PLOT_WINDROSE Procedure

Reference Guide > P Routines > PLOT_WINDROSE Procedure

Creates a Wind Rose plot.

Usage

PLOT_WINDROSE, startDate, endDate, dateArray, scalarArray, directionArray[, locationString]

Input Parameters

startDate — A Date/Time structure, which is the beginning date of the dateArray to plot.

endDate — A Date/Time structure, which is the final date of the dateArray to plot.

dateArray — A Date/Time structure array, which is the observation dates and times

scalarArray — A float array, usually the observed wind speeds, but can be any scalar (for example, pollutant concentration).

directionArray — A float array, which is the observed wind directions.

locationString — (optional) A string, which is the location.

Keywords

ScalarBins — An integer. This is the number of scalar bins. (Default = 6)

DirBins — An integer. This is the number of direction bins. (Default = 16)

NumCircles — An integer. This is the number of radial axis lines. (Default = 2)

NumSpokes — An integer. This is the number of axis lines around the plot. (Default = 12)

Titles — If nonzero, title strings (locationString, startDate and endDate) are drawn on the plot.

Legend — If nonzero, a wind speed legend is plotted.

CLegend — If nonzero, a scalar concentration legend is plotted.

Charsize — A float. This is the character size to use. (Default = !P.Charsize)

Format — A string. This is a FORTRAN format string for the legend values. (Default = '(F4.1)')

Foreground — An integer. This is the color to use for the axes. (Default =15, grey)

Backcolor — An integer. This is the background color. (Default = 0, black)

Textcolor — An integer. This is the color of the text. (Default = 1, white)

Outline — An integer. This is the color of the polygon outlines. (Default =1, white)

Color — An integer array, the colors to use for the scalar bins. It must have the "scalarBins" number of elements. (Default = [2,3,4,5,6,12])

Units — A string. This is the units for the legend. (Default = 'mph' for /Legend, 'ppm' for /CLegend)

XMax — A float, the value of duration percentage to use as the maximum radius of the plot. (Default = 1.1*largest bin).

Procedure

A circular axis is drawn and POLYFILL is used to create what is essentially a stacked polar bar chart.

Example 1

A traditional wind rose:

data = READ_AIRS(!Dir + '/demo/gallery3/data/wd_demo35.dat')

startdate = STR_TO_DT('1/1/99', Date_fmt=1)

enddate = STR_TO_DT('12/31/99', Date_fmt=1)

TEK_COLOR

l = (data('LOCATIONS'))(0)

PLOT_WINDROSE, startdate, enddate, data(l, 'DATE'), data(l, 'R S'), $

   data(l, 'R D'), data(l, 'LOCATION'), /Legend, /Titles, Charsize=1.2

Example 2

A pollution rose:

data = READ_AIRS(!Dir + '/demo/gallery3/data/wd_demo35.dat')

startdate = STR_TO_DT('1/1/99', Date_fmt=1)

enddate = STR_TO_DT('12/31/99', Date_fmt=1)

l = (data('LOCATIONS'))(0)

LOADCT, 8

clr = BYTSCL(INDGEN(6))

PLOT_WINDROSE, startdate, enddate, data(l, 'DATE'), $

   data(l, 'R S')*RANDOMU(seed, N_ELEMENTS(data(l, 'R S'))), $

   data(l, 'R D'), data(l, 'LOCATION'), /CLegend, /Titles, $

   Color=WoColorConvert(clr), Textcolor=WoColorConvert(clr(5)), $

   Foreground=WoColorConvert(clr(5)), Units='ppm', Charsize=1.2

Version 2017.1