stella.merit

Class MeridianTransitMerit

java.lang.Object

util.PropertyContainer

stella.merit.AbstractMerit

stella.merit.MeridianTransitMerit

All Implemented Interfaces:

Serializable, Cloneable, Meriting, PropertySupplying

public class MeridianTransitMerit
extends AbstractMerit

A merit calculating its gain from the actual distance of the meridian to the target, but using different law on the east and on the west side of the meridian. This is tailored to targets that should be observed close to the meridian, but have also a rather good pick probability if slighly to the west.

 gain(t) = w*exp(-tauˆ2/sˆs)
 

Here, w is the {link #KEY_IMPACT} factor and s is the KEY_STEEPNESS. The tau to the target must be provided in the parameter set handed over.

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Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static double	DEFIMPACT Default value for the priority impact.
private static String	DEFMERIDIAN Default airmass parameter name.
private static double	DEFSTEEPNESS Default value for the fwmh of the merit in hours.
static String	KEY_IMPACT The key linked to the impact of the meridian merit.
static String	KEY_MERIDIAN The key pointing to the name of the tau parameter.
static String	KEY_STEEPNESS The key linked to the steepness of the meridian merit.
private static long	serialVersionUID -5098097010916924029L

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

Constructors

Constructor and Description
MeridianTransitMerit(Map<String,String> prop) Constructs a new airmass merit, defaulting the KEY_IMPACT and the KEY_STEEPNESS parameters.

Method Summary

Modifier and Type	Method and Description
double	getMerit(GlobalGrouping set, Appointable target, Collection<Appointable> ignore, long span) Calculates the actual gain using the airmass of the target.

Methods inherited from class stella.merit.AbstractMerit

createMerit, getInitializer, initMerit

Methods inherited from class util.PropertyContainer

augment, augment, augment, augment, augment, clone, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, initProperties, isNew, parseObject, parseObject, reload, reload, removeProperty, requires, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

-5098097010916924029L

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Constant Field Values

KEY_IMPACT

public static final String KEY_IMPACT

The key linked to the impact of the meridian merit.

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Constant Field Values

KEY_STEEPNESS

public static final String KEY_STEEPNESS

The key linked to the steepness of the meridian merit.

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Constant Field Values

KEY_MERIDIAN

public static final String KEY_MERIDIAN

The key pointing to the name of the tau parameter.

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Constant Field Values

DEFIMPACT

private static final double DEFIMPACT

Default value for the priority impact.

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Constant Field Values

DEFSTEEPNESS

private static final double DEFSTEEPNESS

Default value for the fwmh of the merit in hours.

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Constant Field Values

DEFMERIDIAN

private static final String DEFMERIDIAN

Default airmass parameter name.

See Also:

Constant Field Values

Constructor Detail

MeridianTransitMerit

public MeridianTransitMerit(Map<String,String> prop)

Constructs a new airmass merit, defaulting the KEY_IMPACT and the KEY_STEEPNESS parameters. Proper creation should be done using the AbstractMerit.createMerit(java.util.Map<java.lang.String, java.lang.String>) method. This create method also takes care of proper parameter overloading.

Method Detail

getMerit

public double getMerit(GlobalGrouping set,
                       Appointable target,
                       Collection<Appointable> ignore,
                       long span)

Calculates the actual gain using the airmass of the target. The gain is higher if the airmass is low. The steepness of the gain decrease with airmass is governed with the KEY_STEEPNESS parameter.

Parameters:

set - Current observing conditions.

target - The actual target.

ignore - All targets, observable or not.

span - The relevant time span in ms.