PrimeMeridian

All Superinterfaces:: IdentifiedObject

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

Definition of the origin from which longitude values are determined. Most geodetic reference frames use Greenwich as their prime meridian.

Since:

1.0

See Also:

Field Summary

Fields inherited from interface org.opengis.referencing.IdentifiedObject
ALIAS_KEY, DOMAINS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY
Method Summary

Modifier and Type

Method

Description

javax.measure.Unit<javax.measure.quantity.Angle>

getAngularUnit()

Returns the angular unit of the Greenwich longitude.

double

getGreenwichLongitude()

Longitude of the prime meridian measured from the internationally-recognized reference meridian, positive eastward.

Methods inherited from interface org.opengis.referencing.IdentifiedObject
getAlias, getDomains, getIdentifiers, getName, getRemarks, toWKT

Method Details
- getGreenwichLongitude
  
  @UML(identifier="greenwichLongitude", obligation=MANDATORY, specification=ISO_19111) double getGreenwichLongitude()
  
  Longitude of the prime meridian measured from the internationally-recognized reference meridian, positive eastward. If the meridian name is "Greenwich", then this value shall be zero.
  
  Returns:
  
  the prime meridian Greenwich longitude, in angular unit.
  
  Unit:
  
  Angle
- getAngularUnit
  
  @UML(identifier="getAngularUnit", specification=OGC_01009) javax.measure.Unit<javax.measure.quantity.Angle> getAngularUnit()
  
  Returns the angular unit of the Greenwich longitude.
  
  Returns:
  
  the angular unit of Greenwich longitude.
  
  Departure from OGC/ISO standard for historical reason
  This attribute is inherited from an older OGC specification. In ISO 19111, greenwichLongitude is a property of type Angle rather than double, and the unit of measure is part of the Angle value.