climatol (version 4.0.0)

windrose: Wind-rose plot

Description

This function plots a wind-rose from a data frame with columns DateTime, Wind direction and Wind speed.

Usage

windrose(dat, cols=1:3, code='', name='', uni='m/s', maxnsc=8, fnum=4, fint=5,
flab=2, pal=c('cyan','yellow','orange','red','brown'), ang=-3*pi/16,
margin=c(0,0,4,0), ...)

Value

The table of wind frequencies by direction and speed classes is returned invisibly.

Arguments

dat

Data frame with columns DateTime, Wind direction and Wind speed.

cols

Columns containing DateTime, Wind direction and Wind speed [1:3].

code

Station code.

name

Station name.

uni

Speed units for the legend header ['m/s'].

maxnsc

Maximum number of wind speed classes [8].

fnum

Number of reference circles to plot [4].

fint

Frequency interval (in %) between reference circles [5].

flab

Parameter indicating which circles must be labelled:

1:

Label outer circle only,

2:

Label all circles (the default),

Other value:

Do not label any circle.

pal

Color gradation to fill the frequency polygons.

ang

Angle along which circles will be labeled, in radians [-3*pi/16].

margin

Margins vector for the plot (to be passed to par) [c(0,0,4,0)].

...

Other graphic parameters.

Details

After reading the data, a frequency table is calculated in 16 wind directions and a variable number of wind speed classes. The wind direction data must be provided in degrees.

This table, which covers all available pairs of wind direction and speed present in the data frame, is the basis of the wind-rose plot.

Examples

data(climatol_data) #load example data
windtable <- windrose(AWS_1year, 1:3, 'st123', 'My airport') #plot windrose
print(windtable) #display the table of calculated wind frequencies