knots_to_speed {weathermetrics}

Convert from knots to standard units of wind speed

Description

knots_to_speed creates a numeric vector of speed, in units specified by unit, from a numeric vector of speed in knots.

Usage

knots_to_speed(knots, unit, round = 1)

Arguments

knots

Numeric vector of speeds in knots

unit

Character specifying the speed unit other than knots. Possible values are:

• mph: Miles per hour

• mps: Meters per second

• ftps: Feet per second

• kmph: Kilometers per hour

round

An integer indicating the number of decimal places to round the converted value.

Details

Output will be in the speed units specified by unit.

Value

A numeric vector of speeds (in the specified unit)

Note

Equations are from the source code for the National Oceanic and and Atmospheric Administration's online wind speed converter

Author(s)

Joshua Ferreri [e-mail], Brooke Anderson [e-mail]

References

http://www.srh.noaa.gov/epz/?n=wxcalc_windconvert

See Also

speed_to_knots

Examples

data(foco)
foco$mph <- knots_to_speed(foco$knots, unit = "mph", round = 0)
foco$mps <- knots_to_speed(foco$knots, unit = "mps", round = NULL)
foco$ftps <- knots_to_speed(foco$knots, unit = "ftps")
foco$kmph <- knots_to_speed(foco$knots, unit = "kmph")
foco