diff --git a/rugged-api/src/main/java/org/orekit/rugged/api/GroundPoint.java b/rugged-api/src/main/java/org/orekit/rugged/api/GroundPoint.java
new file mode 100644
index 0000000000000000000000000000000000000000..695036683d9fd6a392047e03b9c6c37089759f18
--- /dev/null
+++ b/rugged-api/src/main/java/org/orekit/rugged/api/GroundPoint.java
@@ -0,0 +1,91 @@
+/* Copyright 2013-2014 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;
+
+import java.io.Serializable;
+
+import org.apache.commons.math3.util.FastMath;
+import org.apache.commons.math3.util.MathUtils;
+
+/** Container for ground point.
+ * <p>
+ * This class is a stripped-down version of Orekit {@link org.orekit.bodies.GeodeticPoint},
+ * which is distributed under the terms of the Apache License V2.
+ * </p>
+ * <p>
+ * Instances of this class are guaranteed to be immutable.
+ * </p>
+ * @author Luc Maisonobe
+ */
+public class GroundPoint implements Serializable {
+
+ /** Serializable UID. */
+ private static final long serialVersionUID = 20140309L;
+
+ /** Latitude of the point (rad). */
+ private final double latitude;
+
+ /** Longitude of the point (rad). */
+ private final double longitude;
+
+ /** Altitude of the point (m). */
+ private final double altitude;
+
+ /**
+ * Build a new instance. The angular coordinates will be normalized so that
+ * the latitude is between ±π/2 and the longitude is between ±π.
+ *
+ * @param latitude latitude of the point
+ * @param longitude longitude of the point
+ * @param altitude altitude of the point
+ */
+ public GroundPoint(final double latitude, final double longitude, final double altitude) {
+ double lat = MathUtils.normalizeAngle(latitude, FastMath.PI / 2);
+ double lon = MathUtils.normalizeAngle(longitude, 0);
+ if (lat > FastMath.PI / 2.0) {
+ // latitude is beyond the pole -> add 180 to longitude
+ lat = FastMath.PI - lat;
+ lon = MathUtils.normalizeAngle(longitude + FastMath.PI, 0);
+
+ }
+ this.latitude = lat;
+ this.longitude = lon;
+ this.altitude = altitude;
+ }
+
+ /** Get the latitude.
+ * @return latitude, an angular value in the range [-π/2, π/2]
+ */
+ public double getLatitude() {
+ return latitude;
+ }
+
+ /** Get the longitude.
+ * @return longitude, an angular value in the range [-π, π]
+ */
+ public double getLongitude() {
+ return longitude;
+ }
+
+ /** Get the altitude.
+ * @return altitude
+ */
+ public double getAltitude() {
+ return altitude;
+ }
+
+}
diff --git a/rugged-api/src/main/java/org/orekit/rugged/api/LineOfSightAlgorithm.java b/rugged-api/src/main/java/org/orekit/rugged/api/LineOfSightAlgorithm.java
new file mode 100644
index 0000000000000000000000000000000000000000..2fcf9af598e55829b888c6c4789c837b1fb1b496
--- /dev/null
+++ b/rugged-api/src/main/java/org/orekit/rugged/api/LineOfSightAlgorithm.java
@@ -0,0 +1,33 @@
+/* Copyright 2013-2014 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 line-of-sight intersection algorithm.
+ * @author Luc Maisonobe
+ */
+public enum LineOfSightAlgorithm {
+
+ /** Bernardt Duvenhage's algorithm.
+ * <p>
+ * The algorithm is described in the 2009 paper:
+ * <a href="http://researchspace.csir.co.za/dspace/bitstream/10204/3041/1/Duvenhage_2009.pdf">Using
+ * An Implicit Min/Max KD-Tree for Doing Efficient Terrain Line of Sight Calculations</a>.
+ * </p>
+ */
+ DUVENHAGE;
+
+}
diff --git a/rugged-api/src/main/java/org/orekit/rugged/api/Rugged.java b/rugged-api/src/main/java/org/orekit/rugged/api/Rugged.java
new file mode 100644
index 0000000000000000000000000000000000000000..9478170147659283f783816065a54af8422905a1
--- /dev/null
+++ b/rugged-api/src/main/java/org/orekit/rugged/api/Rugged.java
@@ -0,0 +1,52 @@
+/* Copyright 2013-2014 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;
+
+/** Main interface to Rugged library.
+ * @author Luc Maisonobe
+ */
+public interface Rugged {
+
+ /** Set up the tiles management.
+ * @param updater updater used to load Digital Elevation Model tiles
+ * @param maxCachedTiles maximum number of tiles stored in the cache
+ */
+ void setUpTilesManagement(TileUpdater updater, int maxCachedTiles);
+
+ /** Direct localization of a sensor line.
+ * @param sensorName name of the sensor
+ * @param lineNumber number of the line to localize on ground
+ * @param algorithm algorithm to use for line-of-sight/DEM intersection computation
+ * @return ground position of all pixels of the specified sensor line
+ * @exception RuggedException if line cannot be localized
+ */
+ GroundPoint[] directLocalization(String sensorName, int lineNumber,
+ LineOfSightAlgorithm algorithm)
+ throws RuggedException;
+
+ /** Inverse localization of a ground point.
+ * @param sensorName name of the sensor
+ * @param ground point to localize
+ * @param algorithm algorithm to use for line-of-sight/DEM intersection computation
+ * @return sensor pixel seeing ground point
+ * @exception RuggedException if line cannot be localized
+ */
+ SensorPixel inverseLocalization(String sensorName, GroundPoint groundPoint,
+ LineOfSightAlgorithm algorithm)
+ throws RuggedException;
+
+}