>> (0) 24.00322458681621 75.99551564353467
>>>>>>> (0) 0.171
>>>>>>> (1) 0.16
>>>>>>> (2) -28672
>>>>>>> (3) 0.17
>>>>>>> (4) -28672
>>>>>>> (5) -28672
>>>>>>> (6) -28672
>>>>>>>
>>>>>>> etc..etc..
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> regards
>>>>>>> Kunal Bali
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> ncl-talk mailing list
>>>>>>> ncl-talk at ucar.edu
>>>>>>> List instructions, subscriber options, unsubscribe:
>>>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>> _______________________________________________
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>>>>>
>>>>
>>>
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>
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