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The HydroLink Tool aids in generating a linear reference for point data to the NHDPlusV2.1 Medium Resolution and NHD High Resolution hydrography layers. The tool employs the researcher’s local, field-based knowledge of the geospatial features where data were collected to improve both the spatial accuracy of the research data and assist in the linkage to these national surface water datasets. Once the point location data are verified and linear referencing is complete, the output dataset includes the verified latitude and longitude coordinates and additional attributes to document the linkage to the hydrography datasets. The dataset can then be exported as a shapefile (SHP) from the tool, or exported in multiple...
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This data release includes tables and plots of results for pesticide compounds (pesticides and degradates) analyzed in groundwater samples collected by the USGS National Water-Quality Assessment Project during water years 2013-18 and in associated quality-control samples that are used to assess the quality of the reported pesticide results. All samples were analyzed by the USGS National Water Quality Laboratory (NWQL) using laboratory schedule 2437. The table of groundwater data includes pesticide results as reported by the laboratory, along with results that represent the application of censoring levels at the 90-percent upper confidence limit of the 95th percentile of laboratory blank concentrations determined...
Placeholder for supplemented High Resolution Orthoimagery that fills gaps in NAIP coverage.
The National Geospatial Program collection of resources provide service interfaces to the basemap services from The National Map and the services provided by ScienceBase for NGP Staged Products (US Topo, etc.).
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    map background search result map search result map NAIP Plus High Resolution Orthoimagery NAIP Plus High Resolution Orthoimagery - Hawaii NAIP Plus High Resolution Orthoimagery - Guam NAIP Plus High Resolution Orthoimagery - Puerto Rico NAIP Plus High Resolution Orthoimagery - Virgin Islands Field, laboratory, and third-party data for assessment of the quality of pesticide results reported by the National Water Quality Laboratory for groundwater samples collected by the National Water-Quality Assessment Project, 2013-18 NAIP Plus High Resolution Orthoimagery - Guam NAIP Plus High Resolution Orthoimagery - Hawaii Field, laboratory, and third-party data for assessment of the quality of pesticide results reported by the National Water Quality Laboratory for groundwater samples collected by the National Water-Quality Assessment Project, 2013-18 NAIP Plus High Resolution Orthoimagery