1   /* Contributed in the public domain.
2    * Licensed to CS Systèmes d'Information (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.models.earth;
18  
19  import org.orekit.bodies.BodyShape;
20  import org.orekit.models.earth.ReferenceEllipsoid;
21  
22  /**
23   * All models of Earth's shape have some common properties that are not shared with
24   * arbitrary {@link BodyShape}s. In particular, an ellipsoidal (or spherical) model is
25   * used to compute latitude and longitude.
26   *
27   * @author Evan Ward
28   * @see #getEllipsoid()
29   */
30  public interface EarthShape extends BodyShape {
31  
32      /**
33       * Get the underlying ellipsoid model that defines latitude and longitude. If the
34       * height component of a {@link org.orekit.bodies.GeodeticPoint} is not needed,
35       * then using the ellipsoid will provide the quickest transformation.
36       *
37       * @return the reference ellipsoid. May be {@code this}, but never {@code null}.
38       */
39      ReferenceEllipsoid getEllipsoid();
40  
41  }