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diff --git a/src/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java b/src/de/lmu/ifi/dbs/elki/math/geodesy/WGS84SpheroidEarthModel.java
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+package de.lmu.ifi.dbs.elki.math.geodesy;
+
+/*
+ This file is part of ELKI:
+ Environment for Developing KDD-Applications Supported by Index-Structures
+
+ Copyright (C) 2013
+ Ludwig-Maximilians-Universität München
+ Lehr- und Forschungseinheit für Datenbanksysteme
+ ELKI Development Team
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import de.lmu.ifi.dbs.elki.utilities.Alias;
+import de.lmu.ifi.dbs.elki.utilities.optionhandling.AbstractParameterizer;
+
+/**
+ * The WGS84 spheroid earth model, without height model (so not a geoid, just a
+ * spheroid!)
+ * 
+ * Note that EGM96 uses the same spheroid, but what really makes the difference
+ * is it's geoid expansion.
+ * 
+ * Radius: 6378137.0 m
+ * 
+ * Flattening: 1 / 298.257223563
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.landmark
+ */
+@Alias({ "wgs84", "WGS-84", "WGS84" })
+public class WGS84SpheroidEarthModel extends AbstractEarthModel {
+  /**
+   * Static instance.
+   */
+  public static final WGS84SpheroidEarthModel STATIC = new WGS84SpheroidEarthModel();
+
+  /**
+   * Radius of the WGS84 Ellipsoid in m (a).
+   */
+  public static final double WGS84_RADIUS = 6378137.0; // m
+
+  /**
+   * Inverse flattening 1/f of the WGS84 Ellipsoid.
+   */
+  public static final double WGS84_INV_FLATTENING = 298.257223563;
+
+  /**
+   * Flattening f of the WGS84 Ellipsoid.
+   */
+  public static final double WGS84_FLATTENING = 1 / WGS84_INV_FLATTENING;
+
+  /**
+   * Constructor.
+   */
+  protected WGS84SpheroidEarthModel() {
+    super(WGS84_RADIUS, WGS84_RADIUS * (1 - WGS84_FLATTENING), WGS84_FLATTENING, WGS84_INV_FLATTENING);
+  }
+
+  /**
+   * Parameterization class.
+   * 
+   * @author Erich Schubert
+   * 
+   * @apiviz.exclude
+   */
+  public static class Parameterizer extends AbstractParameterizer {
+    @Override
+    protected WGS84SpheroidEarthModel makeInstance() {
+      return STATIC;
+    }
+  }
+}