[ncl-talk] query ( CONVERSION ASCII TO NetCDF)
Kunal Bali
kunal.bali9 at gmail.com
Wed Sep 24 03:40:22 MDT 2014
Dear NCL users
With the help of NCL users Now i am able to convert ASCII to netcdf format.
But when i tried to plot this .nc file the contour map is not coming out in
proper way.
But when i use the original .nc file (without any conversion) then the plot
is coming nicely. Here is attached the file with figure and all commands
which i am using to plot.
Thank You
Kunal Bali
Research Scholar
Radio & Atmospheric Science Division
CSIR - National Physical Laboratory
New Delhi - 110012
On Wed, Sep 24, 2014 at 1:54 PM, Karin Meier-Fleischer <
meier-fleischer at dkrz.de> wrote:
> Hi Kunal,
>
> you read the data into an array called data with nlines=64800 and
> ncolumns=3 —> data(nlines,ncolumns)
>
> The 1st column, all lines: data(:,0)
> The 2nd column, all lines: data(:,1)
> The 3rd column, all lines: data(:,2)
>
> nLongitude = 360
> Longitude = data(0:nLongitude-1,1) —> read 2nd column, first 360 lines
>
> Please, take a look at
>
>
> http://www.ncl.ucar.edu/Document/Manuals/Getting_Started/basics.shtml#ArraySubscripting
>
> Bye,
> Karin
>
> Am 24.09.2014 um 07:10 schrieb Kunal Bali <kunal.bali9 at gmail.com>:
>
> Dear
> *Karin Meier-Fleischer*
>
> Thank You so much for helping me. Your run your scripts and working well.
> I just want know what is the means of this line > *Longitude = data(*
> 0:nLongitude-1
>
> *,1)*
>
> *Thank You*
>
> Kunal Bali
> Research Scholar
> Radio & Atmospheric Science Division
> CSIR - National Physical Laboratory
> New Delhi - 110012
>
>
>
>
>
>
> On Wed, Sep 24, 2014 at 1:01 AM, Karin Meier-Fleischer <
> meier-fleischer at dkrz.de> wrote:
>
>> Hi Kunal,
>>
>> one problems occurred while reading the datacaused by the variable name
>> TotCH4_A in the
>> header line of your data file 14-01.txt. NCL reads the value 4 in the
>> name and writes it as first
>> value into the data array. After renaming to TotCH_A in 14-01.txt file
>> everything works well.
>>
>> You missed to convert the one dimensional variable TotCH4_A (in your NCL
>> script) to a two
>> dimensional array. Also as described in the mails before you should
>> assign latitude and
>> longitude to the named variables of TotCH4_A2D. See the script below.
>>
>> It is easier to write/save the NCL commands in a text file (e.g.
>> script.ncl) and run it
>> using ’ncl script.ncl'
>>
>> Bye, Karin
>>
>>
>> ;-----------------------------------------------------------------------------
>> 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"
>>
>> begin
>>
>> nLatitude = 180
>> nLongitude = 360
>>
>> data = asciiread("14-01.txt",(/nLatitude*nLongitude,3/),"float")
>>
>> Latitude = data(::nLongitude,0)
>> Longitude = data(0:nLongitude-1,1)
>> TotCH4_A = data(:,2)
>> TotCH4_A2D = onedtond(TotCH4_A,(/nLatitude,nLongitude/))
>>
>> if (any(isnan_ieee(TotCH4_A2D))) then
>> value = 1.e20
>> replace_ieeenan (TotCH4_A2D, value, 0)
>> TotCH4_A2D at _FillValue = value
>> end if
>>
>> printMinMax(Latitude,0)
>> printMinMax(Longitude,0)
>> printMinMax(TotCH4_A,0)
>>
>> ; Assign named dimensions
>>
>> TotCH4_A2D!0 = "lat"
>> TotCH4_A2D!1 = "lon"
>>
>> ; Assign coordinate variables
>>
>> TotCH4_A2D&lat = Latitude
>> TotCH4_A2D&lon = Longitude
>>
>> TotCH4_A2D&lat at units = "degrees_north"
>> TotCH4_A2D&lon at units = "degrees_east"
>>
>> printVarSummary(TotCH4_A2D)
>>
>> ; delete existing netcdf file to create a new one
>> system("rm -rf Sample.nc")
>> ncdf = addfile("Sample.nc","c")
>>
>> ; write data to netcdf file
>>
>> ncdf->TotCH4_A = TotCH4_A2D
>>
>> ; plot data
>>
>> wks = gsn_open_wks("x11","test")
>> plot = gsn_csm_contour_map(wks,TotCH4_A2D,False)
>>
>> end
>>
>>
>> ;-----------------------------------------------------------------------------
>>
>>
>>
>> Am 23.09.2014 um 19:45 schrieb Kunal Bali <kunal.bali9 at gmail.com>:
>>
>> Here i attached scripts which i am trying to get the ascii to netcdf
>> conversion.
