Search results for "terrain"

Hits ?▲	Authors	Title	Venue	Year	Link	Author keywords
31	Jonas Buchli, Mrinal Kalakrishnan, Michael N. Mistry, Peter Pastor, Stefan Schaal	Compliant quadruped locomotion over rough terrain.	IROS	2009	DBLP DOI BibTeX RDF
31	Nesrine Chehata, Frédéric Bretar	Terrain modeling from lidar data: Hierarchical K-means filtering and Markovian regularization.	ICIP	2008	DBLP DOI BibTeX RDF
31	Bernd-Helge Schäfer, Andreas Hach, Martin Proetzsch, Karsten Berns	3D obstacle detection and avoidance in vegetated off-road terrain.	ICRA	2008	DBLP DOI BibTeX RDF
31	J. Zico Kolter, Mike P. Rodgers, Andrew Y. Ng	A control architecture for quadruped locomotion over rough terrain.	ICRA	2008	DBLP DOI BibTeX RDF
31	Katie Byl, Russ Tedrake	Approximate optimal control of the compass gait on rough terrain.	ICRA	2008	DBLP DOI BibTeX RDF
31	Stephen Williams, Ayanna M. Howard	A single camera terrain slope estimation technique for natural arctic environments.	ICRA	2008	DBLP DOI BibTeX RDF
31	Blake Beckman, Jeff K. Pieper, David Mackay, Michael Trentini, David Erickson	Two dimensional dynamic stability for reconfigurable robots designed to traverse rough terrain.	IROS	2008	DBLP DOI BibTeX RDF
31	Karl Iagnemma, Shingo Shimoda, Zvi Shiller	Near-optimal navigation of high speed mobile robots on uneven terrain.	IROS	2008	DBLP DOI BibTeX RDF
31	Tim Braun, Henning Bitsch, Karsten Berns	Visual Terrain Traversability Estimation Using a Combined Slope/Elevation Model.	KI	2008	DBLP DOI BibTeX RDF
31	Jiping Niu	A Study on Extracting Terrain Characteristic Line from Large Valley DEM.	CSSE (6)	2008	DBLP DOI BibTeX RDF
31	Dong Tian, Xiaodong Wang, Xin Zheng	Dual-cache Structure Based Large Scale Texture Mapping for Real-time Terrain Rendering.	RAM	2008	DBLP DOI BibTeX RDF
31	Huaiqing He, Chong Wang, Haohan Liu	An Improved Approach on Visualization of Large-Scale Terrain Surface.	CGIV	2007	DBLP DOI BibTeX RDF	ROAM algorithm, An efficient data structure, data conjunction, coding, out-of-core
31	John R. Rebula, Peter D. Neuhaus, Brian V. Bonnlander, Matthew J. Johnson 0001, Jerry E. Pratt	A Controller for the LittleDog Quadruped Walking on Rough Terrain.	ICRA	2007	DBLP DOI BibTeX RDF
31	Xiaoming Zheng, Sven Koenig	Robot coverage of terrain with non-uniform traversability.	IROS	2007	DBLP DOI BibTeX RDF
31	Refik Samet, Emrah Ozsavas	Optimization of Quadtree Triangulation for Terrain Models.	ACIVS	2007	DBLP DOI BibTeX RDF
31	Kenji Hashimoto, Yusuke Sugahara, Masamiki Kawase, Akihiro Ohta, Chiaki Tanaka, Akihiro Hayashi, Nobutsuna Endo, Terumasa Sawato, Hun-ok Lim, Atsuo Takanishi	Landing Pattern Modification Method with Predictive Attitude and Compliance Control to Deal with Uneven Terrain.	IROS	2006	DBLP DOI BibTeX RDF
31	Hanli Zhao, Xiaogang Jin 0001, Jianbing Shen	Simple and Fast Terrain Rendering Using Graphics Hardware.	ICAT	2006	DBLP DOI BibTeX RDF	GPU, level of detail, Real-time rendering, occlusion culling
31	Pin Lv, Jinfang Zhang, Min Lu	An Optimal Method for Multiple Observers Sitting on Terrain Based on Improved Simulated Annealing Techniques.	IEA/AIE	2006	DBLP DOI BibTeX RDF
31	Maarten Uijt de Haag, Ananth Vadlamani, Jacob L. Campbell, Jeff Dickman	Application of Laser Range Scanner Based Terrain Referenced Navigation Systems for Aircraft Guidance.	DELTA	2006	DBLP DOI BibTeX RDF
