org.deegree.commons.utils
Class SunInfo

java.lang.Object
  org.deegree.commons.utils.SunInfo

public class SunInfo
extends Object

The SunInfo supplies methods for the calculation of the sun position at a given time and latitude. The color of the sunlight may be requested as well.

Version:

$Revision: 18171 $, $Date: 2009-06-17 16:00:07 +0200 (Mi, 17 Jun 2009) $

Author:

Rutger Bezema, last edited by: $Author: mschneider $

Constructor Summary

SunInfo()
Constructs a sunposition at the current (local) time

SunInfo(Calendar calendar)
Constructs a sunposition with the given Calendar

SunInfo(int year, int month, int day, int hour, int minute)

Method Summary

float	calcSunlightIntensity(float[] color, float cloudFactor)
float[]	calculateSunlight(double latitude) This method calculates the color of the sunlight for the current time and the given latitude.
float[]	getEucledianPosition(double latitude) Get the euclidean position of the sun.
double	getHorizontalSunPosition() calculates the horizontal angle of the sun depending only on hour and minute!
double	getVerticalSunposition(double latitude) calculates the solar altitude for given latitude, year, month, date, hour and minute

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SunInfo

public SunInfo()

Constructs a sunposition at the current (local) time

SunInfo

public SunInfo(Calendar calendar)

Constructs a sunposition with the given Calendar

Parameters:

calendar - a given Calendar

SunInfo

public SunInfo(int year,
               int month,
               int day,
               int hour,
               int minute)

Parameters:

year -

month -

day -

hour -

minute -

Method Detail

getVerticalSunposition

public double getVerticalSunposition(double latitude)

calculates the solar altitude for given latitude, year, month, date, hour and minute

Parameters:

latitude - latitude of the the viewers position

Returns:

the solar altitude in radians for the given latitude

getHorizontalSunPosition

public double getHorizontalSunPosition()

calculates the horizontal angle of the sun depending only on hour and minute!

Returns:

the horizontal angle in radians

getEucledianPosition

public float[] getEucledianPosition(double latitude)

Get the euclidean position of the sun.

Parameters:

latitude -

Returns:

the euclidean position of the sun.

calculateSunlight

public float[] calculateSunlight(double latitude)

This method calculates the color of the sunlight for the current time and the given latitude. This method is taken from deegree2, the values are undocumented.

Parameters:

latitude -

Returns:

a the color of the sunlight for the given latitude.

calcSunlightIntensity

public float calcSunlightIntensity(float[] color,
                                   float cloudFactor)

Parameters:

color - to calculate the intensity for.

cloudFactor - scale factor [0,1] describing percentage of clouds covering the sun

Returns:

the intensity of the sunlight