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The Gap Analysis Project (GAP) is an element of the U.S. Geological Survey. GAP helps to implement the Department of the Interior’s goals of inventory, monitoring, research, and information transfer. GAP has three primary goals: Identify conservation gaps that help keep common species common; Provide conservation information to the public so that informed resource management decisions can be made; and Facilitate the application of GAP data and analysis to specific resource management activities. To implement these goals, GAP carries out the following objectives: Map the land cover of the United States Map predicted distributions of vertebrate species for the U.S. Map the location, ownership and stewardship of...
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Note: This data release is currently under revision and is temporarily unavailable. Phenological dynamics of terrestrial ecosystems reflect the response of the Earth's vegetation canopy to changes in climate and hydrology and are thus important to monitor operationally. The Exotic Annual Grass (EAG) phenology in the western U.S. rangeland based on 30m near seamless Harmonized Landsat and Sentinel-2 (HLS) Normalized Difference Vegetation Index (NDVI) weekly composites between 2016 and 2021 (Dahal et al., 2022) were processed using these 3 methods: (1) NDVI threshold-based method, (2) manual phenological metrics, and (3) modeling and mapping. The EAG phenology model produced eight metrics identifying the sustainable...
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The USGS and Virginia Tech are determining if and how the implementation of conservation practices, such as best management practices (BMPs), in watersheds have improved the health of Chesapeake nontidal streams. Our goal is to identify the effects of BMPs and land-use on stream ecosystems by linking upstream landscape change to stream physical habitat, water quality, flow and temperature, and macroinvertebrate and fish responses. We are also determining the specific sources of stress to streams and fish populations to help identify which management practices are most likely to improve stream health. Each year from 2021 to 2024 we study a different Chesapeake landscape setting that is a focus area for stakeholders...
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This data release provides a monthly irrigation water use reanalysis for the period 2000-20 for all USGS Watershed Boundary Dataset of Subwatersheds (HUC12) in the conterminous United States (CONUS). Results include reference evapotranspiration (ETo), actual evapotranspiration (ETa), irrigated areas, consumptive use, and effective precipitation for each HUC12. ETo and ETa were estimated using the operational Simplified Surface Energy Balance (SSEBop, Senay and others, 2013; Senay and others, 2020) model executed in the OpenET (Melton and others, 2021) web-based application implemented in Google Earth Engine. Results provided by OpenET/SSEBop were summarized to hydrologic response units (HRUs) in the National Hydrologic...
The Ecological Flows (Ecoflows) Program within the Water Mission Area (WMA) provides the data and science needed to develop and quantify relations between water availability and biological responses through improving the WMA’s ability to predict key ecological outcomes of human activities on the landscape. Program sub-objectives include: developing a comprehensive understanding of the interactions among aquatic ecosystems, hydrology, and hydrochemistry, developing and applying models to predict potential effects of changes in population, land use, climate, and management practices upon future water availability, and predicting the availability of impaired water resources and the effects of using these water sources...
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This is the USGS California Water Science Center's Catalog and Repository space. This space primarily supports CAWSC science projects by providing a place to organize and publicly release data which cannot fit within the USGS's National Water Information System. The CAWSC mission is to collect, analyze and disseminate impartial hydrologic data and information needed to wisely manage water resources for the people of the United States and the State of California. CAWSC Web site: http://ca.water.usgs.gov/
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In recent years, the USGS and partners have been integral in monitoring, analyzing, and modeling streamflow permanence. This community of practice includes key USGS scientists and partners who have been involved in the establishment and advancement of that science. The primary objective of this community is to provide an organized platform to document the activity and resources related to streamflow permanence. Additionally, we aim to facilitate more efficient collaboration among internal and external streamflow permanence experts.
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Welcome to the U.S. Geological Survey (USGS) Alaska Science Center (ASC), headquartered in Anchorage, Alaska. At the ASC, all of the USGS Mission Area Programs are managed collectively with a vision to achieving an integrated landscape level understanding of the highly diverse and complex Alaskan and Arctic Ecosystems. The mission of the Alaska Science Center is to provide objective and timely data, information, and research findings about the earth and its flora and fauna to Federal, State, and local resource managers and the public to support sound decisions regarding natural resources, natural hazards, and ecosystems in Alaska and circumpolar regions.


    map background search result map search result map USGS Gap Analysis Project (GAP) USGS Alaska Science Center - Data Release Backup USGS California Water Science Center Chesapeake​ Stream Team Irrigation water use reanalysis for the 2000-20 period by HUC12, month, and year for the conterminous United States Exotic annual grass (EAG) phenology estimates in the western U.S. rangelands based on 30-m HLS NDVI: 2017 - 2021 Chesapeake​ Stream Team USGS California Water Science Center Exotic annual grass (EAG) phenology estimates in the western U.S. rangelands based on 30-m HLS NDVI: 2017 - 2021 USGS Alaska Science Center - Data Release Backup Irrigation water use reanalysis for the 2000-20 period by HUC12, month, and year for the conterminous United States USGS Gap Analysis Project (GAP)