31	Xuexian Pi, Junqiang Song, Liang Zeng 0001, Sikun Li	Procedural Terrain Detail Based on Patch-LOD Algorithm.	Edutainment	2006	DBLP DOI BibTeX RDF
31	Dong-Soo Kang, Yun-Jin Kim, Byeong-Seok Shin	Efficient Large-Scale Terrain Rendering Method for Real-World Game Simulation.	Edutainment	2006	DBLP DOI BibTeX RDF
31	Cang Ye, Johann Borenstein	A Method for Mobile Robot Navigation on Rough Terrain.	ICRA	2004	DBLP DOI BibTeX RDF
31	Stefan B. Williams, Ian Mahon	Terrain Aided Localisation and Mapping for Marine Environments.	ISER	2004	DBLP DOI BibTeX RDF
31	Ronen Lerner, Ehud Rivlin, Héctor Rotstein	Error Analysis for a Navigation Algorithm Based on Optical-Flow and a Digital Terrain Map.	CVPR (1)	2004	DBLP DOI BibTeX RDF
31	Cristina Rebollo, Inmaculada Remolar, Miguel Chover, J. Francisco Ramos	A Comparison of Multiresolution Modelling in Real-Time Terrain Visualisation.	ICCSA (2)	2004	DBLP DOI BibTeX RDF
31	Russel A. Apu, Marina L. Gavrilova	GTVIS: Fast and Efficient Rendering System for Real-Time Terrain Visualization.	ICCSA (2)	2004	DBLP DOI BibTeX RDF
31	Hyung Sik Yoon, Moon-Ju Jung, JungHyun Han	Alternation of Levels-of-Detail Construction and Occlusion Culling for Terrain Rendering.	CIS	2004	DBLP DOI BibTeX RDF
31	Michael Hesse, Marina L. Gavrilova	An Efficient Algorithm for Real-Time 3D Terrain Walkthrough.	ICCSA (3)	2003	DBLP DOI BibTeX RDF
31	Danny Z. Chen, Xiaobo Hu 0001, Shuang Luan, Xiaodong Wu 0001, Cedric X. Yu	Optimal Terrain Construction Problems and Applications in Intensity-Modulated Radiation Therapy.	ESA	2002	DBLP DOI BibTeX RDF
31	Karl Iagnemma, Dariusz Golda, Matthew Spenko, Steven Dubowsky	Experimental Study of High-speed Rough-terrain Mobile Robot Models for Reactive Behaviors.	ISER	2002	DBLP DOI BibTeX RDF
31	Mariano Pérez, Marcos Fernández 0001, Miguel Lozano	Adding Synthetic Detail to Natural Terrain Using a Wavelet Approach.	International Conference on Computational Science (2)	2002	DBLP DOI BibTeX RDF
31	Stephan J. Eidenbenz	How Many People Can Hide in a Terrain?	ISAAC	1999	DBLP DOI BibTeX RDF
31	Ming Wan, Huamin Qu, Arie E. Kaufman	Virtual Flythrough over a Voxel-Based Terrain.	VR	1999	DBLP DOI BibTeX RDF
31	Reid G. Simmons, Eric Krotkov, William Whittaker, Brian Albrecht, John Bares, Christopher Fedor, Regis Hoffman, Henning Pangels, David Wettergreen	Progress towards robotic exploration of extreme terrain.	Appl. Intell.	1992	DBLP DOI BibTeX RDF	robot system design, Autonomous robots, planetary exploration
31	Alex D. Kelley, Michael C. Malin, Gregory M. Nielson	Terrain simulation using a model of stream erosion.	SIGGRAPH	1988	DBLP DOI BibTeX RDF	database amplification, drainage network simulation, erosion models, surfaces under tension, structural models
30	Karl Iagnemma, Chris C. Ward	Classification-based wheel slip detection and detector fusion for mobile robots on outdoor terrain.	Auton. Robots	2009	DBLP DOI BibTeX RDF	Wheel slip, Outdoor terrain, Mobile robots
30	Quan Qiu, TangWen Yang, Jianda Han	A new real-time algorithm for off-road terrain estimation using laser data.	Sci. China Ser. F Inf. Sci.	2009	DBLP DOI BibTeX RDF	off-road, terrain estimation, laser data, real-time
