# [ncl-talk] Wind Swath Calculation using NCL

Dennis Shea shea at ucar.edu
Mon May 11 19:25:35 MDT 2020

```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
>>
>> 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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>
>
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