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Computational methods
Mathematical techniques used to analyze numerical data.
Subtopics:
Image analysis (6 items)
Mathematical modeling (97 items)
Spatial analysis (31 items)
Statistical analysis (21 items)
Topological analysis (1 items)
Visualization methods (5 items)

Results 1 - 149 of 155 listed by similarity [list alphabetically]
Development of computational fluid dynamics--habitat suitability (CFD-HSI) models to identify potential passage--Challenge zones for migratory fishes in the Penobscot River
Proposed removal of dams will change the characteristics of stream flow and will affect fish that swim upstream to spawn. A mathematical model of the river flow tells us where the likely problems will be located and how the flow will change.
Methods for estimating magnitude and frequency of floods in rural basins in the southeastern United States: South Carolina
Flood estimates are needed for the efficient design of bridges, highway embankments, levees, to protect lives and property in flood-prone areas, and to determine flood-insurance rates.
National Handbook of Recommended Methods for Water Data Acquisition -- Chapter 11 - Water Use
Provides standards and guidance for measuring, estimating, collecting, and analyzing water-use data. Includes brief descriptions of water-use activities, commonly used water-use terminology, and approaches and methods used in estimating water use.
A Magnitude 7.1 Earthquake in the Tacoma Fault Zone-A Plausible Scenario for the Southern Puget Sound Region, Washington
Scientific description of the likely effects of a significant earthquake on this densely populated area.
A Method for Qualitative Mapping of Thick Oil Spills Using Imaging Spectroscopy
A method to create qualitative images of thick oil in oil spills on water using near-infrared imaging spectroscopy data. It relies on the organic absorption features of chemical bonds in aliphatic hydrocarbons. The data cannot give oil volume estimates.
A New Method for Mapping Population Distribution
With the addition of elevation and land use and land cover data, we can show population density on a map much more effectively than if we simply color census areas. The resulting maps should allow better planning, especially in highly developed areas.
A new tool to assess groundwater resources in the Mississippi embayment
Mathematical model of the groundwater system in this area includes 13 types of data and spans multiple aquifers over more than a century. This enables us to assess the quantity of groundwater, where and how it is being used, and how pumping affects it.
A program for the conversion of The National Map data from proprietary format to resource description framework (RDF)
To expand data functionality and capabilities for users of The National Map of the U.S. Geological Survey, data sets for six watersheds and three urban areas were converted from the Best Practices vector data model formats to Semantic Web data formats.
A spatial analysis of cultural ecosystem service valuation by regional stakeholders in Florida: a coastal application of the social values for ecosystem services (SolVES) tool
Research project to close gaps in our knowledge about the attitudes and perceptions, or nonmonetary values, held by coastal residents for ecosystem services, particularly for cultural services.
A westward extension of the tropical Pacific warm pool leads to March through June drying in Kenya and Ethiopia
Analysis of sea-surface temperature in the Indian Ocean shows that warming correlates with east African rainfall; the effect on atmospheric convection and precipitation over the Indian Ocean is greater than that associated with El Niño (ENSO).
Acid Rain in Shenandoah National Park, Virginia
Explains acidity and acid rain and how it affects aquatic organisms. Describes the effect of acid rain on this national park, identifying areas that are at greater or lesser risk from acid rain.
New and experimental methods of analyzing geospatial imagery, including detailed spectral analysis of land surface materials, historical image analysis, and long wave infrared image analysis.
Clearinghouse for the description and availability of multiple geospatial datasets relating to Alaska from many federal, state and local cooperating agencies under the coordination of the Alaska Geographic Data Committee.
An Overview of the GIS Weasel
Software system designed to aid users in preparing spatial information as input to lumped and distributed parameter environmental simulation models.
ANALOG: a program for estimating paleoclimate parameters using the method of modern analogs
Scientific software used with faunal or floral census data to find the modern locations most similar to any given fossil assemblage. Source code is included.
Anticipated effects of development on habitat fragmentation and movement of mammals into and out of the Schoodic District, Acadia National Park, Maine
Wildlife you see in a national park or other reserved area don't know about the park boundary. Bobcat, martens, mink, and moose need different types of living space and habitat. Development outside the park affects their ability to inhabit the park.
Application of the SPARROW watershed model to describe nutrient sources and transport in the Missouri River Basin
Maps and diagrams showing how the mathematical model predicts the distribution of various pollutants within a large watershed.