30	Yacine Amara, Xavier Marsault	A GPU Tile-Load-Map architecture for terrain rendering: theory and applications.	Vis. Comput.	2009	DBLP DOI BibTeX RDF	GPU architecture, Data amplification, Seed model, Level of detail, Terrain rendering
30	Stephen D. Prior, Siu-Tsen Shen, Anthony S. White, Siddharth Odedra, Mehmet Karamanoglu, Mehmet Ali Erbil, Tom Foran	Development of a Novel Platform for Greater Situational Awareness in the Urban Military Terrain.	HCI (17)	2009	DBLP DOI BibTeX RDF	military operations, urban terrain, situational awareness, unmanned aerial vehicles
30	Jonathan Ferraris, Christos Gatzidis	A rule-based approach to 3D terrain generation via texture splatting.	Advances in Computer Entertainment Technology	2009	DBLP DOI BibTeX RDF	3D terrain modeling, computer games technology
30	Yotam Livny, Neta Sokolovsky, Tal Grinshpoun, Jihad El-Sana	A GPU persistent grid mapping for terrain rendering.	Vis. Comput.	2008	DBLP DOI BibTeX RDF	Multiresolution hierarchies, Graphics processors, Terrain rendering
30	Renato Pajarola, Enrico Gobbetti	Survey of semi-regular multiresolution models for interactive terrain rendering.	Vis. Comput.	2007	DBLP DOI BibTeX RDF	Multiresolution triangulation, Terrain rendering, Semi-regular meshes
30	Dong-Min Woo, Dong-Chul Park 0002, Young-Soo Song, Quoc-Dat Nguyen, Quang-Dung Nguyen Tran	Terrain Classification Based on 3D Co-occurrence Features.	ICIC (1)	2007	DBLP DOI BibTeX RDF	3D feature, clustering, texture, terrain, co-occurrence
30	Pankaj K. Agarwal, Sergey Bereg, Ovidiu Daescu, Haim Kaplan, Simeon C. Ntafos, Binhai Zhu	Guarding a terrain by two watchtowers.	SCG	2005	DBLP DOI BibTeX RDF	terrain guarding, visibility algorithms, computational geometry, art gallery, parametric search
30	Emanuele Danovaro, Leila De Floriani, Enrico Puppo, Hanan Samet	Multi-resolution out-of-core modeling of terrain and teological data.	GIS	2005	DBLP DOI BibTeX RDF	multi-resolution, terrain models, out-of-core
30	Russel A. Apu, Marina L. Gavrilova	Adaptive mesh generation for real-time terrain modeling.	SCG	2004	DBLP DOI BibTeX RDF	adaptive loop subdivision methods, cascading coupling march method, real-time terrain visualization, triangle mesh update, computational geometry
30	Wei Hua, Huaisheng Zhang, Yanqing Lu, Hujun Bao, Qunsheng Peng 0001	Huge texture mapping for real-time visualization of large-scale terrain.	VRST	2004	DBLP DOI BibTeX RDF	mipmap, texture mapping, real-time rendering, terrain, out-of-core, texture compression
30	Giuliano Antoniol, Michele Ceccarelli, Antonio Maratea, F. Russo	Classification of Digital Terrain Models Through Fuzzy Clustering: An Application.	WILF	2003	DBLP DOI BibTeX RDF	Fuzzy Clustering, Digital Terrain Model, Validity Index
30	Reinhard Klein, Daniel Cohen-Or, Tobias Hüttner	Incremental view-dependent multiresolution triangulation of terrain.	PG	1997	DBLP DOI BibTeX RDF	view-dependent multiresolution triangulation, terrain triangulation, real-time flythrough, multiresolution Delaunay triangulation, view-dependent error tolerance, global geometric approximation error, incremental triangulation, rendering, mesh generation, on-the-fly
30	Xiaoguang Wang 0013, Frank Stolle, Howard J. Schultz, Edward M. Riseman, Allen R. Hanson	Using Three-Dimensional Features to Improve Terrain Classification.	CVPR	1997	DBLP DOI BibTeX RDF	3-D feature, image segmentation, texture analysis, terrain classification
