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package ucar.unidata.geoloc;

/**
 * A location on the earth, specified by lat, lon and optionally altitude.
 * @author caron
 * @since Feb 18, 2008
 */
public interface EarthLocation {

  /**
   * latitude in decimal degrees north
   * @return latitude in decimal degrees north
   */
  public double getLatitude();

  /**
   * longitude in decimal degrees east
   * @return longitude in decimal degrees east
   */
  public double getLongitude();

  /**
   * altitude in meters;  missing = NaN.
   * LOOK: what is the reference surface ? for now assume mean sea level ???
   * @return altitude in meters;  missing = NaN.
   */
  public double getAltitude();

  /**
   * Get the lat/lon location
   * @return lat/lon location
   */
  public LatLonPoint getLatLon();

  /**
   * Are either lat or lon missing?
   * @return true if lat or lon is missing
   */
  public boolean isMissing();
}