NCL Home > Documentation > Functions > Graphics routines

WindRoseColor

Plot a wind rose diagram where different colors are used to differentiate speed ranges.

Prototype

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"  ; This library is automatically loaded 
                                                          ; from NCL V6.2.0 onward.
                                                          ; No need for user to explicitly load.

load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/wind_rose.ncl" ; Still need to load this library.

	function WindRoseColor (
		wks          : graphic,  
		wspd         : numeric,  
		wdir         : numeric,  
		numPetals    : integer,  
		circFr       : float,    
		spdBounds    : float,    
		colorBounds  : string,   
		res          : graphic   
	)

	return_val  :  graphic

Arguments

wks

A Workstation identifier. The identifier is one returned either from calling gsn_open_wks or calling create to create a Workstation object.

wspd

A one-dimensional array of wind speeds (any units).

wdir

A one-dimensional array of wind directions (degrees). The wind directions are meteorological; that is, 90 degrees means blowing from the east.

numPetals

Number of wind rose directions.

circFr

Intervals at which frequency circles are drawn.

spdBounds

Speed bounds for different colors.

colorBounds

Colors for each spdBounds interval.

res

A variable containing an optional list of plot resources, attached as attributes. Set to True if you want the attached attributes to be applied, and False if you either don't have any resources to set, or you don't want the resources applied. The most common resource to set is the figure title tiMainString.

Return value

A plot identifier of the wind rose is returned.

Description

This function creates a wind rose (i.e., a frequency of wind direction plus average speed). Different wind speed ranges are indicated via different colors.

Examples