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Potential contaminant sources and other landscape variables summarized for NHDPlus Version 2.1 catchments within the Chesapeake Bay Watershed (ver. 2.0, June 2021) This dataset consists of 262 variables which describe various known and suspected point and non-point sources of contaminants and endocrine disrupting compounds (EDCs) throughout the Chesapeake Bay Watershed. Contaminant data was summarized to the NHDPlus Version 2.1 catchment level (1:100K). Contaminant data summarized span a time range of 2001 to 2016 and include regulated facilities, pesticides, manure and biosolids application data, mercury deposition, animal feeding applications, septic systems, landfills, and land use and land cover. These data are presented in a comma separated file, which includes all variables summarized and the NHDPlus Version 2.1 FEATUREID field (also known as COMID). The FEATUREID field... Categories: Data, Data Release - Revised; Types: Citation; Tags: Aquatic Biology, Chesapeake Bay, Chesapeake Bay Basin, Delaware, Discharge Monitoring Report (DMR), All tags... District of Columbia, Environmental Health, Facility Registry Service (FRS), Geography, Land Use Change, Maryland, New York, Pennsylvania, Remote Sensing, Toxic Release Inventory (TRI), USGS Science Data Catalog (SDC), Virginia, Water Quality, Water Resources, West Virginia, Wildlife Biology, Wildlife Disease, biosolids application, concentrated animal feeding operations (CAFOs), contamination and pollution, geographic information systems, geography, health and disease, human impacts, industrial pollution, land use and land cover, landfills, manure nitrogen and phosphorus, mercury deposition, natural resources, nonpoint-source pollution, pesticide and herbicide contamination, pharmaceutical contamination, phytoestrogens, septic facilities, water quality, water resources, Fewer tags Hyperspectral Characterization of Common Cyanobacteria Associated with Harmful Algal Blooms (ver. 2.0, October 2020) This dataset is a collection of hyperspectral imagery profiles of 13 common algae associated with Harmful Algae Blooms (HAB). Data were retrieved from a hyperspectral microscope at, and with the cooperation of, the National Institute of Standards and Technology. Samples were collected from USGS water quality sampling efforts, and were also purchased from commercial vendors of biological materials. Data are shown in basic hyperspectral imagery form, transformed into the first derivative and corrected with a flat field algorithm to account for variations in locale lighting conditions. First posted - January 6, 2020 (available from author) Revised - October 30, 2020 (version 2.0) Categories: Data, Data Release - Revised; Tags: Aquatic Biology, Botany, Geography, Harmful Algal Blooms, Remote Sensing, All tags... USGS Science Data Catalog (SDC), Water Resources, biota, cyanobacteria, hyperspectral remote sensing, imaging spectroscopy, Fewer tags Ephemeral channel heads and digital elevation models used to extract stream networks in Clarksburg, MD (ver. 2.0, October 2021) This dataset describes the location of channel heads survyed in two headwater watersheds in Clarksburg, Montgomery County, Maryland, and the digital elevation models derived from light detection and ranging (lidar) covering the two watersheds. The digital elevation models were used to derive topographic attributes used to delineate drainage networks that were then assessed for accuracy using the field-surveyed channel heads. First posted - January 21, 2021 (available from author) Revised - October 15, 2021 (version 2.0) Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Maryland, USGS Science Data Catalog (SDC), drainage basins, land surveying, river systems, All tags... streams, Fewer tags