Re: ِAscii data coordinate adjusting

From: ahmed lasheen <ahmed4kernel_at_nyahnyahspammersnyahnyah>
Date: Mon Feb 28 2011 - 13:17:10 MST

thanks it works now

On Mon, Feb 28, 2011 at 9:54 PM, Dave Allured <dave.allured@noaa.gov> wrote:

> Ahmed,
>
> The 8 statements from example 2 are added to the program that you already
> have. Insert the 8 new statements after "vwnd = new (...)" in your original
> program. Then change the name "z" to "vwnd", in 6 lines. For example:
>
> vwnd!0 = "lat"
>
> Etc.
>
>
> --Dave
>
> On 2/26/2011 5:06 PM, ahmed lasheen wrote:
>
>> Hello,
>> thanks for your reply
>> if i use the fspan so i have to get ride of the do loop , but how
>> can i fill the
>> vwnd array with the data.
>>
>> On Sun, Feb 27, 2011 at 1:44 AM, Dave Allured <dave.allured@noaa.gov
>> <mailto:dave.allured@noaa.gov>> wrote:
>>
>> You need to generate proper coordinate variables for latitude
>> and longitude, and attach them to your data variable "vwnd".
>> This method is shown in example 2 on this page:
>>
>>
>> http://www.ncl.ucar.edu/Document/Functions/Built-in/generate_2d_array.shtml
>>
>> Use *only* the 8 program statements following this comment:
>> "Generate 1D lat/lon coord arrays and attach to data." lat1,
>> lat2, lon1, lon2 are placed within the two fspan function calls.
>>
>> Also, it is good practice to set the following variables at the
>> top of your program, and never use explicit constants after
>> these statements:
>>
>> nx = 144
>> ny = 73
>> lat1 = ...
>> lat2 = ...
>> lon1 = ...
>> lon2 = ...
>>
>> --Dave
>>
>>
>> On 2/26/2011 4:06 PM, ahmed lasheen wrote:
>>
>> Hello
>> I have NC file which contain data about wind , and i wish to
>> make
>> some calculation on it so i have print
>> to ASCII file and then plot it to ensure that i am reading
>> it correctly , but when i plot it i found that there is a
>> shifting
>> in the
>> plot(the north is in the south , and the east is in the
>> west) .i
>> have attached both the original plot from plotting the nc file
>> itself and the image of plotting the ASCII file .
>> i don not know how to tell ncl that the data is from lat1 to
>> lat2
>> and lon2 to lon2 specifically.
>> Here is the ncl code
>> *load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"*
>> *load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"*
>> *;*************************************************
>> *begin*
>> *;*************************************************
>> *; read in netCDF file*
>> *;*************************************************
>> * a = asciiread("vdata_ncl",(/10512,1/),"float")*
>> *;*************************************************
>> *; read in zonal winds*
>> *;*************************************************
>> *vwnd = new ( (/73,144/), "float") ;; this is fantastic*
>> *i=0*
>> * do lat=0,72*
>> * do lon=0,143*
>> * vwnd(lat,lon)=a(i,0)*
>> * i=i+1*
>> * end do*
>> * end do*
>> *
>> *
>> * res = True*
>> * res@cnFillOn = True*
>> * res@gsnSpreadColors = True*
>> * res@tfDoNDCOverlay = True*
>> *;*************************************************
>> *; create default plot*
>> *;*************************************************
>> *wks = gsn_open_wks("png","ascii") ; open a ps
>> file*
>> *gsn_define_colormap(wks,"BlAqGrYeOrRe") ; choose colormap*
>> *plot2 = gsn_csm_contour_map_ce(wks,vwnd(:,:),res) ; create a
>> default plot*
>> *end*
>>
>> I have also attached the ASCII file data.
>> thanks in advance
>>
>> --
>> ===============
>> Ahmed Lasheen
>> Junior researcher at Cairo Numerical Weather Prediction
>> Center (CNWPC)
>> Egyptian Meteorological Authority(EMA)
>> Cairo,Egypt
>> ===============
>>
>>
>> nc.000001.png
>>
>>
>>
>> ascii.000001.png
>>
>>
>>
>>
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>>
>>
>>
>> --
>> ===============
>> Ahmed Lasheen
>> Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
>> Egyptian Meteorological Authority(EMA)
>> Cairo,Egypt
>> ===============
>>
>>

-- 
===============
Ahmed Lasheen
Junior researcher at Cairo Numerical Weather Prediction Center (CNWPC)
Egyptian Meteorological Authority(EMA)
Cairo,Egypt
===============

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Received on Mon Feb 28 13:18:08 2011

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