29	Mitch Bryson, Matthew Johnson-Roberson, Salah Sukkarieh	Airborne smoothing and mapping using vision and inertial sensors.	ICRA	2009	DBLP DOI BibTeX RDF
29	Kyeong Bin Lim, Sukhoon Park, Suengwoo Kim, Jae Muk Jeong, Yong-San Yoon	Behavior planning of an unmanned ground vehicle with actively articulated suspension to negotiate geometric obstacles.	IROS	2009	DBLP DOI BibTeX RDF
29	Michael Shneier, Tommy Chang, Tsai Hong, William P. Shackleford, Roger Bostelman, James S. Albus	Learning traversability models for autonomous mobile vehicles.	Auton. Robots	2008	DBLP DOI BibTeX RDF	Classification, Learning, Mobile robotics, Texture, Range, Traversability, Color models
29	Yueh-Yi Lai, Wen-Kai Tai	Transition Texture Synthesis.	J. Comput. Sci. Technol.	2008	DBLP DOI BibTeX RDF	texture transition, texture mapping, texture synthesis
29	Shiben Bhattacharjee, P. J. Narayanan	Real-Time Painterly Rendering of Terrains.	ICVGIP	2008	DBLP DOI BibTeX RDF
29	Cang Ye	Navigating a Mobile Robot by a Traversability Field Histogram.	IEEE Trans. Syst. Man Cybern. Part B	2007	DBLP DOI BibTeX RDF
29	Hyun-chong Cho, K. Clint Slatton	Morphological Processing of Severely Occluded Digital Elevation Images to Extract and Connect Stream Channels.	ICIP (2)	2007	DBLP DOI BibTeX RDF
29	Gijs Dubbelman, Wannes van der Mark, Johan H. C. van den Heuvel, Frans C. A. Groen	Obstacle detection during day and night conditions using stereo vision.	IROS	2007	DBLP DOI BibTeX RDF
29	Mark Ollis, Wesley H. Huang, Michael Happold	A Bayesian approach to imitation learning for robot navigation.	IROS	2007	DBLP DOI BibTeX RDF
29	Chen Wang, Tao Ruan Wan, Ian J. Palmer	A Real-time Dynamic Simulation Scheme for Large-Scale Flood Hazard Using 3D Real World Data.	IV	2007	DBLP DOI BibTeX RDF
29	Gye-Beom Jeon, Won Cheol Kim, Amarjagal Enkhsaruul, Eun-Ju Kim, Jongwan Lee, Sun-Jeong Kim, Chang Geun Song	An Interactive Snowboard Game in Virtual Environment.	Edutainment	2007	DBLP DOI BibTeX RDF	Bodily Sensible Game, Snowboard Game, Virtual Reality, LOD, ROAM, Physics Engine
29	Hai Li, Zhenfang Li, Guisheng Liao, Zheng Bao 0001	An estimation method for InSAR interferometric phase combined with image auto-coregistration.	Sci. China Ser. F Inf. Sci.	2006	DBLP DOI BibTeX RDF	synthetic aperture radar interferometry (InSAR), subspace projection, single-baseline, interferometric phase, eigen-decomposition, image coregistration, local plane
29	Esther Moet, Marc J. van Kreveld, A. Frank van der Stappen	On realistic terrains.	SCG	2006	DBLP DOI BibTeX RDF	polyhedral terrains, realistic input models, shortest paths, voronoi diagrams, visibility maps
29	Vivek Verma, Rakesh Kumar 0001, Stephen C. Hsu	3D Building Detection and Modeling from Aerial LIDAR Data.	CVPR (2)	2006	DBLP DOI BibTeX RDF
29	A. K. Kanduri, Geb W. Thomas, Nathalie Cabrol, Edmond Grin, Robert C. Anderson	The (in)accuracy of novice rover operators' perception of obstacle height from monoscopic images.	IEEE Trans. Syst. Man Cybern. Part A	2005	DBLP DOI BibTeX RDF
29	Jürgen Döllner, Klaus H. Hinrichs	Dynamic 3D Maps and Their Texture-Based Design.	Computer Graphics International	2000	DBLP DOI BibTeX RDF	Multiresolution Modeling, 3D Maps, Multitexturing, Map Design
29	Howard J. Schultz, Dong-Min Woo, Frank Stolle, Edward M. Riseman	Error Detection and DEM Fusion using Self-Consistency.	ICCV	1999	DBLP DOI BibTeX RDF