>>
>> Kunal Bali
>> Research Scholar
>> Radio & Atmospheric Science Division
>> CSIR - National Physical Laboratory
>> New Delhi - 110012
>>
>>
>>
>>
>>
>>
>> On Tue, Sep 23, 2014 at 11:03 PM, Karin Meier-Fleischer <
>> meier-fleischer at dkrz.de> wrote:
>>
>>> Hi Kunal,
>>>
>>> could you provide the data file and your script.
>>>
>>> Bye,
>>> Karin
>>>
>>>
>>> Am 23.09.2014 um 19:05 schrieb Kunal Bali <kunal.bali9 at gmail.com>:
>>>
>>> Dear NCL users
>>>
>>> I tried previous mail scripts for converting ASCII to netcdf format ,
>>> the file is generating but its without data points.Only variable names
>>> generating.
>>>
>>> Kunal Bali
>>> Research Scholar
>>> Radio & Atmospheric Science Division
>>> CSIR - National Physical Laboratory
>>> New Delhi - 110012
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Tue, Sep 23, 2014 at 1:28 PM, Karin Meier-Fleischer <
>>> meier-fleischer at dkrz.de> wrote:
>>>
>>>> Hi Kunal,
>>>>
>>>> the answer was given in an earlier mail:
>>>>
>>>> 1. read the ASCII data variable, lat and lon
>>>> 2. create a output file: netcdf = addfile("
>>>> simple.nc","c")
>>>> 3. write your data variable to the output file: ncdf->values = values
>>>>
>>>>
>>>> Please read the 'output to netcdf' examples for more details:
>>>> http://ncl.ucar.edu/Applications/o-netcdf.shtml
>>>>
>>>> Bye,
>>>> Karin
>>>>
>>>> Am 23.09.14 07:04, schrieb Kunal Bali:
>>>>
>>>> Dear NCL users
>>>>
>>>> I am still not getting how to do the conversion from ASCII to netcdf ??
>>>>
>>>> Kunal Bali
>>>> Research Scholar
>>>> Radio & Atmospheric Science Division
>>>> CSIR - National Physical Laboratory
>>>> New Delhi - 110012
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Mon, Sep 22, 2014 at 7:35 PM, Yuqiang Zhang <
>>>> yuqiangzhang.thu at gmail.com> wrote:
>>>>
>>>>> Hi Kunal,
>>>>>
>>>>>
>>>>> In line 30, “*ncl 30> TotCH4_A = data(:,2)* “. You variable
>>>>> “TotCH4_A” is only assigned one dimension’s value, so you can’t assign two
>>>>> dimension through line 33 & 34.
