diff --git a/src/main/java/org/orekit/rugged/api/ProjectionTypeId.java b/src/main/java/org/orekit/rugged/api/ProjectionTypeId.java
deleted file mode 100644
index efd8044a96840ae4e7ce121a59fa18e1b2ba0939..0000000000000000000000000000000000000000
--- a/src/main/java/org/orekit/rugged/api/ProjectionTypeId.java
+++ /dev/null
@@ -1,43 +0,0 @@
-/* Copyright 2013-2017 CS Systèmes d'Information
- * Licensed to CS Systèmes d'Information (CS) under one or more
- * contributor license agreements.  See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * CS licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License.  You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.orekit.rugged.api;
-
-
-/** Enumerate for cartographic projection type.
- * @author Lucie Labat-Allee
- * @since 2.0
- */
-public enum ProjectionTypeId {
-
-	/** Constant for WGS 84 projection type. */
-	WGS84,
-
-	/** Constant for UTM zone 1N projection type. */
-	UTM1N,
-
-	/** Constant for UTM zone 60N projection type. */
-	UTM60N,
-
-	/** Constant for UTM zone 1S projection type. */
-	UTM1S,
-
-	/** Constant for UTM zone 60S projection type. */
-	UTM60S,
-
-	/** Constant for Lambert-93 projection type. */
-	LAMBERT93
-}
diff --git a/src/tutorials/java/RefiningPleiades/metrics/DistanceTools.java b/src/tutorials/java/RefiningPleiades/metrics/DistanceTools.java
index e48c97fc716b75f4a993d9f8cfae68aefec8ad50..7265a7fd161b99b2269ff89a4db70442d46b7922 100644
--- a/src/tutorials/java/RefiningPleiades/metrics/DistanceTools.java
+++ b/src/tutorials/java/RefiningPleiades/metrics/DistanceTools.java
@@ -18,6 +18,7 @@ package RefiningPleiades.metrics;
 
 import org.hipparchus.geometry.euclidean.threed.Vector3D;
 import org.hipparchus.util.FastMath;
+import org.orekit.utils.Constants;
 
 /**
  * Class for computing geodetic distance.
@@ -28,10 +29,6 @@ import org.hipparchus.util.FastMath;
  */
 public class DistanceTools {
 
-    /** Earth radius in cms.  */
-	// TODO GP constant for earth ???
-    public static final double EARTH_RADIUS = 637100000d;
-
     /** Private constructor for utility class.
      */
     private DistanceTools() {
@@ -65,12 +62,11 @@ public class DistanceTools {
      */
     public static double computeDistanceInMeter(final double long1, final double lat1,
                                                 final double long2, final double lat2) {
-    	
+
         // get vectors on unit sphere from angular coordinates
         final Vector3D p1 = new Vector3D(lat1, long1); //
         final Vector3D p2 = new Vector3D(lat2, long2);
-
-        final double distance = EARTH_RADIUS / 100 * Vector3D.angle(p1, p2);
+        final double distance =  Constants.WGS84_EARTH_EQUATORIAL_RADIUS * Vector3D.angle(p1, p2);
         return distance;
     }