[ncl-talk] convert_to_netcdf

Wed Nov 22 11:17:22 MST 2017

How closely did you look at your ascii data file?

Did you look at the values?

Really, How is anybody going to determine what you are doing? It is just a
bunch of numbers. Here is a start for *you*

=== data file
ncols  241
nrows  291
xllcenter  91.33
yllcenter  5.00
cellsize  0.1
NODATA_value  -999
133.0 136.0 138.0 .....

===

  data = asciiread("/home/kunal/20040101.asc", -1,"float")
  nData= dimsizes(data)
  printVarSummary(data)
  print("nData="+nData)
  print("---")

  nCols = toint(data(0))       ; ncols
  nRows= toint(data(1))     ; nrows
  nPts      = nCols*nRows
  print("nCols="+nCols+"  nRows="+nRows+"  nPts="+nPts)
  print("---")

  xllcenter = data(2)
  yllcenter = data(3)
  cellsize  = data(4)
  data at _FillValue = data(5)
  values    = data(6:)            ; lat and lon mixed????
  print(values)
  printMinMax(values,0)

On Tue, Nov 21, 2017 at 10:55 PM, Kunal Bali <kunal.bali9 at gmail.com> wrote:

> I tried to convert ascii format (attached previous mail) to netcdf by the
> script given below.
> The script is generating the netcdf file but the lat lon dimensions did
> not correctly assign.
>
>
> please let me know how to correct this script.
>
>
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>
> begin
>
>   nLatitude = 241
>   nLongitude = 291
>
>   data = asciiread("/Users/Pushp/Desktop/COD_NEW/PM2.5/in.txt",
> (/nLatitude*nLongitude/),"float")
>   printVarSummary(data)
>
>   Latitude  = data(:nLatitude-1)
>   Longitude = data(:nLongitude-1)
>   printVarSummary(Latitude )
>   printVarSummary(Longitude)
>
>   CF  = data(:)
>   CF2D = onedtond(CF,(/nLatitude,nLongitude/))
>
>   printVarSummary(CF2D)
>
>   if (any(isnan_ieee(CF2D))) then
>     value = 1.e20
>     replace_ieeenan (CF2D, value, 0)
>     CF2D at _FillValue = value
>   end if
>
>  ; printMinMax(Latitude,0)
> ;  printMinMax(Longitude,0)
>   printMinMax(CF2D,0)
>
> ; Assign named dimensions
>
>   CF2D!0 = "lat"
>   CF2D!1 = "lon"
>
> ; Assign coordinate variables
>
>   CF2D&lat = Latitude
>   CF2D&lon = Longitude
>
>   CF2D&lat at units = "degrees_north"
>   CF2D&lon at units = "degrees_east"
>
>   printVarSummary(CF)
> ; delete existing netcdf file to create a new one
>   system("rm -rf test.nc")
>   ncdf = addfile("/Users/Pushp/Desktop/COD_NEW/PM2.5/test.nc","c")
>
> ; write data to netcdf file
>
>   ncdf->CF = CF2D
>
> end
>
>
>
>
>
> regards
> Kunal Bali
>
>
>
>
>
>
> On Tue, Nov 21, 2017 at 6:29 PM, Kunal Bali <kunal.bali9 at gmail.com> wrote:
>
>> I tried to convert ascii to netcdf with the attached script, but not able
>> to get the result.
>>
>>
>> regards
>> Kunal Bali
>>
>>
>>
>>
>>
>> On Mon, Nov 20, 2017 at 9:47 PM, Douglas Lowe <
>> Douglas.Lowe at manchester.ac.uk> wrote:
>>
>>> Dear Kunal Bali,
>>>
>>> It is definitely possible - the UK nation emissions data is provided in
>>> a similar csv text format to the file you attached, and I have previously
>>> converted this to netcdf format using NCL.
>>>
>>> You need to use the readAsciiHead function to read the header, and then
>>> the readAsciiTable function to read the table (using the parameters that
>>> you have gained from reading the header information). Once you have the
>>> data in a 2D array then it can be written into a netcdf file, after you've
>>> defined the file.
>>>
>>> My scripts wont be directly applicable to your task (as they also
>>> conversion of BNG coordinates to longitude & latitude coordinates), but if
>>> you would like to use them as a template to guide you in writing your
>>> scripts then email me, and I'd be happy to send you a copy.
>>>
>>> Regards,
>>> Doug
>>>
>>> ----------------------------------------------------------------------
>>>
>>> Message: 1
>>> Date: Mon, 20 Nov 2017 21:13:08 +0530
>>> From: Kunal Bali <kunal.bali9 at gmail.com>
>>> To: "ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
>>> Subject: [ncl-talk] convert_to_netcdf
>>> Message-ID:
>>>         <CAOiHCtRKsHCjTnje+28ntzjMObLiVt5j9U5Xst3DUrVQDjyWQg at mail.gm
>>> ail.com>
>>> Content-Type: text/plain; charset="utf-8"
>>>
>>> Dear NCL users,
>>>
>>> Is it possible to convert attached .asc file format to netcdf? It seems
>>> like CDL format?
>>>
>>> Could anyone please let me know that?
>>>
>>>
>>> regards
>>> Kunal Bali
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>>> ncols  241
>>> nrows  291
>>> xllcenter  91.33
>>> yllcenter  5.00
>>> cellsize  0.1
>>> NODATA_value  -999
>>> 133.0 136.0 138.0 141.0 144.0 147.0 150.0 152.0 155.0 157.0 159.0 162.0
>>> 164.0 167.0 159.0 147.0 135.0 123.0 111.0 98.0 86.0 84.0 81.0 79.0 76.0
>>> 74.0 71.0 70.0 70.0 70.0 71.0 71.0 72.0 72.0 84.0 101.0 118.0 134.0 151.0
>>> 168.0 185.0 197.0 209.0 222.0 234.0 246.0 258.0 266.0 266.0 266.0 266.0
>>> 265.0 265.0 265.0 254.0 237.0 221.0 204.0 188.0 171.0 155.0 156.0 158.0
>>> 160.0 161.0 163.0 164.0 165.0 162.0 159.0 156.0 153.0 150.0 147.0 144.0
>>> 140.0 137.0 133.0 130.0 126.0 123.0 120.0 117.0 114.0 111.0 ......
>>> ------------------------------
>>>
>>> Subject: Digest Footer
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>>> ------------------------------
>>>
>>> End of ncl-talk Digest, Vol 168, Issue 44
>>> *****************************************
>>>
>>
>>
>
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