Data and Tools
Science Datasets
Science Datasets
The data collected and the techniques used by USGS scientists should conform to or reference national and international standards and protocols if they exist and when they are relevant and appropriate. For datasets of a given type, and if national or international metadata standards exist, the data are indexed with metadata that facilitates access and integration.
2020 Known and Probable Grizzly Bear Mortalities in the Greater Yellowstone Ecosystem
Identifying the locations and causes of grizzly bear mortality is another key component in understanding the dynamics of this population. Over 80% of all documented bear mortalities are human-caused. Tracking human-caused bear deaths helps define patterns and trends that can direct management programs designed to reduce bear mortality.
Lake Trout Otolith Growth Increment Measurements, Lake Clark National Park and Preserve, Alaska, 1979-2012
This data set documents the width of annual otolith growth increments from Lake Trout collected in lakes within Lake Clark National Park and Preserve, Alaska. The analysis of this data was published in von Biela et al. 2020 (DOI: 10.1111/eff.12566)
Bed sediment properties in Little Holland Tract and Liberty Island, Sacramento-San Joaquin Delta, California, 2014 to 2019 (ver. 2.0, May 2020)
Bed sediments were collected in two submerged agricultural tracts. Samples were analyzed for grain size distribution, bulk density, or both, from multiple locations during surveys from 2014-2019. This effort was part of a large study to investigate how shallow water habitats in the Delta function and whether they provide good habitat for native fish species, including the Delta smelt.
Field measurements of water depth from the American River, California, November 5-7, 2018
Field measurements of water depth were acquired from a reach of the upper American River in California, November 5-7, 2018, to support research on mapping salmon spawning locations (redds) via remote sensing. The depth measurements included in this data release were obtained by wading the shallow channel margins with RTK GPS receivers and measuring water surface elevations along the wat
Floating and Towed Transient Electromagnetic Surveys used to Characterized hydrogeology underlying Rivers and Estuaries: March to December 2018
Surface and water-borne geophysical methods can provide information for the characterization of the subsurface structure of the earth for aquifer investigations. Floating and towed transient electromagnetic (FloaTEM and tTEM) surveys provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through
Field spectra from salmon spawning locations on the American River, California, November 5-7, 2018
This child data release includes field spectra obtained as part of a study focused on mapping salmon spawning locations along the American River near Sacramento, California, via remote sensing; the data were collected November 5-7, 2018. The purpose of this study was to develop and test a spectrally based technique for identifying salmon spawning locations, known as redds, from vario
Floating transient electromagnetic (FloaTEM) surveys in the Rainbow Reservoir near Windsor, Connecticut
Floating transient electromagnetic (FloaTEM) data were acquired on the Rainbow Reservoir during November 2018. During the survey, approximately 12 line-kilometers were collected in the Rainbow Reservoir, near Windsor, Connecticut study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, and New England Water Science Center. FloaTEM data acquir
Floating transient electromagnetic (FloaTEM) surveys in the Delaware River near Barryville, New York
Floating transient electromagnetic (FloaTEM) data were acquired on the Upper Delaware River during December 2018. During the survey, approximately 10 line-kilometers were collected in the Upper Delaware River, near USGS boring 12008-14 (https://webapps.usgs.gov/GeoLogLocator/#!/search) near Barryville, New York study area. Data...
Hawaii Volcanoes National Park stable isotope values from Hawaii forest birds 2012
Blood and feathers were collected from Hawaii forest birds (Apapane and Hawaii Amakihi) in high elevation forest to assess evidence for altitudinal movement. Feathers, red blood cells and plasma were analyzed for hydrogen, carbon, and nitrogen stable isotope ratios, and these were used to infer changes in elevation and diet over time. For each species, at one of 3 sites, isotope v
Floating transient electromagnetic (FloaTEM) surveys in the Eel River near Falmouth, Massachusetts
Floating transient electromagnetic (FloaTEM) data were acquired on the Eel River during November 2018. During the survey, approximately 1.6 line-kilometers were collected in the Eel River, Falmouth, Massachusetts study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, and New England Water Science Center. FloaTEM data acquired along the Eel
NOT YET READY... Airborne electromagnetic (AEM) surveys from the Tallahatchie River near Shellmound, Mississippi
Airborne frequency domain electromagnetic (AEM) data were acquired in a grid pattern consisting of many west-east oriented survey lines over the Tallahatchie River during November 2018. Data were collected by members of the U.S. Geological Survey, Crustal Geophysics and Geochemistry Science Center Group, and CGG. AEM data acquired in Leflore County, Mississippi, were collected to char
Towed transient electromagnetic (tTEM) surveys adjacent to the Tallahatchie River near Shellmound, Mississippi
Towed transient electromagnetic (tTEM) data were acquired adjacent to the Tallahatchie River during March 2018. During the survey, approximately 35 line-kilometers were collected in the Shellmound, Mississippi study area. Data were collected by members of the U.S. Geological Survey, Hydrogeophysics Branch, and the Aarhus University HydroGeophysics Group. FloaTEM data acquired near the