PrimeMeridian (Geotools modules 31-SNAPSHOT API)

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)

Field Summary
- Fields inherited from interface IdentifiedObject
  ALIAS_KEY, IDENTIFIERS_KEY, NAME_KEY, REMARKS_KEY

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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
```
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.