>>>>>
>>>>>
>>>>> Regards,
>>>>>
>>>>> Yuqiang
>>>>>
>>>>>
>>>>> *From:* ncl-talk-bounces at ucar.edu [mailto:ncl-talk-bounces at ucar.edu] *On
>>>>> Behalf Of *Kunal Bali
>>>>> *Sent:* Monday, September 22, 2014 8:53 AM
>>>>> *To:* Karin Meier-Fleischer
>>>>> *Cc:* ncl-talk at ucar.edu
>>>>> *Subject:* Re: [ncl-talk] query ( CONVERSION ASCII TO NetCDF)
>>>>>
>>>>>
>>>>> Dear NCL user
>>>>>
>>>>> I tried this script from NCL but still getting error
>>>>>
>>>>>
>>>>> ncl 28> Longitude = data(:,1)
>>>>> ncl 29> Latitude = data(:,0)
>>>>> ncl 30> TotCH4_A = data(:,2)
>>>>> ncl 31> ncdf = addfile("/home/kunal/simple1.nc","c")
>>>>> ncl 32> filedimdef(ncdf,"time",-1,True)
>>>>> ncl 33> TotCH4_A!0 = "Latitude"
>>>>> ncl 34> TotCH4_A!1 = "Longitude"
>>>>>
>>>>>
>>>>> *fatal:Variable (TotCH4_A) has (1) dimensions can not write to
>>>>> dimension (1) fatal:["Execute.c":8565]:Execute: Error occurred at or near
>>>>> line 34 *
>>>>>
>>>>>
>>>>> Kunal Bali
>>>>>
>>>>> Research Scholar
>>>>>
>>>>> Radio & Atmospheric Science Division
>>>>>
>>>>> CSIR - National Physical Laboratory
>>>>>
>>>>> New Delhi - 110012
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Mon, Sep 22, 2014 at 5:32 PM, Karin Meier-Fleischer <
>>>>> meier-fleischer at dkrz.de> wrote:
>>>>>
>>>>> Hi Kunal,
>>>>>
>>>>>
>>>>> Please, take a look at the 'output netcdf' examples page, method_1
>>>>>
>>>>>
>>>>> http://ncl.ucar.edu/Applications/method_1.shtml
>>>>>
>>>>> Try this:
>>>>>
>>>>>
>>>>>
>>>>> lat = data(:,0)
>>>>>
>>>>> lat = data(:,1)
>>>>>
>>>>> values= data(:,2)
>>>>>
>>>>> system <http://ncl.ucar.edu/Document/Functions/Built-in/system.shtml>("/bin/rm
>>>>> -f simple.nc") ; remove any pre-existing file
>>>>>
>>>>> ncdf = addfile("simple.nc" ,"c") ; output netCDF file
>>>>>
>>>>> filedimdef <http://ncl.ucar.edu/Document/Functions/Built-in/filedimdef.shtml>(ncdf,"time",-1,True) ; recommended
>>>>>
>>>>> values!0 = "lat"
>>>>>
>>>>> values!1 = "lon"
>>>>>
>>>>> values&lat = lat
>>>>>
>>>>> values&lon = lon
>>>>>
>>>>> ncdf->values = values
>>>>>
>>>>>
>>>>>
>>>>> Bye, Karin
>>>>>
>>>>>
>>>>>
>>>>> Am 22.09.2014 um 11:40 schrieb Kunal Bali <kunal.bali9 at gmail.com>:
>>>>>
>>>>> Dear NCL users
>>>>>
>>>>> I want to convert ASCII to .nc file format. Could any one please
>>>>> provides me the link for this query or give any detail about this ??
>>>>>
>>>>> I have data in 3 column ( Latitude Longitude Values)
>>>>>
>>>>> More Detail
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> *Variable: data Type: float Total Size: 777600 bytes
>>>>> 194400 values Number of Dimensions: 2 Dimensions and sizes: [64800] x
>>>>> [3] Coordinates: Number Of Attributes: 1 _FillValue : 9.96921e+36 *
>>>>>
>>>>> *So is there any ways to convert ASCII to netcdf format ???*
>>>>>
>>>>> *Thank You*
>>>>>
>>>>>
>>>>> Kunal Bali
>>>>>
>>>>> Research Scholar
>>>>>
>>>>> Radio & Atmospheric Science Division
>>>>>
>>>>> CSIR - National Physical Laboratory
>>>>>
>>>>> New Delhi - 110012
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> ncl-talk mailing list
>>>>> List instructions, subscriber options, unsubscribe:
>>>>> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
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>>>
>>> ____________________________________
>>> Dipl. Geophys. Karin Meier-Fleischer
>>> Visualisierung
>>> Abteilung Anwendungen
>>>
>>> Deutsches Klimarechenzentrum GmbH (DKRZ)
>>> Bundesstrasse 45a * D-20146 Hamburg
>>> Germany
>>>
>>> Phone: +49 (0)40 460094 126
>>> Fax: +49 (0)40 460094 270
>>> E-Mail: meier-fleischer at dkrz.de
>>> URL: http://www.dkrz.de/
>>>
>>> Geschäftsführer: Prof. Dr. Thomas Ludwig
>>> Sitz der Gesellschaft: Hamburg
>>> Amtsgericht Hamburg HRB 39784
>>>
>>>
>>>
>>>
>>>
>> <14-01.txt><ASCII to netcdf.ncl>
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