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diff --git a/src/de/lmu/ifi/dbs/elki/data/spatial/SpatialSingleMaxComparator.java b/src/de/lmu/ifi/dbs/elki/data/spatial/SpatialSingleMaxComparator.java
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+++ b/src/de/lmu/ifi/dbs/elki/data/spatial/SpatialSingleMaxComparator.java
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+package de.lmu.ifi.dbs.elki.data.spatial;
+
+/*
+ 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 java.util.Comparator;
+
+/**
+ * Comparator for sorting spatial objects by the maximum value in a single
+ * dimension.
+ * 
+ * @author Erich Schubert
+ * 
+ * @apiviz.uses SpatialComparable
+ */
+public class SpatialSingleMaxComparator implements Comparator<SpatialComparable> {
+  /**
+   * Current dimension.
+   */
+  int dim;
+
+  /**
+   * Constructor.
+   *
+   * @param dim Dimension to sort by.
+   */
+  public SpatialSingleMaxComparator(int dim) {
+    super();
+    this.dim = dim;
+  }
+
+  /**
+   * Set the dimension to sort by.
+   * 
+   * @param dim Dimension
+   */
+  public void setDimension(int dim) {
+    this.dim = dim;
+  }
+
+  @Override
+  public int compare(SpatialComparable o1, SpatialComparable o2) {
+    return Double.compare(o1.getMax(dim), o2.getMax(dim));
+  }
+}