Digital Commons Network^™

Seafloor Video Mapping: Modeling, Algorithms, Apparatus, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.

Center for Coastal and Ocean Mapping

This paper discusses a technique used for construction of high-resolution image mosaic from a videosequence and the synchronously logged camera attitude information. It allows one to infer geometric characteristics of the imaged terrain and hence improve the mosaic quality and reduce the computational burden. The technique is demonstrated using numerical modeling and is applied to videodata collected on Rainsford Island, Mass. Calculation of the transformation relating consecutive image frames is an essential operation affecting reliability of the whole mosaicing process. Improvements to the algorithm are suggested, which significantly decrease the possibility of convergence to an inappropriate solution.

Unh Successfully Completes Historic Funding Effort, Sarah Aldag

Media Relations

No abstract provided.

The Navigation Surface: A New Database Approach To Creating Multiple Products From High-Density Surveys, Shep M. Smith Lt, Lee Alexander, Andy Armstrong

Center for Coastal and Ocean Mapping

High-resolution bathymetric surveys are revolutionising hydrographic surveying. ln addition to safety-of-navigation , there are a host of other uses for high-resolution bathymetry, including habitat mapping, hydrologic modelling, marine archaeology, and marine environmental protection. However, at present, there is no suitable method that can be used to produce multiple products that meet the needs of both navigation customers and other users . A research project conducted at the University of New Hampshire developed a model of the seafloor that is optimised for safety-of-navigation . This new technique bypasses the rather subjective, 'selected soundings' approach. Instead, a statistical model is created directly …

Underwater Video Survey: Planning And Data Processing, Yuri Rzhanov, Lloyd C. Huff, Randy G. Cutter Jr.

Center for Coastal and Ocean Mapping

The importance of underwater video surveys as an exploration tool has been steadily increasing over recent years [1]. Better photographic equipment, more effective sources of illumination, and improved processing techniques - all make video surveying a reliable tool for seafloor habitat mapping, sediment boundary delineation and groundtruthing, mapping and documentation of forensic and archaeological sites. There is a change in attitude towards video surveying that affects the way the data is collected, and hence its quality. Earlier video data processing algorithms had to cope with whatever was recorded (often simultaneously with acquisition of other data, considered to be more important). …

Unh Center Helping New Hampshire Meet Needs In Management Of Technology, Mary Peterson

Media Relations

No abstract provided.

Unh Scientists Travel To Amazonia To Assess Fires, Sharon Keeler

Media Relations

No abstract provided.

2002 (January-June) Performance And Progress Report: Unh/Noaa Joint Hydrographic Center, Larry A. Mayer, Noaa-Unh Joint Hydrographic Center (Jhc/Ccom)

Progress Reports

Report Period: 01/01/2002 – 07/01/2002

Campaign Gift Honors Outgoing President, Sarah Aldag

Media Relations

No abstract provided.

The High-Frequency Backscattering Angular Response Of Gassy Sediments: Model/Data Comparison From The Eel River Margin, California, Luciano E. Fonseca, Larry A. Mayer, Dan Orange, Neal Driscoll

Center for Coastal and Ocean Mapping

A model for the high-frequency backscatter angular response of gassy sediments is proposed. For the interface backscatter contribution we adopted the model developed by Jackson et al. @J. Acoust. Soc. Am. 79, 1410–1422 ~1986!#, but added modifications to accommodate gas bubbles. The model parameters that are affected by gas content are the density ratio, the sound speed ratio, and the loss parameter. For the volume backscatter contribution we developed a model based on the presence and distribution of gas in the sediment. We treat the bubbles as individual discrete scatterers that sum to the total bubble contribution. This total bubble …

The Compilation And Analysis Of Data Relevant To A U.S. Claim Under United Nations Law Of The Sea Article 76: A Preliminary Report, Larry A. Mayer, Martin Jakobsson, Andy Armstrong

Center for Coastal and Ocean Mapping

No abstract provided.