Assessing carbon stocks, carbon sequestration, and greenhouse-gas fluxes in ecosystems of the United States under present conditions and future scenarios
Congress asked us (in the Energy Independence and Security Act of 2007) to figure out how to assess the effects of carbon storage, sequestration, and greenhouse gas fluxes in our ecosystems. Here's how we plan to do that.
Assessing groundwater availability in the North Atlantic Coastal Plain aquifer system
Nature, history, and distinctive characteristics of this aquifer system help us to understand the likely distribution of available groundwater.
Assessing the vulnerability of public-supply wells to contamination--Edwards aquifer near San Antonio, Texas
Well vulnerability results from the young age of groundwater. Karst features permit contaminants to move into the aquifer easily, leading to a well mixed aquifer; geochemical processes do not degrade contaminants quickly.
Assessing the Vulnerability of Public-Supply Wells to Contamination: Central Valley Aquifer System near Modesto, California
Using ground-water geochemical analyses, and mathematical models, the factors affecting the quality of public water supply were identified as pumping schedule, screened interval, past land use within the recharge area, and natural geochemical conditions.
Assessing the Vulnerability of Public-Supply Wells to Contamination: Floridan Aquifer System Near Tampa, Florida
Using ground-water geochemical analyses and mathematical models, the factors affecting the quality of public water supply were identified as mixing of very recent recharge with older water, karst features, natural geochemical processes, and pumping.
Assessing the vulnerability of public-supply wells to contamination: Rio Grande aquifer system in Albuquerque, New Mexico
Explains the natural and human-affected factors that determine the concentration of contaminants in groundwater, especially where the concentration is different at the surface than at depth, and where pumping varies with time.
Assessment of least tern and piping plover habitats on the Missouri River using remote sensing
Analysis and modeling of multispectral imagery helps to predict the suitability of sand bars for nesting of these migratory birds.
Assessment of potential additions to conventional oil and gas resources of the world (outside the United States) from reserve growth, 2012
We used mathematical models to estimate the likely increases in the estimates of the amount of oil and gas technically recoverable from existing known large fields outside the US.
Avian conservation in the Prairie Pothole Region, Northern Great Plains-Understanding the links between climate, ecosystem processes, wetland management, and bird communities
Small wetlands in this large area have hosted migratory birds for a long time, but with changes in agricultural practice and regional climate those habitats may not remain hospitable to the wild populations.
Biological resource status and trends: Conceptual modeling
Information concerning status and trends of biological resources, focusing on conceptual modeling
Biological resource status and trends: Modeling
Information concerning status and trends of biological resources, focusing on modeling
Biological resource status and trends: Predictive modeling
Information concerning status and trends of biological resources, focusing on predictive modeling
Biological resource status and trends: Statistical anaysis
Information concerning status and trends of biological resources, focusing on statistical analysis methods
Biological resource status and trends: Statistical packages (software)
Information concerning status and trends of biological resources, focusing on statistical packages (software)
Boston Harbor Studies: the fate of sediments and contaminants in Massachusetts Bay
Boston Harbor/Massachusetts Bay Studies research project conducted as part of Boston Harbor cleanup to predict the fate of contaminants and sediments introduced to Massachusetts' coastal waters from sources that include Boston sewage outfall.
Calculating weighted estimates of peak streamflow statistics
A method of improving our estimates of statistics used to describe flood frequency, taking into account information obtained from the stream whose flood frequency is being investigated.
California's Central Valley Groundwater Study: A Powerful New Tool to Assess Water Resources in California's Central Valley
Modeling effort that integrates a wide variety of geographic, hydrologic, agricultural, climatic, and biological information to help local land managers address resource use issues.
Cascadia subduction zone: two contrasting models of lithospheric structure
Summary of an investigation of the Cascadia subduction zone with detailed density-modeling experiments of the crust and mantle along two transects across Vancouver Island and the Canadian margin and the other on the margin of central Oregon.
Changing Arctic ecosystems-Research to understand and project changes in marine and terrestrial ecosystems of the Arctic
Three themes of ongoing research: forecasting polar bear and walrus population response to changing marine ecosystems; measuring wildlife population changes in the Arctic coastal plain, and wildlife communities in the boreal-Arctic transition zone.