29	Boris Aronov, Marc J. van Kreveld, René van Oostrum, Kasturi R. Varadarajan	Facility Location on Terrains.	ISAAC	1998	DBLP DOI BibTeX RDF
29	Dan Halperin, Micha Sharir	New Bounds for Lower Envelopes in Three Dimensions, with Applications to Visibility in Terrains.	SCG	1993	DBLP DOI BibTeX RDF
28	Wenzhe Fa, Feng Xu 0001, Ya-Qiu Jin	SAR imaging simulation for an inhomogeneous undulated lunar surface based on triangulated irregular network.	Sci. China Ser. F Inf. Sci.	2009	DBLP DOI BibTeX RDF	cratered terrain, triangulated irregular network, SAR imaging, back projection
28	Michael McCann, Richard Puk, Alan Hudson, Rex Melton, Donald P. Brutzman	Proposed enhancements to the X3D geospatial component.	Web3D	2009	DBLP DOI BibTeX RDF	3-D geography, X3D-Earth, floating origin, data visualization, X3D, geospatial, terrain rendering
28	Giliam J. P. de Carpentier, Rafael Bidarra	Interactive GPU-based procedural heightfield brushes.	FDG	2009	DBLP DOI BibTeX RDF	heightfields, procedural synthesis, shader programming, graphics hardware, GPGPU, terrain modeling
28	Rahul Sawhney, K. Madhava Krishna, Kannan Srinathan	On fast exploration in 2D and 3D terrains with multiple robots.	AAMAS (1)	2009	DBLP BibTeX RDF	metric, 3D, exploration, UAV, terrain, multi robots
28	Mohammed Mostefa Mesmoudi, Leila De Floriani, Paola Magillo	Morphological analysis of terrains based on discrete curvature and distortion.	GIS	2008	DBLP DOI BibTeX RDF	morphology, curvature, terrain modeling
28	Morgan McGuire, Kyle Whitson	Indirection mapping for quasi-conformal relief texturing.	SI3D	2008	DBLP DOI BibTeX RDF	heightfield, parallax occlusion, relief, terrain, bump
28	Yehuda Ben-Shimol, Boaz Ben-Moshe, Yoav Ben-Yehezkel, Amit Dvir, Michael Segal 0001	Automated antenna positioning algorithms for wireless fixed-access networks.	J. Heuristics	2007	DBLP DOI BibTeX RDF	Fixed-access wireless networks, Automated antenna positioning, Rural areas, Terrain preprocessing
28	Andrew Danner, Thomas Mølhave, Ke Yi 0001, Pankaj K. Agarwal, Lars Arge, Helena Mitásová	TerraStream: from elevation data to watershed hierarchies.	GIS	2007	DBLP DOI BibTeX RDF	terrain modeling
28	Joachim Pouderoux, Jean-Eudes Marvie	Adaptive streaming and rendering of large terrains using strip masks.	GRAPHITE	2005	DBLP DOI BibTeX RDF	adaptive rendering, streaming, level of detail, handhelds, terrain rendering
28	Mohammad A. Rajabi, J. A. Rod Blais	Optimization of DTM Interpolation Using SFS with Single Satellite Imagery.	J. Supercomput.	2004	DBLP DOI BibTeX RDF	densification, irradiance model, shape index, classification, parallel processing, interpolation, remote sensing, shape from shading, digital terrain model, albedo
28	Joseph S. B. Mitchell, Micha Sharir	New results on shortest paths in three dimensions.	SCG	2004	DBLP DOI BibTeX RDF	shortest path, NP-hardness, motion planning, terrain
28	A. R. Dixon, G. H. Kirby, Derek P. M. Wills	Artificial planets with fractal feature specification.	Vis. Comput.	1999	DBLP DOI BibTeX RDF	Artificial terrain, Planetary modelling, Quaternary triangular mesh, Fractals, Flight simulation
28	Leila De Floriani, Enrico Puppo	Hierarchical Triangulation for Multiresolution Surface Description.	ACM Trans. Graph.	1995	DBLP DOI BibTeX RDF	hierarchical subdivision, multiresolution surface model, triangulation, terrain model
