Revision 794 org.gvsig.proj/branches/refactor2018/org.gvsig.proj/org.gvsig.proj.catalog/org.gvsig.proj.catalog.api/src/main/java/org/gvsig/proj/catalogue/datum/PrimeMeridian.java

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PrimeMeridian.java
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/**
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 * A prime meridian defines the origin from which longitude values are determined.
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 * Most geodetic datums use Greenwich as their prime meridian.
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 *
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 * <p>Constraints:</p>
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 * <ul>
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 *   <li>If the prime meridian {@linkplain #getName() name} is "Greenwich" then the value of
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 *       {@linkplain #getGreenwichLongitude() Greenwich longitude} shall be 0 degrees.</li>
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 *   <li>Conversely if the Greenwich longitude value is zero, then the prime meridian name
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 *       shall be "Greenwich".</li>
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 * </ul>
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 *
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 * Note: gvSIG derived these interfaces from GeoAPI in order to have a simpler API and also to
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 * avoid namespace collisions (e.g. GeoAPI 3 vs GeoTools interfaces). There is no plans
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 *
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 * @author  gvSIG Team
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 * @author  Martin Desruisseaux (IRD)
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 * @version 3.0.1
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 * @since   1.0
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 *
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 * @see DatumAuthorityFactory#createPrimeMeridian(String)
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 * @see DatumFactory#createPrimeMeridian(Map, double, Unit)
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 */
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public interface PrimeMeridian {
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    /**
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     * A common name for this primer meridian
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     *
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     * @return the name, or {@code null} if none.
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     */
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	String getName();
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    /**
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     * Longitude of the prime meridian measured from the Greenwich meridian, positive eastward.
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     * The {@code greenwichLongitude} default value is zero, and that value shall be used
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     * when the {@linkplain #getName() meridian name} value is "Greenwich".
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    /**


  		




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     * Returns the angular unit of the {@linkplain #getGreenwichLongitude() Greenwich longitude}.


  		




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     *


  		




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     * @departure historic


  		




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     *   This attribute is inherited from an older OGC specification.


  		




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     *   In ISO 19111, <code>greenwichLongitude</code> is a property of type <code>Angle</code>


  		




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     *   rather than <code>double</code>, and the unit of measure is part of the <code>Angle</code> value.


  		




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     *


  		




  
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     * 


  		




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     * @return the angular unit of Greenwich longitude.


  		




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     */


  		




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    Unit<Angle> getAngularUnit();


  		












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