Changing Arctic Ecosystems: Updated forecast: Reducing carbon dioxide (CO2) emissions required to improve polar bear outlook
Polar bears are endangered by reduction in Arctic sea-ice concentration and by reduction in their supply of prey for food. Models shown here indicate anticipated effects on polar bear populations of several climate change scenarios.
Coastal ocean modeling at the USGS Woods Hole Field Center
Fly-by and circulation movies, effluent concentration, tidal flushing, sea level, and temperature in Massachusetts Bay and Boston Harbor
Columbia Environmental Research Center
Website for the Columbia Environmental Research Center with links to staff, publications, databases, field stations, and projects including those on the Rio Grande, burrowing owls, sea turtles, and geospatial technology.
Columbia River USGS Interdisciplinary Science Explorer WebSite
Web site for an Internet Map Service (IMS) serving base cartographic data, USGS data, science applications and real time modelling analyses for the Columbia River basin using geospatial analysis technology.
Community model for coastal sediment transport
Description of the National Community Sediment-Transport Model (NCSTM), an open source numerical model for sediment transport in coastal regions.
Computer simulation of reservoir depletion and oil flow from the Macondo well following the Deepwater Horizon blowout
This model estimates, by simulation, the reservoir pressure, flow rate, and volume of oil discharged, and the report discusses the uncertainty in the estimates.
Costly landslide events in the United States: map layer description file
GIS data set from the USGS National Landslides Hazards Program showing major landslide events in the United States and Puerto Rico with metadata. Map layer can be downloaded in shapefile format or SDTS format.
Data visualization tools used in studies of the upper Mississippi River and nearby areas
Interactive maps and databases showing geospatial, biologic, and ecological aspects of the upper Mississippi River. Includes water quality, fish species, and vegetation distribution as well as geographic reference information.
Datum shifts and digital map coordinate displays
Online GIS training course for users in GIS environments in resolving the differences in distances and coordinate readouts due to shifts in the 1927 and 1983 North American Datums when using Universal Transverse Mercator (UTM) grids.
Decision-support systems for natural-hazards and land-management issues
Three mathematical models using information about the geographic distribution and character of land surface characteristics along with proposed modifications or plausible events to determine the likely costs and benefits of actions and events.
Development of a global slope dataset for estimation of landslide occurrence resulting from earthquakes
Technical description of methods used to generate global slope data from SRTM topography data
Discontinuous nature of kriging digital terrain models
Research exploring the mathematical properties of kriging, a widely-used surface interpolation method. The continuity properties of kriging digital terrain models over a wide range of terrain types helps hydrologists assess the usefulness of kriging for D
Drought and deluge: Effects of recent climate variability on groundwater levels in eastern Arkansas
Water levels in wells completed in the Mississippi River Valley alluvial aquifer and the Sparta aquifer in eastern Arkansas respond to variability associated with annual precipitation.
Drought Monitoring with VegDRI
The Vegetation Drought Response Index is a drought monitoring and mapping tool integrating satellite observations of vegetation and climate with land cover, soil characteristics, and other environmental factors.
Numerous downloadable software packages for carrying out analyses, modeling, and ancillary calculations in earthquake research and monitoring.
Eastern Geographic Science Center
Programs, projects, laboratories, and publications related to geographic information science in the eastern United States
End-of-month hydrologic condition reports for New York State
Site to locate most recent or archive reports for end-of-the-month hydrologic conditions with descriptions, data, charts, and maps giving an overview of water conditions during the month for the state of New York.
EverView Data Viewer
Software and data to help people model the likely response of populations of organisms to various strategies that might be employed to remedy the effects of damaged ecosystems.
Evolution of 3-D geologic framework modeling and its application to groundwater flow studies
Methods to depict the connectedness of rock units across fault and fracture zones, allowing us to determine the distribution of geologic units, structural features, and other controlling factors, such as porosity and permeability.
Flood frequency
Links to Office of Surface Water memos, reference publications, training guides, and software for computing flood frequency.
Forecasting the effects of land-use and climate change on wildlife communities and habitats in the lower Mississippi Valley
Describes the analytical process by which spatial scientific information contributes to forecasts and models in support of regional and local decision-making.
Forum on Wildlife Telemetry - Innovations, Evaluations, and Research Needs
Papers from Forum on Wildlife Telemetry, Snowmass Village, CO, 1997 about innovations in transmitting and receiving systems, attachment techniques, collection of data using telemetry, data processing and analysis. Available as *.zip file to download.