26	Brian Wilcox	Robotic vehicles for planetary exploration.	Appl. Intell.	1992	DBLP DOI BibTeX RDF	terrain sensing, Mobile robots, path planning, terrain modeling
24	Nicholas Cherouvim, Evangelos Papadopoulos	Control of hopping speed and height over unknown rough terrain using a single actuator.	ICRA	2009	DBLP DOI BibTeX RDF
24	Douglas Brooks, Ayanna M. Howard	Mobility reconfiguration for terrain exploration using passive perception.	ICRA	2009	DBLP DOI BibTeX RDF
24	Tomohito Takubo, Yoshinori Imada, Kenichi Ohara, Yasushi Mae, Tatsuo Arai	Rough terrain walking for bipedal robot by using ZMP criteria map.	ICRA	2009	DBLP DOI BibTeX RDF
24	Bokman Lim, Beobkyoon Kim, Frank Chongwoo Park, D. W. Hong	Movement primitives for three-legged locomotion over uneven terrain.	ICRA	2009	DBLP DOI BibTeX RDF
24	Katie Byl, Russ Tedrake	Dynamically diverse legged locomotion for rough terrain.	ICRA	2009	DBLP DOI BibTeX RDF
24	Tae-Seok Lee, Jeong-Sik Choi, Jeong Hee Lee, Beom Hee Lee 0001	3-D terrain covering and map building algorithm for an AUV.	IROS	2009	DBLP DOI BibTeX RDF
24	Yang Song 0007, Jeffrey A. Rudin, Ali Akoglu	Parallel implementation of Irregular Terrain Model on IBM Cell Broadband Engine.	IPDPS	2009	DBLP DOI BibTeX RDF
24	Hongbo Mei, Guangdao Hu, Linli Zhou, Huiqin Zeng	Evaluation of Cobalt-Rich Crust Resources Based on Fractal Characteristics of Seamount Terrain.	ISICA	2009	DBLP DOI BibTeX RDF	Cobalt-rich crust, Fractal box dimension, Ordinary Kriging, Resources evaluation
24	Boaz Ben-Moshe, Paz Carmi, Matthew J. Katz	Approximating the Visible Region of a Point on a Terrain.	GeoInformatica	2008	DBLP DOI BibTeX RDF	triangulated irregular networks, algorithms, visibility
24	Max Bajracharya, Benyang Tang, Andrew Howard, Michael J. Turmon, Larry H. Matthies	Learning long-range terrain classification for autonomous navigation.	ICRA	2008	DBLP DOI BibTeX RDF
24	Edmond M. DuPont, Carl A. Moore, Rodney G. Roberts	Terrain classification for mobile robots traveling at various speeds: An eigenspace manifold approach.	ICRA	2008	DBLP DOI BibTeX RDF
24	Keiji Nagatani, Ayato Yamasaki, Kazuya Yoshida, Tomoaki Yoshida, Eiji Koyanagi	Semi-autonomous traversal on uneven terrain for a tracked vehicle using autonomous control of active flippers.	IROS	2008	DBLP DOI BibTeX RDF
24	Keiji Nagatani, Ayato Yamasaki, Kazuya Yoshida, Tomoaki Yoshida, Eiji Koyanagi	Improvement of the operability of a tracked vehicle on uneven terrain using autonomous control of active flippers.	IROS	2008	DBLP DOI BibTeX RDF
24	Pin Lv, Lin Yuan, Jinfang Zhang	Cloud Theory Based Simulated Annealing Algorithm for Multiple Observers Sitting on Terrain Problem.	ICIC (2)	2008	DBLP DOI BibTeX RDF
24	Huijie Zhang, Dantong Ouyang, Heping Lin, Jingbo Zhang	A Terrain Model Simplification Method Based on Adaptive Threshold Selection.	CSSE (2)	2008	DBLP DOI BibTeX RDF
24	Pankaj K. Agarwal	Modeling and Analyzing Massive Terrain Data Sets.	ISAAC	2007	DBLP DOI BibTeX RDF
24	Hirohisa Hirukawa, Shizuko Hattori, Shuuji Kajita, Kensuke Harada, Kenji Kaneko, Fumio Kanehiro, Mitsuharu Morisawa, Shinichiro Nakaoka	A Pattern Generator of Humanoid Robots Walking on a Rough Terrain.	ICRA	2007	DBLP DOI BibTeX RDF