[ncl-talk] Not getting the original lat-lon label in contour map

[Dennis Shea]

You must study the excellent document by Karin and Michael Böttinger of DKRZ
<https://www.dkrz.de/>
  *http://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide/*
<http://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide/>

[1] You used *gsn_csm_contour* which contours the values *but does not draw
a map!*
                plot = gsn_csm_contour(wks,cv,res)
     You must use *gsn_csm_contour_map *to get a map background
                plot = gsn_csm_contour*_map*(wks,cv,res)

[2] Basic to NCL: the 'cv' variable **must* *have the lat/lon coordinates
associated with it.
     This is how the mapping knows where to plot the data.

Please *study* the attached. The printVarSummary are there for you to look
at the output.



On Thu, Dec 5, 2019 at 7:38 AM Atul Saini via ncl-talk <ncl-talk at ucar.edu>
wrote:

>
> *lat=a->latprintVarSummary(lat)*
>
> The above given code in ncl itself results into following detail, which
> contain the units and other things-
>
>
>
>
>
>
>
>
>
>
>
>
>
> *Variable: latType: floatTotal Size: 200 bytes            50 valuesNumber
> of Dimensions: 1Dimensions and sizes: [lat | 50]Coordinates:
> lat: [ 8..20.25]Number Of Attributes: 4  standard_name : latitude
> long_name : latitude  units : degrees_north  axis : Y*
>
> Regards,
>
>
>
>
>
> On Thu, Dec 5, 2019 at 7:59 PM Atul Saini <atulsainimail at gmail.com> wrote:
>
>> Hi dear Karin,
>>               I followed the same as suggested by you but it could not
>> result into expected output. On the other hand I did 'ncdump -h' on the
>> data file and it shows that data file contain the detail of unit of
>> coordinate variable. May be I am still doing mistake somewhere, please
>> suggest what should be done now, when setting lat lon unit do not work?
>>
>>
>> a=addfile("WesternAgroClimRegion_MonthlySum_1901_2017Jan.nc","r")
>> b=a->rf
>> lat at units = "degrees_north"
>> lon at units = "degrees_east"
>> aveg=dim_avg_n(b,0)
>> stdev=dim_stddev_n(b,0)
>> ;stdev = where(stdev.ne.0,stdev,stdev at _FillValue)
>> cv=(stdev/aveg)*100
>> ;*****************************************
>> ;create plot
>> ;*****************************************
>>   wks  = gsn_open_wks("png","CV_map")   ; send graphics to PNG file
>>   res                     = True          ; plot mods desired
>>   res at cnFillOn            = True          ; turn on color
>>   res at cnLinesOn           = False
>>   res at cnFillMode          = "RasterFill"       ; Raster Mode
>>   res at cnFillPalette       = "gui_default" ; set color map
>>   ;res at vpWidthF           = 0.5          ; change aspect ratio of plot
>>   ;res at vpHeightF          = 0.3
>>   res at gsnMaximize         = False          ; maximize plot size
>>   ;res at gsnDraw            = False
>>   ;res at gsnFrame           = False
>>   plot = gsn_csm_contour(wks,cv,res)       ; contour the variable
>>   frame(wks)
>>   end
>>
>> Regards,
>>
>>
>>
>>
>>
>> On Thu, Dec 5, 2019 at 7:16 PM Karin Meier-Fleischer via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> The lat and lon variables don't have a units attribute.
>>>
>>> lat at units = "degrees_north"
>>> lon at units = "degrees_east"
>>>
>>> -Karin
>>>
>>> Am 05.12.19 um 13:50 schrieb Atul Saini via ncl-talk:
>>>
>>> Hi NCL,
>>>               In spite of getting the real lat-lon label, I am getting
>>> the serial number of lat-lon. Please suggest the solution!
>>>
>>> Please find the script and data attached with this mail.
>>> Thanks in advance.
>>>
>>> Regards,
>>>
>>>
>>>
>>>
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