Geographic Analysis and Monitoring Program
Geographic Analysis and Monitoring Program (GAM) conducts studies about land surface change, environmental and human health, fire and urban ecology, and natural hazards to help decision-makers in land-use planning and land management.
Descriptions, results, and data on research projects using geographic analysis and monitoring and remote sensing to study ecosystems and land processes in the Arctic region.
Geomagnetic models
Description of magnetic models with link to on-line calculation, freeware calculator (DOS and Windows), descriptions of model types, and references.
Ground water information pages
Lead page to connect to ground water information on the Nation's ground water resources and ground water activities of the USGS. Includes links to ground-water data, news reports, publications, field techniques, models, programs, and issues.
Ground-water flow and other computer simulations for Utah
Identifies computer models in USGS publications developed to study ground water for many areas of Utah.
Hawaii StreamStats; a web application for defining drainage-basin characteristics and estimating peak-streamflow statistics
Interactive maps providing selected analyses on areas you choose
Hazards, disasters, and the National Map
Fact sheet describing the value of The National Map designed as a network of digital databases that will provide a consistent national geographic data framework in responding to natural hazards and human-induced disasters.
Historical changes in annual peak flows in Maine and implications for flood-frequency analyses
Annual peak flows have increased at most rivers in Maine during the last century. What effect does this have on computed peak flows, such as the 100-year flows, that are used for designing bridges and other structures?
Housing arrangement and location determine the likelihood of housing loss due to wildfire
Using a geographic dataset of structures, with more than 5500 structures that were destroyed or damaged by wildfire since 2001, we identified the main contributors to property loss in two extensive, fire-prone regions in southern California.
Hydraulics Laboratory
Includes an indoor hydraulics laboratory available for rent. Links to meter calibrations, current meter performance, and modeling activities.
Impacts and predictions of coastal change during hurricanes
Shows how observations and modeling can help anticipate practical problems in coastal areas when hurricanes arrive. Focuses primarily on areas where people have built houses and roads that may be destroyed during storms.
Impacts of Low-Flow and Stream-Temperature Changes on Endangered Atlantic Salmon - Current Research
Recent physical changes over time, including trends toward earlier snowmelt runoff, decreasing river ice, and increasing spring water temperatures, may affect salmon populations; we want to know how important these effects are.
Integrated Science: Florida Manatees and Everglades Hydrology
Description of research and monitoring work proposed for 2008 to combine hydrologic models with manatee distribution and movement models near and within Everglades National Park.
International Program at the Earth Resources Observation Systems (EROS) Data Center - environmental monitoring and information systems
Overview of the environmental monitoring component of the international program at the EROS Data Center using Geographic Information Systems (GIS) technology, with links to data, partners, publications, and workshops.
Land Processes Distributed Active Archive Center (DAAC)
Homepage of the Land Processes DAAC, which processes, archives, and distributes land-related data collected by Earth Observing System (EOS) sensors. Links to data products including ETM+ Landsat data, ASTER data, and MODIS land products.
Land-use and land-cover scenarios and spatial modeling at the regional scale
Complex geographic information can be analyzed with mathematical models to show us the spatial patterns of human building, vegetation growth, and other landscape characteristics that may result from environmental changes we may expect in the future.
Land-use planning for nearshore ecosystem services--the Puget Sound Ecosystem Portfolio Model
Describes the types of concerns and observations used to help area resource managers analyze actual or potential changes in this highly developed ecosystem.
Landscape consequences of natural gas extraction in Allegheny and Susquehanna Counties, Pennsylvania, 2004--2010
Quantifies the landscape changes and consequences of natural gas extraction by digitizing indications of disturbance on NAIP aerial photographs and using these with the NLCD to show land use-land cover change.
Landscape consequences of natural gas extraction in Bradford and Washington Counties, Pennsylvania, 2004-2010
Quantifies the landscape changes and consequences of natural gas extraction by digitizing indications of disturbance on NAIP aerial photographs and using these with the NLCD to show land use-land cover change.
Mapping grasslands suitable for cellulosic biofuels in the Greater Platte River Basin, United States
Study to identify grasslands that may be suitable for cellulosic feedstock production. Producing ethanol from non-cropland areas such as grassland will minimize the effects of biofuel developments on global food supplies.
