org.opengis.referencing.datum
Interface PrimeMeridian

All Superinterfaces:
IdentifiedObject

@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
Version:
Abstract specification 2.0

Field Summary
 
Fields inherited from interface IdentifiedObject
ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
 
Method Summary
 Unit 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.
Unit:
Length

getAngularUnit

@UML(identifier="getAngularUnit",
     specification=OGC_01009)
Unit getAngularUnit()
Returns the angular unit of the Greenwich longitude.



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