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: 5346
Communicating scientific findings to the general public
The Human Induced Land Transformation project (HILT), part of the U.S. Geological Survey Global Change Research Program, has generated considerable public interest during the first two phases of the project: the data assembly and visualization phase carried out for the San Francisco Bay area; and the model building and calibration phase. The third phase, now underway for the Washington/Baltimore r
Authors
Stacy Hoppen, Keith C. Clarke, Leonard J. Gaydos, William Acevedo
Design and documentation of a Baltimore-Washington regional spatial database testbed for environmental model calibration and verification
Recent efforts by scientists and managers to inventory, map, and model impacts of human activities on the environment have focused on land transformation and urbanization processes. To test the efficacy of any single model, algorithm or procedure which defines land transformation processes a standard database calibration reference resource is required. Therefore, a set of georeferenced, spatially
Authors
Timothy W. Foresman, Helen Wiggins, Dana Porter, Penny Masuoka, William Acevedo
Potential‐field continuation: Past practice vs. modern methods
No abstract available.
Authors
Jeffrey Phillips
Developing a temporal database of urban development for the Baltimore/Washington region
The U.S. Geological Survey (USGS), the University of Maryland Baltimore County (UMBC), and the U.S. Bureau of the Census are working together as a multiagency, multidisciplinary team in developing a temporal database that documents the growth of the Baltimore-Washington metropolitan region. This database consists of urban development, principal transportation, shoreline, and population density cha
Authors
Janet S. Tilley, William Acevedo, Timothy W. Foresman, Walter Prince
Methods and techniques for rigorous calibration of a cellular automaton model of urban growth
Several lessons about the process of calibration were learned during development of a self-modifying cellular automaton model to predict urban growth. This model, part of a global change research project on human-induced land transformations, was used to predict the spatial extent of urban growth 100 years into the future. The context of the prediction was to evaluate urban environmental disturban
Authors
Keith C. Clarke, Stacy Hoppen, Leonard J. Gaydos
A comparison of vitrinite reflectance measurements made on whole-rock and dispersed organic matter concentrate mounts
A comparison of mean-random vitrinite reflectance (R(v-r)) values calculated from measurements on polished whole-rock and on concentrates of dispersed organic matter (DOM) mounts of the same samples generally show little difference. Compared to measurements on DOM mounts, R(v-r) measurements by the same microscopist on corresponding whole-rock samples are up to a few tenths of a percent lower over
Authors
C. E. Barker
A watershed-scale approach to tracing metal contamination in the environment
IntroductionPublic policy during the 1800's encouraged mining in the western United States. Mining on Federal lands played an important role in the growing economy creating national wealth from our abundant and diverse mineral resource base. The common industrial practice from the early days of mining through about 1970 in the U.S. was for mine operators to dispose of the mine wastes and mill tail
Authors
Stanley E Church
Activity and feeding of ovigerous Dungeness crabs in Glacier Bay, Alaska
The activity and feeding behavior of ovigerous Dungeness crabs, Cancer magister, were examined as part of a long-term study. Part of this study surveyed Bartlett Cove in Glacier Bay, Alaska, during the spring of 1994 where 50 commercial pots were soaked for 24 hours. Catch per unit effort (CPUE), dispersion, and stomach samples of male, nonovigerous female, and ovigerous female crabs were compared
Authors
Deborah A. Schultz, Thomas C. Shirley, Charles E. O'Clair, S. James Taggart
Alaska shorebirds: status and conservation measures at a terminus of the East Asian-Australasian flyway
No abstract available.
Authors
Robert E. Gill
An introduction to the Woodworth Study Area
The Woodworth Study Area (WSA) was purchased by the U.S. Fish and Wildlife Service (FWS) during the early 1960's as a waterfowl production area. Unlike most such areas, its primary purpose was not to provide waterfowl breeding habitat directly, but instead it was dedicated for use as a research area to develop information for better management of upland and wetland habitats. This article provide
Authors
Douglas H. Johnson, Kenneth F. Higgins, Robert O. Woodward
Analysis of the mobility of far reaching debris flows on the Mississippi Fan, Gulf of Mexico
No abstract available.
Authors
J. Locat, H. J. Lee, H.C. Nelson, W. C. Schwab, D. C. Twichell
Artifact correction and absolute radiometric calibration techniques employed in the Landsat 7 image assessment system
The Landsat-7 Image Assessment System (IAS), part of the Landsat-7 Ground System, will calibrate and evaluate the radiometric and geometric performance of the Enhanced Thematic Mapper Plus (ETM +) instrument. The IAS incorporates new instrument radiometric artifact correction and absolute radiometric calibration techniques which overcome some limitations to calibration accuracy inherent in histori
Authors
Wayne C. Boncyk, Brian L. Markham, John L. Barker, Dennis Helder