Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
Filter Total Items: 5560
Planetary geodesy and cartography at the USGS, Flagstaff: Moon, Mars, Venus, and beyond Planetary geodesy and cartography at the USGS, Flagstaff: Moon, Mars, Venus, and beyond
An important theme of our work is the synergistic use of a variety of geodetic, cartographic, and photogrammetric software packages. The USGS digital cartographic software system ISIS provides most of the processing capability needed for planimetric mapping tasks such as our revision of the global digital image mosaic of Mars (MDIM). The geodetic control network on which this mosaic is...
Authors
Randolph L. Kirk, Mark R. Rosiek, Elpitha Howington-Kraus, Eric M. Eliason, Brent A. Archinal, Ella M. Lee
A comparison of load estimates using total suspended solids and suspended-sediment concentration data A comparison of load estimates using total suspended solids and suspended-sediment concentration data
This paper presents the results to-date from a continuing investigation into the differences between total suspended solids (TSS) and suspended-sediment concentration (SSC) data and the ramifications of using each type of data to estimate sediment loads. It compares estimates of annual suspended-sediment loads that were made using regression equations developed from paired TSS and SSC...
Authors
G.D. Glysson, J. R. Gray, G. E. Schwarz
A comparison of U.S. geological survey seamless elevation models with shuttle radar topography mission data A comparison of U.S. geological survey seamless elevation models with shuttle radar topography mission data
Elevation models produced from Shuttle Radar Topography Mission (SRTM) data will be the most comprehensive, consistently processed, highest resolution topographic dataset ever produced for the Earth's land surface. Many applications that currently use elevation data will benefit from the increased availability of data with higher accuracy, quality, and resolution, especially in poorly...
Authors
D. Gesch, J. Williams, W. Miller
A Landsat 7 scene selection strategy for a national land cover database A Landsat 7 scene selection strategy for a national land cover database
A strategy for selecting Landsat 7 ETM+ imagery for development of a new generation national land cover database of the United States has been developed. This strategy is formulated to target Landsat 7 ETM+ scenes based on land cover and land use, vegetation phenology and image quality (cloudiness, haze). Criteria based on phenology and scene quality provide a national baseline for...
Authors
Limin Yang, Collin G. Homer, K. Hegge, Chengquan Huang, Bruce K. Wylie, Bradley C. Reed
A new lumbriculid genus and species from North America (Clitellata, Lumbriculidae) A new lumbriculid genus and species from North America (Clitellata, Lumbriculidae)
Secubelmis limpida n. sp., n. gen., is described from Montana, U.S.A. The monotypic genus resembles the lumbriculid genera Rhynchelmis and Tatriella in having atria in X, spermathecae in VIII, and semi-prosoporous male ducts. It differs from Tatriella in having paired atria and spermathecae, and from Rhynchelmis in having petiolate atria. The single prostate gland is unique within the
Authors
S.V. Fend, D.L. Gustafson
Absence of risk associated with movement of processed rainbow trout from an area where infectious hematopoietic necrosis virus is endemic Absence of risk associated with movement of processed rainbow trout from an area where infectious hematopoietic necrosis virus is endemic
Abstract not available
Authors
S. LaPatra, W. Batts, G. Jones, W. Shewmaker, J. Winton
Automated ground-water monitoring with robowell-Case studies and potential applications Automated ground-water monitoring with robowell-Case studies and potential applications
Robowell is an automated system and method for monitoring ground-water quality. Robowell meets accepted manual-sampling protocols without high labor and laboratory costs. Robowell periodically monitors and records water-quality properties and constituents in ground water by pumping a well or multilevel sampler until one or more purge criteria have been met. A record of frequent water...
Authors
G.E. Granato, K.P. Smith
Biodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions Biodegradation of MTBE by indigenous aquifer microorganisms under artificial oxic conditions
Oxygen in the form of a metal peroxide slurry (MgO2 and water) was added to an anoxic part of a gasoline-contaminated aquifer in South Carolina to test the hypothesis that artificial oxic conditions will lead to MTBE biodegradation by indigenous microorganisms in anoxic, gasoline-contaminated aquifers. The slurry slowly released dissolved oxygen upon hydrolysis with groundwater, and was...
Authors
J. E. Landmeyer, P. M. Bradley
Biophysical monitoring of a tidal salt marsh rehabilitation in the San Francisco Bay estuary Biophysical monitoring of a tidal salt marsh rehabilitation in the San Francisco Bay estuary
No abstract available at this time
Authors
S.J. Emerson, M.A. Bias, G.T. Downard, John Y. Takekawa
Changes in flow in the upper North Canadian river basin of western Oklahoma, pre-development to 2000 Changes in flow in the upper North Canadian river basin of western Oklahoma, pre-development to 2000
Water levels have declined in the southern part of the High Plains aquifer of the central USA since the mid-1960s in response to extensive irrigation development. The North Canadian River originates in western Oklahoma, and most of the basin is underlain by the High Plains aquifer. Average river flow in the headwaters near Guymon, Oklahoma, has decreased from about 0.9 m3/s before 1970...
Authors
K.L. Wahl
Coal bed sequestration of carbon dioxide Coal bed sequestration of carbon dioxide
Geologic sequestration of CO2 generated from fossil fuel combustion may be an environmentally attractive method to reduce the amount of greenhouse gas emissions. Of the geologic options, sequestering CO2 in coal beds has several advantages. For example, CO2 injection can enhance methane production from coal beds; coal can trap CO2 for long periods of time; and potential major coal basins...
Authors
Robert Stanton, Romeo M. Flores, Peter D. Warwick, Harold J. Gluskoter, Gary D. Stricker
Coal quality and resources in the U.S. Gulf Coastal Plain Coal quality and resources in the U.S. Gulf Coastal Plain
No abstract available.
Authors
Peter D. Warwick, John R. SanFilipo, Jason C. Willett