Foro de discusión y soporte para usuarios de R

Hola, tengo un archivo .nc con valores de velocidad de viento y debo representarlo para saber la dirección del viento. Pero me faltan los componentes x e y (u y v).
¿Alguna idea por donde empezar a "dibujar"?.
Muchas gracias de antemano. Este foro me ha ayudado a resolver bastantes dudas.

Os dejo un print del archivo:
dimensions:
        lon = 3 ;
        lat = 5 ;
        time = UNLIMITED ; // (96 currently)
variables:
        float lon(lon) ;
                lon:standard_name = "longitude" ;
                lon:long_name = "Longitude" ;
                lon:units = "degrees_east" ;
                lon:axis = "X" ;
        float lat(lat) ;
                lat:standard_name = "latitude" ;
                lat:long_name = "Latitude" ;
                lat:units = "degrees_north" ;
                lat:axis = "Y" ;
        double time(time) ;
                time:standard_name = "time" ;
                time:long_name = "Time" ;
                time:units = "hours since 1800-01-01 00:00:00" ;
                time:calendar = "standard" ;
        float wspd(lon, lat, time) ;
                wspd:long_name = "Monthly Mean Wind Speed at sigma level 0.995 from daily wind speed (from daily vector winds)" ;
                wspd:units = "m/s" ;
                wspd:_FillValue = 99999 ;
                wspd:missing_value = 99999 ;
                wspd:precision = 2 ;
                wspd:least_significant_digit = 1 ;
                wspd:var_desc = "Wind Speed" ;
                wspd:dataset = "CDC Derived NCEP Reanalysis Products" ;
                wspd:level_desc = "Surface" ;
                wspd:statistic = "Mean" ;
                wspd:parent_stat = "Other" ;
                wspd:actual_range = 0.509994521.33 ;

// global attributes:
                :CDI = "Climate Data Interface version 1.6.2 (http://code.zmaw.de/projects/cdi)" ;
                :Conventions = "COARDS" ;
                :history = "Wed Nov 26 10:45:57 2014: cdo ymonsub wind3.nc -ymonmean wind3.nc wind.nc
Wed Nov 26 10:45:57 2014: cdo setmissval,99999 wind2.nc wind3.nc
Fri Nov 07 12:47:46 2014: cdo seldate,2006-01-01,2013-12-01 wind1.nc wind2.nc
Fri Nov 07 12:20:04 2014: cdo sellonlatbox,-20.0,-15.0,30.0,20.0 wspd.nc wind1.nc
Thu May  4 20:11:50 2000: ncrcat -d time,0,623 /Datasets/ncep.reanalysis.derived/surface/wspd.mon.mean.nc wspd.mon.mean.nc
Mon Jul  5 23:54:34 1999: ncrcat ./wspd.mon.mean.nc /Datasets/ncep.reanalysis.derived/surface/wspd.mon.mean.nc /dm/dmwork/nmc.rean.ingest/combinedMMs/surface/wspd.mon.mean.nc
Oct 26 23:42:16 1995 from 4 time daily u,v wind speeds
created 99/04/15 by CAS (netCDF2.3)
Converted to chunked, deflated non-packed NetCDF4 2014/09" ;
                :description = "Data from NCEP initialized reanalysis (4x/day).  These are the 0.9950 sigma level values" ;
                :platform = "Model" ;
                :references = "http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.derived.html" ;
                :NCO = "20121012" ;
                :title = "monthly mean wspd.sig995 from the NCEP Reanalysis" ;
                :CDO = "Climate Data Operators version 1.6.2 (http://code.zmaw.de/projects/cdo)" ;
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