• Organization: Department of the Interior
• Updated: 2023-11-30T00:00:00Z

The National Land Cover Database (NLCD) is a land cover monitoring program providing land cover information for the United States. NLCD2016 extended temporal coverage to 15 years (2001–2016). We...

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• Organization: Department of the Interior
• Updated: 2020-08-31T00:00:00Z

Data were obtained in order to evaluate differences among watersheds that vary in stormwater management practice arrangement by assessing differences in baseflow nutrient fluxes and stormflow...

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• xml

• Organization: Department of the Interior
• Updated: 2023-11-02T00:00:00Z

From October 2017 through September 2022, the National Water Quality Network (NWQN) monitored 110 surface-water river and stream sites and more than 1,800 groundwater wells for a large number of...

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• Organization: Department of the Interior
• Updated: 2023-02-06T00:00:00Z

This dataset contains bulk chemical data for fly ash samples from the Atkinson Heat and Power Plant in Fairbanks, AK and National Institute for Standards and Technology (NIST) Standard Reference...

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• Organization: Department of the Interior
• Updated: 2024-11-18T00:00:00Z

This preliminary product contains annual land cover, land use, and change process variables for reference data plots in a .csv table. The same information available in the.csv file is also...

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• Organization: National Institute of Standards and Technology
• Updated: 2015-08-27 00:00:00

SRM 3252 Protein Drink Mix - This Standard Reference Material (SRM) is intended primarily for validation of methods for determining proximates, fatty acids, cholesterol, vitamins, elements, and...

• Organization: U.S. Environmental Protection Agency
• Updated: 2024-12-12

Three PurpleAir sensors were collocated with a T640x reference monitor at the Durango Complex Air Quality Monitoring Station in Phoenix, Arizona in May 2019. Both instruments measured PM2.5 and...

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• Organization: Department of the Interior
• Updated: 2023-01-01T00:00:00Z

Archive of GIS Data from the USFWS NWRS R8 Wetland Habitat Assessment Protocol implementation. This includes field data with basic quality assurance / quality control and survey unit reference...

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• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2025-11-05T00:00:00.000+00:00

This record describes water quality human dietary tracer concentration metrics collected monthly between May 2023 to May 2024 to provide reference data of nearshore water quality on the island of...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2017-03-09

The Reference data represents reference monitoring data associated with EPA-operated air monitoring equipment located at its AIRS test site in the Research Triangle Park, NC campus. The UN sensor...

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• Organization: U.S. Environmental Protection Agency
• Updated: 2021-11-13

Air quality modeling for China. This dataset is not publicly accessible because: Data was generated and owned by Tsinghua University. It can be accessed through the following means: Data can be...

• Organization: National Institute of Standards and Technology
• Updated: 2015-09-04 00:00:00

Standard Reference Material 909c Frozen Human Serum - This Standard Reference Material (SRM) is intended primarily for use in validating analytical methods for the determination of specified...

• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2025-11-04T00:00:00.000+00:00

This record describes water quality inorganic nutrient concentration metrics collected monthly between May 2023 to May 2024 to provide reference data of nearshore and watershed water quality on...

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• +6 more

• Organization: National Institute of Standards and Technology
• Updated: 2015-08-27 00:00:00

SRM 3532 Calcium-Containing Solid Oral Dosage Form - This Standard Reference Material (SRM) is intended primarily for validation of methods for determining cholecalciferol (vitamin D3) and...

• Organization: National Oceanic and Atmospheric Administration, Department of Commerce
• Updated: 2025-04-21T00:00:00.000+00:00

This dataset contains MatLab files for a Toolbox for secondary quality control (2nd QC) on ocean chemistry and hydrographic data. High quality, reference measurements of chemical and physical...

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• Organization: Department of the Interior
• Updated: 2025-04-15T00:00:00Z

This dataset consists of a snapshot in time of the discrete water quality data collected in the coastal lagoons of northwestern Alaska. This data release consists of one file, 2025-04-15 ARCN...

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• Organization: Department of the Interior
• Updated: 2020-08-20T00:00:00Z

The RVCAT database contains data that have been collected on various vessel operations on the Great Lakes and select connecting waterways. This section of Reference Tables specifically handles...

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• Organization: National Institute of Standards and Technology
• Updated: 2015-08-27 00:00:00

SRM 3235 Soy Milk - This Standard Reference Material (SRM) is intended primarily for validation of methods for determining vitamins, elements, proximates, fatty acids, and amino acids in soy milk...

• Organization: Department of the Interior
• Updated: 2020-08-21T00:00:00Z

Trends in nutrient fluxes and streamflow for selected tributaries in the Lake Erie watershed were calculated using monitoring data at 10 locations. Trends in flow-normalized nutrient fluxes were...

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• Organization: Department of the Interior
• Updated: 2025-04-11T00:00:00Z

This data release consists of one file, ARCN Lagoons 2016 Continuous Water Quality Data (Ver. 2025-04-11).csv, containing continuous water quality data 2016 for the coastal lagoons of Alaska. Data...

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