arrowDir: Arrow direction fitting for Arrowhead function from "shape"...
In rWind: Download, Edit and Include Wind and Sea Currents Data in Ecological and Evolutionary Analysis

Description Usage Arguments Details Value Note Author(s) References See Also Examples

arrowDir adapts wind direction value to be used by Arrowhead function from "shape" package to plot wind direction for each coordinate.

1	arrowDir(W)

`W`	An object of class `rWind` or a data.frame which should content a column named "dir".

Angle argument of Arrowhead function from "shape" package needs to be fed in an anti-clockwise way, relative to x-axis, in degrees 0,360. arrowDir function adapts wind direction provided by wind.fit (clockwise, relative to y-axis ) to requirements of Arrowhead.

A vector with angles for each arrow to be plotted by Arrowhead.

arrowDir function works always together with Arrowhead function from "shape" package.

Javier Fernández-López

Karline Soetaert (2017). shape: Functions for Plotting Graphical Shapes, Colors. R package version 1.4.3. https://CRAN.R-project.org/package=shape

wind.dl

data(wind.data)

# Create a vector with wind direction (angles) adapted
alpha <- arrowDir(wind.data)
## Not run: 
# Now, you can plot wind direction with Arrowhead function from shapes package
# Load "shape package
require(shape)
plot(wind.data$lon, wind.data$lat, type = "n")
Arrowhead(wind.data$lon, wind.data$lat,
  angle = alpha,
  arr.length = 0.1, arr.type = "curved"
)

## End(Not run)