Interface PrimeMeridian

All Superinterfaces:
IdentifiedObject
All Known Implementing Classes:
DefaultPrimeMeridian

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)
  • Method Details

    • getGreenwichLongitude

      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

      Unit<Angle> getAngularUnit()
      Returns the angular unit of the Greenwich longitude.
      Returns:
      The angular unit of greenwich longitude.