Mapping, monitoring, and modeling Western Gateway Community landscape dynamics
Geospatial analysis of factors affecting communities that are adjacent to Federal lands, especially those lands subject to varying public interest and visitation.
Middleton (Wisconsin) Data Center
Technical information about several water resource database projects with local, regional, and national scope including the National Environmental Methods Index, the National Water Quality Assessment Data Warehouse, and the USGS Publications Warehouse.
Mineral deposit models
National Geomagnetism Program
Overview of USGS programs related to geomagnetism including observatories, data, program services, links to models, charts, and movies, program contacts, Intermagnet, Geomag, publications, and bibliographies.
National Water-Quality Assessment (NAWQA) Program
Primary homepage for the National Water Quality Assessment (NAWQA) Program studying water quality in river, aquifer and coastal water basins throughout the nation. Links to reports, data, models, maps and national synthesis studies.
Net Ecosystem Production (NEP) of the Great Plains, United States
Geographic analysis of the changes in storage and release of carbon in this large area as land use patterns, especially agriculture, have changed.
Pennsylvania fractured rock hydrology research
Links to reports for Pennsylvania on borehole geophysical studies, aquifer tests and properties, modeling, and hydrologic effects of an earthquake with links to MOC3D solute transport software package, program mission, and bibliography.
Possible effects of groundwater pumping on surface water in the Verde Valley, Arizona
We applied a groundwater model to simulate effects of groundwater pumping and artificial recharge on surface water in this area. Results show effects of pumping or recharge on streamflow.
Publications on Techniques of Water-Resources Investigations
List of publications in the series Techniques of Water-Resources Investigations on the procedures for the planning and conducting of specialized research in water resources.
Radio tracking manatees to assess the impact of hydrologic changes in southwest Florida
Report on the Sirenia Project use of a radio tracking study to determine manatee movement patterns and habitat to develop ecological models to understand and predict the effects of hydrologic restoration on manatees in Southwest Florida.
Real-time water-quality monitoring and regression analysis to estimate nutrient and bacteria concentration in Kansas streams.
Report on the use of regression equations from measurements made by water quality monitors and analytical results of manually collected samples estimating nutrient, bacteria, and other constituent concentrations to study streams in Kansas.
Regional assessments of the Nation's water quality--Improved understanding of stream nutrient sources through enhanced modeling capabilities
Studies of the sources, transport, and fate of nutrients in the streams of six major regions of the conterminous United States.
Regional climate change--Science in the Southeast
Research projects intended to create regional and national data that conform to conditions predicted by general circulation models, so that land and wildlife managers can understand the likely consequences of climatic changes in their areas of study.
Report of the Community Sediment Transport Modeling Workshop
Report on workshop to explore a community approach to improving deterministic models of sediment transport in coastal seas, estuaries, and rivers.
Research and management techniques for wildlife habitats: Geographic information systems
Chapter on geographic information systems from a Wildlife Society publication with detailed information on geographic information systems, data structure, image processing, data analysis, application to waterfowl management, and data sources.
Resource materials for a GIS spatial analysis course
This report consists of materials prepared for a GIS spatial analysis course intended for instructors preparing spatial-modeling training and scientists with advanced GIS expertise. Downloads available in many formats (PDF, ArcView, Word, etc.)
Review of flow rate estimates of the Deepwater Horizon oil spill
We assess the degree to which a consensus was reached on the flow rate of the well by comparing in situ observations with a time-dependent flow rate model derived from pressure readings taken after the Macondo well was shut in for the well integrity test.
Rocky Mountain Geographic Science Center
A wide variety of web interfaces providing scientific information in geographic form for exploration and analysis, developed by this organization that focuses on geospatial analysis.
SAGEMAP: a web-based spatial dataset for sage grouse and sagebrush steppe management in the Intermountain West
Links to fact sheet describing the database of spatial information on sage grouse and sagebrush habitats.
San Francisco Bay bathymetry web site
Provides location-depth grids of bathymetry available for San Francisco Bay and tools for examining those grids. Data provided as GIS grids and animations.
San Francisco Bay Region geology
Gateway to the geology of the San Francisco Bay region with links to geologic maps, paleontology, marine geology, earthquakes, landslides, and geophysics. Includes maps, 3-D models, and photos.
Science from genes to landscapes
Explains USGS scientific research and monitoring activities focused on ecosystems, with examples from emerging diseases, invasive species, rangeland fire, and the complex interactions among organisms and human activities.
