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This package supports the parsing of AIS messages in Java. AIS, the Automatic Identification System, is a system aiming at improving maritime safety by exchanging messages between ships, other vehicles in particular aircraft involved in search-and-rescue (SAR), and (fixed) base stations. To be precise, this package support the ITU-R M.1371-4 AIS standard. See our extensive javadoc and in particular the class AISParser for more information on how to use this package. The parser was used in the Poseidon project, and is improved in the Metis project to better handle uncertain information. Both projects were led by the Embedded Systems Institute. In both projects Thales Nederlands was the carrying industrial partner, and multiple Dutch universities participated.

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package nl.esi.metis.aisparser;

/** This is the common interface for all types of AIS messages that provide position information. 
 * @author Pierre van de Laar
 */
public interface PositionInfo {
	/** Returns the position accuracy.
	 * @return a boolean value representing position accuracy: 

	 * true = high (≤ 10 m) 

	 * false = low (> 10 m)
	 */
	public boolean getPositionAccuracy();

	/** Returns the longitude in degrees.
	 * This value can be analyzed further with utility class {@link UtilsPositionInfo}.
	 * @return a double value representing the longitude in degrees (±180°, East = positive, West = negative; 181 not available).
	 */
	public double getLongitudeInDegrees();
	
	/** Returns the latitude in degrees.
	 * This value can be analyzed further with utility class {@link UtilsPositionInfo}.
	 * @return a double value representing the latitude in degrees (±90°, North = positive, South = negative; 91 not available).
	 */
	public double getLatitudeInDegrees();
}