[gradsusr] Visualize Wind Vectors

[Nena Carina Española]

  Hi Arlindo,

I already saw that recipe and the data used there is annual. Mine's 
hourly. Can I use it with hourly data? If yes, is there something I need 
to change in my data to make the recipe work?

Thanks,

Nena


On Thursday, 21 October, 2010 09:48 AM, Arlindo da Silva wrote:
>
>
> 2010/10/20 Nena Carina Española <nena at asti.dost.gov.ph 
> <mailto:nena at asti.dost.gov.ph>>
>
>     Hi Daniele,
>
>     Thanks for the help.
>
>     I am still figuring out how to convert my station data into GrADS
>     binary as I am very new to GrADS. I already posted my problem
>     yesterday but nobody has answered it yet.
>     http://gradsusr.org/pipermail/gradsusr/2010-October/011667.html
>
>     I do not know how to create a binary with more than one surface
>     variable. I was able to create a binary for one variable only and
>     most examples I find use only one variable. Now I have three, and
>     data is hourly. Here's a sample:
>
>
> Have you seen this Recipe?
>
> http://cookbooks.opengrads.org/index.php?title=Recipe-005:_Creating_GrADS_binary_station_data_from_ASCII
>
>
>        Arlindo
>
>     YEAR    MO    DA    HO    STNID    LATITUDE     LONGITUDE    
>     PRESSURE  DIR    SPEED
>     2010    09    08    08    98132    20.800283    121.847534   
>     1012.3    160    12
>     2010    09    08    08    98133    19.283147    121.463012   
>     1008.5    120    8
>     2010    09    08    08    98134    20.454293    121.963806   
>     1009.2    140    12
>     2010    09    08    08    98222    17.582765    120.387268   
>     1008.1    220    4
>     2010    09    08    08    98223    18.185845    120.58239    
>     1006.6    250    10
>     2010    09    08    08    98232    18.360782    121.658935   
>     1009.5    90     4
>     2010    09    08    08    98233    17.629364    121.70288    
>     1008.1    0      0
>     2010    09    08    08    98324    15.328294    119.980087   
>     1007.2    270    2
>     2010    09    08    08    98325    16.051192    120.333195   
>     1007.3    360    4
>     2010    09    08    08    98327    16.607768    121.265259   
>     1007.5    190    4
>
>     Thanks again. :-)
>
>
>
>     On Friday, 15 October, 2010 05:52 PM, Daniele Gandini wrote:
>>     Hi Nena.
>>
>>     Here a simple formula to have U and V in m/s from wind speed (velv) and direction (dirv):
>>
>>       'set gxout barb'
>>       'd -velv*cos((dirv-90)/180*3.14);-velv*cos(dirv/180*3.14)'
>>
>>     To display these data with OACRES function first you must create a base grid file
>>     with a "dummy" constant value for example and then you can interpolate wind data:
>>
>>        'vel=oacres(dummy.1,velv.2,4,3,3,1)'
>>        'd vel'
>>        'runcbarn.gs  <http://cbarn.gs>'
>>
>>     Good luck.
>
>
>
>
>>     Daniele
>>
>>     ----- Messaggio originale -----
>>     Da: "Nena Carina Española"<nena at asti.dost.gov.ph>  <mailto:nena at asti.dost.gov.ph>
>>     A: "GrADS Users Forum"<gradsusr at gradsusr.org>  <mailto:gradsusr at gradsusr.org>
>>     Inviato: Venerdì, 15 ottobre 2010 5:32:26
>>     Oggetto: [gradsusr] Visualize Wind Vectors
>>
>>
>>     Hello Guys!
>>
>>     I am trying to create a visualization of the wind vectors. I am not sure where to begin as my data is not split into U and V components. Here's a snippet of the sample data I have. These are from 24 weather stations in the Philippines. Can I also interpolate these scattered data to create a gridded data using the OACRES function?
>>
>>
>>
>>     	Station ID 	Latitude 	Longitude 	Wind Speed (m/s) 	Wind Direction (degrees)
>>     	12 	15.721279 	121.522293 	0.8 	204
>>     	70 	7.135233 	124.814758 	2.21 	148
>>     	72 	6.960916 	126.212082 	6.34 	286
>>     	73 	9.282162 	123.244572 	9.6 	20
>>     	74 	8.997093 	124.883595 	1.54 	85
>>     	75 	9.217067 	124.713134 	3.84 	89
>>     Thanks,
>>
>>     Nena
>>
>>
>
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>     Email: nena at asti.dost.gov.ph <mailto:nena at asti.dost.gov.ph>
>
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>
>
>
> -- 
> Arlindo da Silva
> dasilva at alum.mit.edu <mailto:dasilva at alum.mit.edu>
>
>
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