Science to support the understanding of south Texas surface-water and groundwater resources in a changing landscape
Short descriptions of the research and monitoring activities we are carrying out to assist state, local, and Federal agencies dealing with water resource issues in the southern part of the state.
SEAWAT: A Computer Program for Simulation of Variable-Density Groundwater Flow and Multi-Species Solute and Heat Transport
Software based on the MODFLOW modeling framework, used for studies of saltwater intrusion coastal aquifers, storage and recovery in brackish limestone aquifers, and brine migration in continental aquifers.
Slope-Area Computation Program Graphical User Interface 1.0--A Preprocessing and Postprocessing Tool for Estimating Peak Flood Discharge Using the Slope-Area Method
Explains how to use this command-line software to estimate peak flood discharge using indirect measures such as high water marks on trees or buildings.
SolVES - Social values for ecosystem services
GIS application for assessing, mapping, and quantifying the social value of ecosystem services. Helps decision makers consider tradeoffs among them with the human attitudes and preferences that express underlying social values.
Source, Use, and Disposition of Freshwater in Puerto Rico, 2005
Quantitative analysis of water use statistics for Puerto Rico, showing domestic, agricultural, industrial, and electric power as the main offstream uses.
South Florida Information Access (SOFIA) data exchange
Provides links to the data, models and maps on the biology, ecology, geology, mapping, hydrology, and chemistry of research studies in southern Florida.
South Florida Information Access (SOFIA) projects by topic
Links to explore South Florida and the Everglades ecosystem projects arranged by topic and subtopic, including proposals, project summaries, scopes of work, work plans, publications, and contacts.
Southeastern Amphibian Research and Monitoring Initiative
Overview of the Southeastern Amphibian Research and Monitoring Initiative, annual report, field methods and protocols, statistical design and analysis, glossary, projects, and lists of frogs, toads and salamanders.
SPARROW Modeling of Surface-Water Quality
A software model for regional interpretation of water-quality monitoring data, estimating origin and fate of contaminants in streams, with documentation, publications and data for the applications.
Spatial Analysis Branch, National Wetlands Research Center
Home page for National Wetlands Research Center's (NWRC) Spatial Analysis Branch (SAB), which uses state-of-the-art technology to assist the work of natural resource managers with spatial data and computerized analysis techniques.
Streamflow statistics for US states
Streamflow statistics and basin characteristics for most streams in specific US states using the Streamstats program. Data for areas can be selected from interactive maps and by an automated process. Includes a tutorial.
Summary of the reconnaissance investigation of the diamond resource potential and production capacity of Côte d'Ivoire
Study integrating archival reports and maps, satellite imagery, and terrain modeling to estimate resource reserves of 11,200,000 carats in two regions of the country.
Surface-water quality and flow Modeling Interest Group (SMIG)
The USGS Surface-water quality and flow Modeling Interest Group (SMIG) is interested in surface-water quality and flow modeling activities with links to articles, model archives, data archives, clearinghouse, mailing list, classes, and meetings.
Surface-water reports
Links to Office of Surface Water reports on streamgaging, streamflow data and information, current meters, sediment, modeling, journal articles, and techniques.
Terrestrial essential climate variables (ECVs) at a glance
Explains 16 distinct types of scientific information that are needed to understand climate change, including the specific parameters measured, why they are needed, who measures them, and the type and amount of information that are not yet available.
The Earth's crust
Information on the Earth's crust with a contour map of the thickness plus links to a global crustal database, a global crustal model - CRUST 5.1, and regional crustal models.
The Midwest Stream Quality Assessment
Upcoming interagency study to assess status of ecological conditions, their relationships with contaminants and nutrients, anthropogenic factors affecting these, and develop models that may predict these ecological conditions.
The National Land Cover Database
The National Land Cover Database (NLCD) serves as the definitive Landsat-based, 30-meter resolution, land cover database for the Nation.
The National Map
Homepage describing The National Map, which will produce a seamless, continuously maintained set of public domain geographic base information, with links to map viewer, pilot projects, reports, fact sheets, and national atlas.
Three-dimensional geologic maps and visualization
Techniques of computer-based representations of areal geology to construct three-dimensional geologic maps that retain all the information of traditional geologic maps while providing a more detailed picture of the subsurface.
Trumpeter swan
Studies of the trends of the Rocky Mountain population of trumpeter swans using time series analysis.
