Feathers

uv = [0.0 0 2.0; 0.0 30 2; 0.0 60 2; 0.0 90 2; 0.0 120 2; 0.0 150 2; 0.0 180 2; 0.0 210 2; 0.0 240 2; 0.0 270 2; 0.0 300 2; 0.0 330 2; 0.0 360 2]

using GMT
uv = [0.0 0 2.0; 0.0 30 2; 0.0 60 2; 0.0 90 2; 0.0 120 2; 0.0 150 2; 0.0 180 2; 0.0 210 2; 0.0 240 2; 0.0 270 2; 0.0 300 2; 0.0 330 2; 0.0 360 2];
feather(uv, rtheta=true, aspect="1:1", arrow=(len=0.5, shape=0.5,),
        lw=0.5, fill=:green, show=true)

Simple arrows and in function of number of arrows.

using GMT
t = -pi/2:pi/8:pi/2; u = 10*sin.(t); v = 10*cos.(t);
feather(u,v, show=true)

Show the data used in this example.

using GMT, PrettyTables   # hide
getpath4docs(file::String) = joinpath("..", "..", "..", "..", "..", file) # hide
io = IOBuffer() # hide
D = gmtread(TESTSDIR * "assets/wind_faro_s.dat")
PrettyTables.pretty_table(io, D.data; header=D.colnames, backend=Val(:html))    # hide
println("~~~" * String(take!(io)) * "~~~") # hide

Create a winbarb plot. Note that since the data has 4 columns we must select the 3 that we want to use in the plot. We select the columns from teir names in the D GMTdataset.

using GMT
resetGMT()      # hide
feather(TESTSDIR * "assets/wind_faro.dat", xvar=:Time, yvar=[:azimuth, :vmean],
        rtheta=true, nohead=1, lw=0.1, show=true)