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: 5599
Use of models to map potential capture of surface water Use of models to map potential capture of surface water
The effects of ground-water withdrawals on surface-water resources and riparian vegetation have become important considerations in water-availability studies. Ground water withdrawn by a well initially comes from storage around the well, but with time can eventually increase inflow to the aquifer and (or) decrease natural outflow from the aquifer. This increased inflow and decreased...
Authors
Stanley A. Leake
Topomapping of Mars with HRSC Images, ISIS, and a commercial stereo workstation Topomapping of Mars with HRSC Images, ISIS, and a commercial stereo workstation
We demonstrate that the freely available USGS planetary cartography software package ISIS and the commercial photogrammetric software SOCET SET jointly provide a complete environment for the processing of Mars Express High Resolution Stereo Camera (HRSC) images. Capabilities include bundle adjustment, automated production and interactive editing of stereo digital terrain models (DTMs)...
Authors
Randolph L. Kirk, Elpitha Howington-Kraus, Donna M. Galuszka, Bonnie L. Redding, Trent M. Hare
Stability of Landsat-4 thematic mapper outgassing models Stability of Landsat-4 thematic mapper outgassing models
Oscillations in radiometric gains of the short wave infrared (SWIR) bands in Landsat-4 (L4) and Landsat-5 (L5) Thematic Mappers (TMs) are observed through an analysis of detector responses to the Internal Calibrator (IC) pulses. The oscillations are believed to be caused by an interference effect due to a contaminant film buildup on the window of the cryogenically cooled dewar that...
Authors
Esad Micijevic, Gyanesh Chander
State-parameter estimation of ecosystem models using a smoothed ensemble Kalman filter State-parameter estimation of ecosystem models using a smoothed ensemble Kalman filter
Much of the effort in data assimilation methods for carbon dynamics analysis has focused on estimating optimal values for either model parameters or state variables. The main weakness of estimating parameter values alone (i.e., without considering state variables) is that all errors from input, output, and model structure are attributed to model parameter uncertainties. On the other hand...
Authors
M. Chen, Shuguang Liu, Larry L. Tieszen
Uncertainty management, spatial and temporal reasoning, and validation of intelligent environmental decision support systems Uncertainty management, spatial and temporal reasoning, and validation of intelligent environmental decision support systems
There are inherent open problems arising when developing and running Intelligent Environmental Decision Support Systems (IEDSS). During daily operation of IEDSS several open challenge problems appear. The uncertainty of data being processed is intrinsic to the environmental system, which is being monitored by several on-line sensors and off-line data. Thus, anomalous data values at data
Authors
Miquel Sanchez-Marre, Karina Gilbert, Rick S. Sojda, Jean Philippe Steyer, Peter Struss, Ignasi Rodriguez-Roda
Upscaling terrestrial carbon dynamics from sites to regions with uncertainty measures—The GEMS experience Upscaling terrestrial carbon dynamics from sites to regions with uncertainty measures—The GEMS experience
No abstract available.
Authors
Shuguang Liu, Z. Li, Jinxun Liu, Thomas Loveland, M. Chen, Larry L. Tieszen
Resolving model parameter values from C and N stock measurements in a wide range of tropical mature forests using nonlinear inversion Resolving model parameter values from C and N stock measurements in a wide range of tropical mature forests using nonlinear inversion
No abstract available.
Authors
Shuguang Liu, Pamela Anderson, Guoyi Zhou, Boone Kauffman, Flint Hughes, David Schimel, Vicente Watson, Joseph Tosi
Dealing with uncertainty and sensitivity issues in process-based models of carbon and nitrogen cycles in northern forest ecosystems Dealing with uncertainty and sensitivity issues in process-based models of carbon and nitrogen cycles in northern forest ecosystems
Many process-based models on carbon (C) and nitrogen (N) cycles have been developed for northern forest ecosystems. These models are widely used to evaluate the long-term decisions in forest management dealing with effects like particulate pollution, productivity and climate change. Regarding climate change, one of the key questions that have sensitive political implications is whether...
Authors
Guy R. Larocque, Jagtar S. Bhatti, A.M. Gordon, N. Luckai, Jinxun Liu, Shuguang Liu, P.A. Arp, C.F. Zhang, A Komarov, P. Grabarnik, M. Wattenbach, C. Peng, Jianfeng Sun, Thomas White
A tool for assessing mercury loadings from restored tidal systems A tool for assessing mercury loadings from restored tidal systems
Accurately quantifying net loads in tidal systems is difficult owing to the high variability in constituent concentrations over the vastly different time scales present in these systems. Perhaps most difficult is the measurement of fluxed over the tidal time scale. On this scale, the net export of the constituent is orders of magnitude less than the bulk exchange in either direction...
Authors
J.A. Fleck, B.A. Bergamaschi, B.D. Downing, M. A. Lionberger, D. H. Schoellhamer, E. Boss, M. Stephenson
Sediment supply and demand for salt pond restoration Sediment supply and demand for salt pond restoration
No abstract available.
Authors
David H. Schoellhamer, James L. Orlando, Scott Wright, Larry A. Freeman
Applications of geophysical methods to volcano monitoring Applications of geophysical methods to volcano monitoring
The array of geophysical technologies used in volcano hazards studies - some developed originally only for volcano monitoring - ranges from satellite remote sensing including InSAR to leveling and EDM surveys, campaign and telemetered GPS networks, electronic tiltmeters and strainmeters, airborne magnetic and electromagnetic surveys, short-period and broadband seismic monitoring, even...
Authors
Jeff Wynn, Daniel Dzurisin, Carol A. Finn, James P. Kauahikaua, Richard G. Lahusen
Magnetic properties, acid neutralization capacity, and net acid production of rocks in the Animas River Watershed Silverton, Colorado Magnetic properties, acid neutralization capacity, and net acid production of rocks in the Animas River Watershed Silverton, Colorado
Federal land managers along with local stakeholders in the Upper Animas River watershed near Silverton, Colorado are actively designing and implementing mine waste remediation projects to mitigate the effects of acid mine drainage from several abandoned hard rock metal mines and mills. Local source rocks with high acid neutralization capacity (ANC) within the watershed are of interest to...
Authors
Anne E. McCafferty, Douglas B. Yager, Radley M. Horton, Sharon F. Diehl