U.S. Geological Survey methodology development for ecological carbon assessment and monitoring
To assess the effectiveness of ecological carbon sequestration, we plan to define ecosystem reporting units, model baseline and potential carbon sequestration, develop spatial models that simulate ecosystems, and integrate remote sensing data.
UCERF3: A new earthquake forecast for California's complex fault system
Explains how we estimate the probability of earthquakes in the state of California. The underlying scientific model was improved to account for factors that can affect the severity of earthquakes.
Understanding beach health throughout the Great Lakes-Entering a new era of investigations
People who manage recreational areas need better, more timely estimates of the likelihood that the beach and lake waters will be hazardous to human health, and which factors cause those hazards.
United States Geological Survey (USGS) natural hazards response
The primary goal of U.S. Geological Survey (USGS) Natural Hazards Response is to ensure that the disaster response community has access to timely, accurate, and relevant geospatial products, imagery, and services during and after an emergency event.
Use of Light Detection and Ranging (LiDAR) to Obtain High-Resolution Elevation Data for Sussex County, Delaware
Methods and techniques used to collect and process LiDAR elevation data, the generation of the digital elevation model (DEM) and the 2-foot contours, and the quality-assurance procedures and results.
Use of Minerals and Materials in the United States From 1900 Through 2006
Types and quantities of raw materials used by U.S. manufacturers and consumers, which have changed significantly as the economy has moved from one that is predominantly agricultural to one that is primarily industrial.
USGS and the Southern California Integrated GPS Network (SCIGN)
Field Office involved in operating GPS stations, data recording, and supplying of earthquake data. Links to GPS data analysis, photos, and technical information.
USGS National Map of Surficial Mineralogy
Maps of exposed surface mineral groups derived from automated spectral analysis of satellite and airborne imaging systems; these data suggest areas that may contain mineral deposits of various types.
Using geochemical and statistical tools to identify irrigated areas that might contain high selenium concentrations in surface water
Program using pattern recognition analysis and classification models to determine areas of irrigated land with concentrations of selenium.
Using models for the optimization of hydrologic monitoring
Usually we choose to put water monitoring stations in places where we have no data already. But it's more efficient to place stations so that they help to reduce uncertainty in the results of modeling. This analysis shows how to choose.
Visualization of flow alternatives, Lower Missouri River
This report presents a visual, statistical presentation of five modeled flow-management alternatives and two reference alternatives for four selected sites on the Lower Missouri to aid in decision making for flow management of the river.
Visualizing NetCDF Files by Using the EverVIEW Data Viewer
Scientific software providing graphical displays of data in NetCDF format as spatial overlays on a three-dimensional globe and views of grid-cell values in tabular form.
Water resources applications software: NCALC, Manning's n value calculation program
Software for calculating Manning's roughness coefficient values in stream channels with installation instructions for Unix and DOS systems.
Water resources of Virginia - floods
Brief description of project for the Federal Emergency Management Agency to prepare and modify Flood Insurance Rate Maps based on flood frequency analysis, ground surveys, and flood profiles in Virginia.
Watershed modeling
Description of the development and use of models to study watersheds supporting a broad range of applications and user skills. Includes links to related memos, training, software, projects, and references
Watershed modeling applications in south Texas
Explains how mathematical simulations of watershed properties can help us understand the likely behavior of the water systems, putting the choices available to people in better perspective.
Watershed processes and modeling
Links to published materials produced by the Watershed Processes and Modeling Project on watershed model TOPMODEL, compilation of STATSGO soils data, climate change, landscape heterogeneity in ecoregions, and other links.
Watershed scale response to climate change--Black Earth Creek Basin, Wisconsin
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Cathance Stream Basin, Maine
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Clear Creek Basin, Iowa
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--East River Basin, Colorado
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Feather River Basin, California
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Flint River Basin, Georgia
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Naches River Basin, Washington
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Pomperaug River Watershed, Connecticut
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Sagehen Creek Basin, California
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Sprague River Basin, Oregon
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
Watershed scale response to climate change--Starkweather Coulee Basin, North Dakota
Mathematical models predict overall streamflow, runoff, subsurface flow, groundwater flow, and soil moisture in this area in response to four different greenhouse gas emission scenarios.
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Alphabetical Index of Topics

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.usgs.gov/science//science/science.php?thcode=2&term=189&b=0&n=149