Conference Papers
Science Quality and Integrity
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Striping artifact reduction in lunar orbiter mosaic images
Photographic images of the moon from the 1960s Lunar Orbiter missions are being processed into maps for visual use. The analog nature of the images has produced numerous artifacts, the chief of which causes a vertical striping pattern in mosaic images formed from a series of filmstrips. Previous methods of stripe removal tended to introduce ringing and aliasing problems in the image data. This pap
Authors
P.A. Mlsna, T. Becker
Tamarisk research priorities of land and water managers: results from a USGS partnership meeting
No abstract available.
Authors
L. Hanson, P.B. Shafroth, F. D'Erchia
Testing the concept of drift shadow at Yucca Mountain, Nevada
If proven, the concept of drift shadow, a zone of reduced water content and slower ground-water travel time beneath openings in fractured rock of the unsaturated zone, may increase performance of a proposed geologic repository for high-level radioactive waste at Yucca Mountain, To test this concept under natural-flow conditions present in the proposed repository horizon, isotopes within the uraniu
Authors
J.B. Paces, L.A. Neymark, T. Ghezzehei, P.F. Dobson
Texture analysis for automated classification of geologic structures
Texture present in aeromagnetic anomaly images offers an abundance of useful geological information for discriminating between rock types, but current analysis of such images still relies on tedious, human interpretation. This study is believed to be the first effort to quantitatively assess the performance of texture-based digital image analysis for this geophysical exploration application. We co
Authors
V. Shankar, J.J. Rodriguez, M. E. Gettings
The conservation and population status of the world's waders at the turn of the millennium
Using information from many sources, but especially data collated for the third edition of Wetlands International’s Waterbird Population Estimates, we review the status of the world’s waders in the late 1990s. There are widespread declines in most regions and biotopes caused principally by loss and degradation of wetland (and other) habitats. On different flyways, between 33%and 68% of populations
Authors
David A. Stroud, Andy Baker, D.E. Blanco, Nick C. Davidson, B. Ganter, Robert E. Gill, P.M. Gonzalez, L. Haanstra, R. I. G. Morrison, Theunis Piersma, D. Scott, O. Thorup, R. West, J.L. Wilson, Christoph Zöckler
The effect of the "Great Flood of 1993" on subsequent suspended sediment concentrations and fluxes in the Mississippi River Basin, USA
During the spring/summer of 1993, the upper Midwestern USA experienced unusually heavy precipitation (200-350% above normal). More than 500 gauging stations in the region were simultaneously above flood stage, and nearly 150 major rivers and tributaries over-topped their banks. This was one of the costliest floods in the history of the USA, and came to be known as the "Great Flood of 1993". An exa
Authors
A. J. Horowitz
The fifth International Geological Congress, Washington, 1891
The 5th International Geological Congress (IGC), the initial meeting in North America, was the first of the three IGCs that have been held in the United States of America (USA). Of the 538 registrants alive when the 5th IGC convened in Washington, 251 persons, representing fifteen countries, actually attended the meeting. These participants included 173 people from the USA, of whom forty-two repre
Authors
C.M. Nelson
The future of imaging spectroscopy - Prospective technologies and applications
Spectroscopy has existed for more than three centuries now. Nonetheless, significant scientific advances have been achieved. We discuss the history of spectroscopy in relation to emerging technologies and applications. Advanced focal plane arrays, optical design, and intelligent on-board logic are prime prospective technologies. Scalable approaches in pre-processing of imaging spectrometer data wi
Authors
M.E. Schaepman, R.O. Green, S.G. Ungar, B. Curtiss, J. Boardman, A.J. Plaza, B.-C. Gao, S. Ustin, R. Kokaly, J.R. Miller, S. Jacquemoud, E. Ben-Dor, R. Clark, C. Davis, J. Dozier, D.G. Goodenough, D. Roberts, G. Swayze, E.J. Milton, A. F. H. Goetz
The HRSC DTM test
The High Resolution Stereo Camera (HRSC) has been orbiting the planet Mars since January 2004 onboard the ESA Mars Express mission and delivers imagery which is being used for topographic mapping of the planet. The HRSC team is currently conducting a systematic inter-comparison of different alternatives for the production of high resolution Digital Terrain Models (DTMs) from the multilook HRSC pus
Authors
Christian Heipke, Jürgen Oberst, Jeorg Albertz, Maria Attwenger, Peter Dorninger, Egon Dorrer, M. Ewe, Stephan Gehrke, Klaus Gwinner, H. Hirschmuller, J.R. Kim, Randolph L. Kirk, H. Mayer, Jan-Peter Muller, Rajagopalan Rengarajan, M. Rentsch, R. Schmidt, Frank Scholten, J. Shan, Michael Spiegel, M. Wahlisch, Gerhard Neukum
The importance of physiological ecology in conservation biology
Many of the threats to the persistence of populations of sensitive species have physiological or pathological mechanisms, and those mechanisms are best understood through the inherently integrative discipline of physiological ecology. The desert tortoise was listed under the Endangered Species Act largely due to a newly recognized upper respiratory disease thought to cause mortality in individuals
Authors
C.R. Tracy, K.E. Nussear, T. C. Esque, K. Dean-Bradley, L.A. DeFalco, K.T. Castle, L.C. Zimmerman, R.E. Espinoza, A.M. Barber
The ionospheric impact on GPS performance in southern polar region
The primary objective of this paper is to present the results of the study of the effects of varying ionospheric conditions on the GPS signal tracking in the southern polar region. In the first stage of this study, the data collected by the OSU/USGS team in October-November 2003 within the TAMDEF (Transantarctic Mountains Deformation) network were used together with some IGS Antarctic stations to
Authors
C.-K. Hong, D. A. Grejner-Brzezinska, N. Arslan, M. Willis, L. Hothem