Semme Dijkstra


Ph.D. University of New Brunswick

Semme Dijkstra holds a Ph.D. in Ocean Mapping from the University of New Brunswick. He is a certified (Cat A) hydrographer from the Netherlands who has several years of hydrographic experience with both the Dutch Navy and industry. From 1996 to 1999, he worked at the Alfred Wegner Institute in Germany where he was in charge of their multibeam-sonar processing. His thesis work involved artifact removal from multibeam-sonar data and development of an echo-sounder processing and sediment classification system. His research focuses on applications of single-beam sonars for seafloor characterization, small object detection and fisheries habitat mapping.

In 2008, Dr. Dijkstra was appointed a full-time instructor and he has taken a much larger role in teaching courses and in evaluating the overall CCOM curriculum.



Beduhn, Tami, and Dijkstra, Semme J., (2011), On the Horizon: Better Bottom Detection for Areas of Sub-Aquatic Vegetation, U.S. Hydrographic Conference (US HYDRO), Tampa, FL, USA, Apr 25 - Apr 28. Conference Proceeding Beduhn_Dijkstra_2011_on_the_horizon_better_bottom_detection.pdf (1.7 MB)
Dijkstra, Semme J., and Armstrong, Andrew A, (2011), IHO/FIG/ICA Category A Course Program Submission, Center for Coastal and Ocean Mapping/ Joint Hydrographic Center, Durham, NH, USA , p.p. 1 - 354. . Report


Grizzle, Raymond E., Ward, Larry G., Adams, J R., Dijkstra, Semme J., and Smith, Brian, (2005), Mapping and Characterizing Oyster Reefs using Acoustic Techniques, Underwater Videography and Quadrat Sampling, Benthic Habitats and the Effects of Fishing, American Fisheries Society, Bethesda, MD, USA. Book Section


Elston, Gareth R., and Dijkstra, Semme J., (2004), Waveform characterization, clustering and segmentation of SHOALS, Joint Airborne LIDAR Bathymetry Technical Center of Expertise Coastal Mapping and Charting Workshop (JALBTCX), St. Andrews, New Brunswick, Canada. Conference Proceeding
Dijkstra, Semme J., and Elston, Gareth R., (2004), Bottom Segmentation and Classification Using Expectation-maximization Clustering Methods on SHOALS Data, American Society for Photogrammetry and Remote Sensing (ASPRS), Denver, CO, USA, May 23 - May 28. Conference Proceeding
Dijkstra, Semme J., (2004), Robust Characterization of SHOALS Lidar Signals for Bottom Segmentation and Classification: A Combined Parameter-estimation and Curve Fitting Approach, American Society for Photogrammetry and Remote Sensing (ASPRS), Denver, CO, USA, May 23 - May 28. Conference Proceeding


Monahan, Dave, Chance, J, Dare, P, Dijkstra, Semme J., Dodd, D, Howden, D, Richer, J, Santos, M, Wells, David E., and Wiesenburg, D, (2003), Hydrographic Learning 24/7, U.S. Hydrographic Conference (US HYDRO), Biloxi, MS, USA, Mar 24 - Mar 27. Conference Proceeding


Dijkstra, Semme J., and Intelmann, S, (2002), Mapping Benthic Habitat at Various scales in the Olympic National Marine Sanctuary, WA, National Shellfisheries Association (NSA), New Orleans, LA, USA. Conference Proceeding
Dijkstra, Semme J., and Grizzle, Raymond E., (2002), Automated Interpretation of Sidescan and Single-beam Sonar for Characterization and Mapping the Extent of Subtidal Oyster Reefs, National Shellfisheries Association (NSA), Mystic, CT, USA, Apr 14 - Apr 18. Conference Proceeding
Wells, David E., Richer, J, Santos, M, Dare, P, Allen, I, Wiesenburg, D, Dodd, D, Howden, D, Davis, J, Armstrong, Andrew A, et al., (2002), Open Access Learning at Sea, Canadian Hydrographic Conference (CHC), Toronto, Ontario, Canada, May 28 - May 31. Conference Proceeding


Adams, J R., Dijkstra, Semme J., Grizzle, Raymond E., Nelson, J, and Ward, Larry G., (2001), Comparison of Acoustic Techniques, Videography, and Quadrant Sampling for Characterizing Subtidal Oyster Reefs, National Shellfisheries Association (NSA), Mystic, CT, USA, Apr 14 - Apr 18. Conference Proceeding
Dijkstra, Semme J., (2001), Seafloor Characterization Using Vertical Incidence Echosounders: A Study in Portsmouth Harbor and the Great Bay Estuary, New Hampshire, International Conference on High-Resolution Survey in Shallow Water (HRSSW), Portsmouth, NH, USA, Sep 24 - Sep 24. Conference Proceeding


Dijkstra, Semme J., and Mayer, Larry A., (2000), TracEd: A Remote Acoustic Seafloor Characterization System for Use with Vertical Incidence Echosounders, IEEE Oceans, p.1211-1217. Journal Article


Center for Coastal & Ocean
Jere A. Chase Ocean Engineering Laboratory
24 Colovos Road
Durham, NH 03824

Research Areas: 
Hydrographic Surveying and Charting
Ocean and Seafloor Mapping
Sonar Imaging