oz.windrose: Display an Australian wind rose

In plotrix: Various Plotting Functions

Display an Australian wind rose

Description

Displays a wind rose in the style used by the Australian Bureau of Meteorology.

Usage

 oz.windrose(windagg,maxpct=20,wrmar=c(4,5,6,5),scale.factor=30,
  speed.col=c("#dab286","#fe9a66","#ce6733","#986434"),
  speed.width=NA,show.legend=TRUE,legend.pos=NA,...)

Arguments

windagg	A matrix of percentages with the rows representing speed ranges and the columns indicating wind directions.
maxpct	The maximum percentage displayed on the radial grid.
wrmar	Plot margins for the diagram.
scale.factor	The scale factor for the diagram.
speed.col	Colors representing speed ranges.
speed.width	Half widths of the bars representing speed ranges.
show.legend	Logical indicating whether to display a legend.
legend.pos	The vertical position of the wind rose legend. The Australian Bureau of Meteorology displays the legend at the top of the plot
...	additional arguments passed to ‘⁠plot⁠’.

Details

‘⁠oz.windrose⁠’ displays a wind rose in the style used by the Australian Bureau of Meteorology. Each limb represents a bin of wind directions, and there are conventionally eight bins. If ‘⁠windagg⁠’ has more than eight columns, more limbs will be displayed. The rows of ‘⁠windagg⁠’ represent the speed ranges used by the Australian Bureau of Meteorology (0, 0-10, 10-20, 20-30 and over 30 in km/hour). The diameter of the central circle is calculated as (percent calm observations)/(number of direction bins). The remaining grid circles are spaced from the circumference of the "Calm" circle.

Value

nil

Note

If a title is desired, remember to move the legend to the bottom of the plot. If the function is passed values that do not sum to 100, the resulting plot will at best be misleading.

Author(s)

Jim Lemon (thanks to Anna in the Sydney BoM office and Alejo for finding the problem with heavily prevailing winds.)

See Also

oz.windrose.legend, draw.circle, bin.wind.records

Examples

 windagg<-matrix(c(8,0,0,0,0,0,0,0,4,6,2,1,6,3,0,4,2,8,5,3,5,2,1,1,
  5,5,2,4,1,4,1,2,1,2,4,0,3,1,3,1),nrow=5,byrow=TRUE)
 oz.windrose(windagg)

plotrix documentation built on Nov. 10, 2023, 5:07 p.m.