Studies Of Peroxyacetyl Nitrate (Pan) And Its Interaction With The Snowpack At Summit, Greenland, Kevin M. Ford, Bradley M. Campbell, P B. Shepson, Steven B. Bertman, R E. Honrath, Matthew C. Peterson, Jack E. Dibb

Earth Sciences

Peroxyacetyl nitrate (PAN) was measured in ambient and snowpack interstitial air at Summit, Greenland, in June and July of 1998 and 1999 and at a rural/forest site in the Keewenaw Peninsula of Michigan in January of 1999. At Summit, we found that PAN typically represented between 30 and 60% of NO_y. In the summer of 1999, a significant diel variation in both PAN/NO_y and NO_x/NO_y was observed, but this was much less pronounced in 1998. Experiments during SNOW99 near Houghton, Michigan, indicated that PAN undergoes weak uptake onto snow grain surfaces. At Summit, we …

Hypsometry And Volume Of The Arctic Ocean And Its Constituent Seas, Martin Jakobsson

Center for Coastal and Ocean Mapping

This paper presents an analysis of the Arctic Ocean and its constituent seas for seafloor area distribution versus depth and ocean volume. The bathymetry from the International Bathymetric Chart of the Arctic Ocean (IBCAO) is used together with limits defining this ocean and its constituent seas from the International Hydrographic Organization (IHO) as well as redefined limits constructed to confine the seas to the shallow shelves. IBCAO is a bathymetric grid model with a resolution of 2.5 x 2.5 km, which significantly improved the portrayal of the Arctic Ocean seafloor through incorporation of newly released bathymetric data including echo soundings …

The New Hampshire, Vol. 91 [92], No. 52 (May 14, 2002), The New Hampshire

The New Hampshire Print Edition

An independent student produced newspaper from the University of New Hampshire. This volume was printed as 91, but it is the 92nd volume in the series. This was corrected in pencil.

The New Hampshire, Vol. 91 [92], No. 51 (May 10, 2002), The New Hampshire

The New Hampshire Print Edition

An independent student produced newspaper from the University of New Hampshire. This volume was printed as 91, but it is the 92nd volume in the series. This was corrected in pencil.

Geometric And Radiometric Correction Of Multibeam Backscatter Derived From Reson 8101 Systems, Jonathan Beaudoin, J.E. Hughes Clarke, Edward J. Van Den Ameele, James V. Gardner

Center for Coastal and Ocean Mapping

A common by-product of multibeam surveys is a measure of the backscattered acoustic intensity from the seafloor. These data are of immense interest to geologists and geoscientists since maps of the acoustic backscatter strength can be used to infer physical properties of the sea bottom, such as impedance, roughness and volume inhomogeneity. Before such maps can be created from multibeam acoustic backscatter data, however, two tasks must be performed.

1. The data must be geographically registered using the bathymetric profile collected by the multibeam (which accounts for full orientation and refraction), as opposed to using the traditional flat-seafloor assumption. This …

Shouldn’T Snowpacks Be Sources Of Monocarboxylic Acids?, Jack E. Dibb, Matthew Arsenault

Earth Sciences

We report the first measurements of the mixing ratios of acetic (CH₃COOH) and formic (HCOOH) acids in the air filling the pore spaces of the snowpacks (firn air) at Summit, Greenland and South Pole. Both monocarboxylic acids were present at levels well above 1 ppbv throughout the upper 35 cm of the snowpack at Summit. Maximum mixing ratios in Summit firn air reached nearly 8 ppbv CH₃COOH and 6 ppbv HCOOH. At South Pole the mixing ratios of these acids in the top 35 cm of firn air were also generally >1 ppbv, though their maximums …

Haptic Interface For Center Of Workspace Interaction, Rick Komerska, Colin Ware, Matt D. Plumlee

Center for Coastal and Ocean Mapping

We build upon a new interaction style for 3D interfaces, called the center of workspace interaction. This style of interaction is defined with respect to a central fixed point in 3D space, conceptually within arm's length of the user. For demonstration, we show a haptically enabled fish tank VR that utilizes a set of interaction widgets to support rapid navigation within a large virtual space. The fish tank VR refers to the creation of a small but high quality virtual reality that combines a number of technologies, such as head-tracking and stereo glasses, to their mutual advantage

