Plot a Wind Rose Diagram

Generates a wind rose plot where the length of bars corresponds to the duration that wind is blowing from a direction and the color to the wind speed.

Usage

plot_wind_rose(wind_data)

Arguments

wind_data

A data frame containing summarized wind data. It must include:

direction

Wind direction in degrees (0-359), with NA indicating calm winds.

proportion

Proportion of time the wind blew from that direction (as a percentage, 0-100).

speed

Wind speed value to use for color fill.

Value

A ggplot2 object of the wind rose plot.

Details

The function filters out rows where direction is NA for the plot, but still uses them to calculate and display the percent of calm winds in the caption.

Wind direction labels are displayed as compass directions (N, E, S, W), and the plot is rendered in polar coordinates.

Examples

require(ggplot2)
#> Loading required package: ggplot2
set.seed(1)  # for reproducibility

# Create random wind data
n_directions = 16
wind_data <- data.frame(
  direction = c(NA, seq(0, 360,  length.out = n_directions+1)[-(n_directions+1)]),
  proportion = runif(n_directions + 1, min = 0.5, max = 5),
  speed = runif(n_directions + 1, min = 0.1, max = 5)
 ) %>%
 dplyr::mutate(proportion = proportion/sum(proportion)*100)

 wind_rose_plot <- plot_wind_rose(wind_data)

 # view the plot
 wind_rose_plot


 # can add your own labels with the
 wind_rose_plot +
  labs(
    title = "Wind at My Site",
    subtitle = "2000-2025",
    fill = "95th %tile wind speed"
   )


 # Change the color scale
 wind_rose_plot + scale_fill_continuous(type = 'viridis')