Dr. John F. Hahn Profile

Dr. John F. Hahn

at Optech Inc

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Author

Publications (3)

Proceedings Article | 21 August 2003 Paper

Applications of time-of-flight lidar in crater geology

Alain Berinstain, Gordon Osinski, John Spray, Pascal Lee, John Hahn, Arkady Ulitsky

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.501696

KEYWORDS: LIDAR, Geology, Planets, Photography, Climatology, Safety, Carbonates, Reflectivity, Data acquisition, 3D image processing

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Devon Island, in the Canadian High Arctic (75°22’N, 89°41’W), is the largest uninhabited island on the planet. The climate is that of a polar desert; it is cold, dry, dusty, rocky, and almost void of any vegetation. The eastern part of the island is still covered by an ice cap, a remnant of the Inuitian Ice Sheet system that covered the bulk of the area during the last Glacial Maximum 8 000-10 000 years ago.. The island is rich in well-preserved geology, relatively free of erosion. The feature of highest scientific interest on Devon Island is the ~23-million-year-old (Miocene), ~24 km diameter Haughton impact structure.. There are few other craters on this planet as well preserved and exposed as Haughton, mainly due to the unique climate that slows down erosion common on the rest of the planet.The NASA Haughton-Mars project is an international planetary analog research project headquartered at NASA Ames Research Centre and managed by the SETI Institute. The lidar work described in this work is a collaborative activity between the SETI Institute, the University of Guelph, the University of New Brunswick, Optech Inc., and the Canadian Space Agency. Field activities were conducted under the auspices of the NASA HMP and of the CSA. Specific sites of geological interest within Haughton impact structure were imaged using an Optech Ilris 3-d ground-surveying unit. This very high-resolution, 3-dimensional data allows for the field geologist to "re-visit" a field site well after the field season has finished. In this work, we will present the results of 3-dimensional scans of an ejecta block and of impact-generated rock formations that contribute to furthering our understanding of impact cratering, a fundamental and universal process of planetary formation and evolution, and to studies of the erosional history of Haughton Crater and surrounding terrain on Devon Island. We will demonstrate how using this tool in the field can increase safety and allow for precise measurements to be made after the field season is completed.

Proceedings Article | 5 August 2003 Paper

Development of a compact high-resolution 3D laser range imaging system

Jeffrey Tripp, Arkady Ulitsky, Sergey Pashin, Nikolai Mak, John Hahn

Proceedings Volume 5088, (2003) https://doi.org/10.1117/12.498560

KEYWORDS: LIDAR, Laser systems engineering, Range imaging, Imaging systems, Reflectivity, Space operations, Inspection, Laser scanners, 3D scanning, Clouds

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Proceedings Article | 7 December 1998 Paper

ORACLE (Ozone Research with Advanced Cooperative Lidar Experiment): joint NASA-CSA development of a space-based ozone dial

Donald Ball, Alexander Dudelzak, Fernand Rheault, Edward Browell, Syed Ismail, John Stadler, Raymond Hoff, C. McElroy, Allan Carswell, John Hahn, Arkady Ulitsky

Proceedings Volume 3494, (1998) https://doi.org/10.1117/12.332422

KEYWORDS: Ozone, Aerosols, Telescopes, LIDAR, Space telescopes, Clouds, Atmospheric chemistry, Atmospheric particles, Device simulation, Ultraviolet radiation

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