Ulf Waves In The Solar Wind As Direct Drivers Of Magnetospheric Pulsations, L. Kepko, Harlan E. Spence, H. J. Singer

Physics & Astronomy

[1] Global magnetospheric ULF pulsations with frequencies in the Pc 5 range (f = 1.7–6.7 mHz) and below have been observed for decades in space and on the Earth. Recent work has shown that in some cases these pulsations appear at discrete frequencies. Global cavity and waveguide modes have been offered as possible sources of such waves. In these models the magnetosphere is presumed to resonate globally at frequencies determined solely by its internal properties such as size, shape, field topology, mass density distribution, etc. We show in this work that upstream solar wind number density and dynamic pressure …

Presidential Finalist Candidates And Schedules, Kim Billings

Media Relations

No abstract provided.

2001-02 Faculty Senate - March 25, 2002 Minutes Summary, Faculty Senate

Faculty Senate Agendas & Minutes

No abstract provided.

2001-02 Faculty Senate - March 25, 2002 Minutes Summary, Faculty Senate

Faculty Senate Agendas & Minutes

No abstract provided.

The New Hampshire, Vol. 91 [92], No. 38 (Mar. 12, 2002), The New Hampshire

The New Hampshire Print Edition

An independent student produced newspaper from the University of New Hampshire. This volume was printed as 91, but it is the 92nd volume in the series. This was corrected in pencil.

Bse: Risk, Uncertainty, And Policy Change, Enda Cummins, Pat Grace, Kevin Mcdonnell, Shane Ward

RISK: Health, Safety & Environment (1990-2002)

The authors discuss how, in our "risk society," a range of potential risks and uncertainties are associated with new technologies and new diseases, such as BSE. These risks bring with them worries about human health, while the ability to assess and manage new health scares is an essential skill for government and related industries.

Five-Hundred Life-Saving Interventions And Their Misuse In The Debate Over Regulatory Reform, Lisa Heinzerling

RISK: Health, Safety & Environment (1990-2002)

The author argues that John D. Graham, administrator of the Office of Information and Regulatory Affairs, holds strong anti-environmental biases and has perpetuated and encouraged a misrepresentation of his own research, which has largely influenced health, safety, and environmental regulation.

Environmental Risk Analysis: Problems And Perspectives In Different Countries, Bhola Ram Gurjar, Manju Mohan

RISK: Health, Safety & Environment (1990-2002)

The authors discuss various industrial accidents, which have led to growing concerns about the potential hazards and risks involved in chemical process industries.

Table Of Contents Volume 13, Number One, Winter 2002, Risk Editorial

RISK: Health, Safety & Environment (1990-2002)

Table of contents for the journal RISK: Health, Safety & Environment (ISSN: 1073-8673)

Review Of: Peter Hoffman, Tomorrow's Energy: Hydrogen, Fuel Cells, And The Prospects For A Cleaner Planet, William H. Shaw Iii

RISK: Health, Safety & Environment (1990-2002)

Review of the book: Peter Hoffman, Tomorrow's Energy: Hydrogen, Fuel Cells, and the Prospects for a Cleaner Planet (MIT Press 2001). Illustrations, Foreword, Acknowledgments, Notes, Index. ISBN 0-262-08295-0 [289 pp. $32.95. Cloth, 5 Cambridge Center, Cambridge, MA 02142- 1493].

Comparing Bottled Water And Tap Water: Experiments In Risk Communication, Branden B. Johnson

RISK: Health, Safety & Environment (1990-2002)

The author discusses results of experiments in risk communication comparing bottled water and tap water.

The New Hampshire, Vol. 91 [92], No. 34 (Feb. 26, 2002), The New Hampshire

The New Hampshire Print Edition

An independent student produced newspaper from the University of New Hampshire. This volume was printed as 91, but it is the 92nd volume in the series. This was corrected in pencil.

2001-02 Faculty Senate - February 25, 2002 Minutes Summary, Faculty Senate

Faculty Senate Agendas & Minutes

No abstract provided.