polar.plot: Plot wind speed vs. direction
In chgrl/bReeze: Functions for Wind Resource Assessment

polar.plot

R Documentation

Plot wind speed vs. direction

Description

Plots wind speeds against directions in a polar plot.

Usage

polar.plot(mast, v.set=1, dir.set=1, subset, ...)
pol(mast, v.set=1, dir.set=1, subset, ...)

Arguments

`mast`	Met mast object created by `mast`.
`v.set`	Set used for wind speed values, specified as set number or set name.
`dir.set`	Set used for wind direction values, specified as set number or set name.
`subset`	Optional start and end time stamp for a data subset, as string vector `c(start, end)`. The time stamps format shall follow the rules of ISO 8601 international standard, e.g. "2012-08-08 22:55:00".
`...`	Optional graphical parameters, see below for details.

Optional graphical parameters

The following graphical parameters can optionally be added to customize the plot:

cex: Numeric value, giving the amount by which text on the plot should be scaled relative to the default (which is 1).
cex.axis: Amount by which axis annotations should be scaled, as numeric value.
cex.lab: Amount by which axis labels should be scaled, as numeric value.
cex.pts: Amount by which the plot symbols should be scaled, as numeric value.
circles: Manual definition of circles to be drawn, as numeric vector of the form c(inner circle, outer circle, interval between the circles).
col: The colour of the symbols plotted.
col.axis: Colour to be used for axis annotations – default is "gray45".
col.circle: Colour to be used for circles – default is "gray45".
col.cross: Colour to be used for axis lines – default is "gray45".
col.lab: Colour to be used for axis labels – default is "black".
fg: If TRUE, sectors are plotted in foreground (on top of axis lines and circles) – default is FALSE.
lty.circle: Line type of circles – default is "dashed". See par for available line types.
lty.cross: Line type of axis lines – default is "solid". See par for available line types.
lwd.circle: Line width of circles, as numeric value – default is 0.7.
lwd.cross: Line width of axis lines, as numeric value – default is 0.7.
pch: Either an integer specifying a symbol or a single character to be used as symbol – default is ".", which is drawn much faster than other symbols. See points for possible values and their interpretation.
pos.axis: Position of axis labels in degree, as numeric value – default is 60.

Author(s)

Christian Graul

Examples

## Not run: 
# load and prepare data
data("winddata", package="bReeze")
set40 <- set(height=40, v.avg=winddata[,2], dir.avg=winddata[,14])
set30 <- set(height=30, v.avg=winddata[,6], dir.avg=winddata[,16])
set20 <- set(height=20, v.avg=winddata[,10])
ts <- timestamp(timestamp=winddata[,1])
neubuerg <- mast(timestamp=ts, set40, set30, set20)
neubuerg <- clean(mast=neubuerg)

# plot v vs. dir
polar.plot(mast=neubuerg)
polar.plot(mast=neubuerg, v.set=3, dir.set=2)
polar.plot(mast=neubuerg, v.set="set3", dir.set="set2")	# same as above

# data subsets
polar.plot(mast=neubuerg, 
  subset=c("2009-12-01 00:00:00", "2009-12-31 23:50:00"))
polar.plot(mast=neubuerg,  
  subset=c("2010-01-01 00:00:00", NA)) # just 'start' time stamp
polar.plot(mast=neubuerg, 
  subset=c(NA, "2009-12-31 23:50:00")) # just 'end' time stamp

# customize plot
polar.plot(mast=neubuerg, cex.axis=1.2, cex.lab=1.5, cex.pts=0.8, 
  circles=c(10,20,5), col="red3", col.axis=gray(0.2), col.circle=gray(0.3), 
  col.cross=gray(0.3), col.lab=gray(0.2), fg=TRUE, lty.circle="dotted", 
  lty.cross="longdash", lwd.circle=1.2, lwd.cross=1.2, pch=1, pos.axis=135)

## End(Not run)

chgrl/bReeze documentation built on Feb. 10, 2024, 2:27 a.m.