org.opengis.referencing.datum

Interface PrimeMeridian

All Superinterfaces:

IdentifiedObject

All Known Implementing Classes:

DefaultPrimeMeridian

@UML(identifier="CD_PrimeMeridian",
     specification=ISO_19111)
public interface PrimeMeridian
extends IdentifiedObject

A prime meridian defines the origin from which longitude values are determined. The name initial value is "Greenwich", and that value shall be used when the greenwich longitude value is zero.

Since:

GeoAPI 1.0

Author:

Martin Desruisseaux (IRD)

Field Summary

Fields inherited from interface IdentifiedObject

ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Method Summary

Modifier and Type	Method and Description
Unit<Angle>	getAngularUnit() Returns the angular unit of the Greenwich longitude.
double	getGreenwichLongitude() Longitude of the prime meridian measured from the Greenwich meridian, positive eastward.

Methods inherited from interface IdentifiedObject

getAlias, getIdentifiers, getName, getRemarks, toWKT

Method Detail

getGreenwichLongitude

@UML(identifier="greenwichLongitude",
     obligation=CONDITIONAL,
     specification=ISO_19111)
double getGreenwichLongitude()

Longitude of the prime meridian measured from the Greenwich meridian, positive eastward. The greenwichLongitude initial value is zero, and that value shall be used when the meridian name value is "Greenwich".

Returns:

The prime meridian Greenwich longitude, in angular unit.

getAngularUnit

@UML(identifier="getAngularUnit",
     specification=OGC_01009)
Unit<Angle> getAngularUnit()

Returns the angular unit of the Greenwich longitude.

Returns:

The angular unit of greenwich longitude.