plotrix (version 3.8-4)

oz.windrose: 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,...)

Value

nil

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.

Author

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

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.

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)