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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2011, Open Source Geospatial Foundation (OSGeo)
 *    (C) 2003-2005, Open Geospatial Consortium Inc.
 *
 *    All Rights Reserved. http://www.opengis.org/legal/
 */
package org.opengis.referencing.crs;

import static org.opengis.annotation.Obligation.*;
import static org.opengis.annotation.Specification.*;

import org.opengis.annotation.UML;
import org.opengis.referencing.datum.EngineeringDatum;

/**
 * A contextually local coordinate reference system. It can be divided into two broad categories:
 *
 * 
 *
 * 

 *   earth-fixed systems applied to engineering activities on or near the surface of the earth;
 *   
CRSs on moving platforms such as road vehicles, vessels, aircraft, or spacecraft.
 * 
 *
 * Earth-fixed Engineering CRSs are commonly based on a simple flat-earth approximation of the
 * earth's surface, and the effect of earth curvature on feature geometry is ignored: calculations
 * on coordinates use simple plane arithmetic without any corrections for earth curvature. The
 * application of such Engineering CRSs to relatively small areas and "contextually local" is in
 * this case equivalent to "spatially local".
 *
 * 
Engineering CRSs used on moving platforms are usually intermediate coordinate reference
 * systems that are computationally required to calculate coordinates referenced to {@linkplain
 * GeocentricCRS geocentric}, {@linkplain GeographicCRS geographic} or {@linkplain ProjectedCRS
 * projected} CRSs. These engineering coordinate reference systems are subject to all the motions of
 * the platform with which they are associated. In this case "contextually local" means that the
 * associated coordinates are meaningful only relative to the moving platform. Earth curvature is
 * usually irrelevant and is therefore ignored. In the spatial sense their applicability may extend
 * from the immediate vicinity of the platform (e.g. a moving seismic ship) to the entire earth
 * (e.g. in space applications). The determining factor is the mathematical model deployed in the
 * positioning calculations. Transformation of coordinates from these moving Engineering CRSs to
 * earth-referenced coordinate reference systems involves time-dependent coordinate operation
 * parameters.
 *
 * 
 * 
 * Used with CS type(s)

 *   {@link org.opengis.referencing.cs.AffineCS           Affine},
 *   {@link org.opengis.referencing.cs.CartesianCS        Cartesian},
 *   {@link org.opengis.referencing.cs.EllipsoidalCS      Ellipsoidal},
 *   {@link org.opengis.referencing.cs.SphericalCS        Spherical},
 *   {@link org.opengis.referencing.cs.CylindricalCS      Cylindrical},
 *   {@link org.opengis.referencing.cs.PolarCS            Polar},
 *   {@link org.opengis.referencing.cs.VerticalCS         Vertical},
 *   {@link org.opengis.referencing.cs.LinearCS           Linear}
 * 
 *
 * @version Abstract
 *     specification 2.0
 * @author Martin Desruisseaux (IRD)
 * @since GeoAPI 1.0
 */
@UML(identifier = "SC_EngineeringCRS", specification = ISO_19111)
public interface EngineeringCRS extends SingleCRS {
    /** Returns the datum, which must be an engineering one. */
    @UML(identifier = "usesDatum", obligation = MANDATORY, specification = ISO_19111)
    EngineeringDatum getDatum();
}