[ncl-talk] Wind Swath Calculation using NCL

[Sakib Ahmed]

Thank you, Dennis, for the suggestion!

On Mon, May 11, 2020 at 9:25 PM Dennis Shea <shea at ucar.edu> wrote:

> Oops:
>      print(WS)   ; all 287 values
> should be
>      print(ws(:,nl,ml))
>
> On Mon, May 11, 2020 at 1:52 PM Dennis Shea <shea at ucar.edu> wrote:
>
>> Looks correct to me.
>>
>> Keep in mind that satellite swath data can be quite noisy.
>>
>> You can do a simple test at one lat/lon location.
>>
>>   nl  = 600                       ; arbitrary ... your choice
>>   ml = 700                       ;     "                    "
>>
>>   ws_min  = *min*(ws(:,nl,ml))
>>   ws_max = *max*(ws(:,nl,ml)
>>
>>   print(WS)   ; all 287 values
>>   print("====")                         ; visual separator
>>   print("ws_min  ="+ws_min )
>>   print("ws_max ="+ws_max )
>>   print("swath="+swath(nl,ml))   ; should match 'ws_max'
>>
>> On Mon, May 11, 2020 at 1:16 PM Sakib Ahmed via ncl-talk <
>> ncl-talk at ucar.edu> wrote:
>>
>>> Dear NCL Community,
>>>
>>> I'm trying to calculate the maximum wind swath(maximum wind speed at
>>> each grid point for all the time steps) from a model output but after
>>> plotting, it doesn't look correct. It would be helpful if anyone can point
>>> me if there's anything wrong with the code that I'm using.
>>>
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>> begin
>>>
>>> f    = addfile("florence_wind.nc" ,"r" )   ; reading file
>>> ws = f->ws                                          ; reading variable
>>>
>>> printVarSummary(ws)
>>>
>>> Variable: ws
>>> Type: float
>>> Total Size: 1658634992 bytes
>>>             414658748 values
>>> Number of Dimensions: 3
>>> Dimensions and sizes:   [287] x [1202] x [1202]
>>> Coordinates:
>>> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;calculate
>>> swath;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>>>
>>> swath = dim_max_n(ws,0)   ; swath(nlat,nlon)
>>>
>>> printVarSummary(swath)
>>>
>>> Variable: swath
>>> Type: float
>>> Total Size: 5779216 bytes
>>>             1444804 values
>>> Number of Dimensions: 2
>>> Dimensions and sizes:   [1202] x [1202]
>>> Coordinates:
>>>
>>> end
>>>
>>> Thank you in advance for the help.
>>> Sakib
>>>
>>> Sakib Ahmed
>>> Connecticut College
>>> Environmental Studies Major,
>>> New London, CT 06320
>>>
>>>
>>> _______________________________________________
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>>> ncl-talk at ucar.edu
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>>
>>
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