{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Martin A. Briggs", "hasEmail": "mailto:mbriggs@usgs.gov"}, "description": "The University of Connecticut and the U.S. Geological Survey (USGS) collected low-altitude (30-50 m above ground level) airborne visible-light imagery data via a quadcopter, small unoccupied aircraft system (UAS or \u2018drone\u2019) deployed along two tributary confluence locations within the Housatonic River: Mill Brook (latitude: 42\u00b052\u201918\u201d N, longitude: 73\u00b021\u201948\u201d W) and Furnace Brook (latitude: 41\u00b049\u201916\u201d N, longitude: 73\u00b022\u201917\u201d W). Both tributary confluence sites serve as critical summer thermal refuge for cold water-adapted poikilotherms. The objectives for this data collection included the creation of high-resolution orthomosaic images of the two tributary confluences to \ninfer bank and instream structures and mixing processes at the tributary confluences. Detailed site-scale maps such as these are important tools for managers and researchers aiming to protect and conserve populations at risk. The UAS (Mavic 2 Zoom, DJI Enterprises) was flown several times per day, at wind speeds below 10 mph, capturing RGB imagery from March 24-25, 2021. The UAV flights collected single RGB JPG images at 30-50m above ground level using the double-grid flight pattern on the third-party app Pix4D Capture (https://www.pix4d.com/product/pix4dcapture). The images were stitched automatically into several orthomosaic images using Agisoft Metashape (Agisoft LLC, St. Petersburg, Russia) \nsoftware as described in the \u2018processed_data\u2019 subfolders of this data release. Structure from Motion techniques were also applied to the visual imagery to derive time-specific, digital surface models (DSM) of the exposed banks and some subsurface features.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9B3TLNL", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.60772608d34e018b32041fbe.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_60772608d34e018b32041fbe", "keyword": ["Connecticut", "Groundwater", "Housatonic River Watershed", "Litchfield County", "Surface Water", "UAS", "USGS:60772608d34e018b32041fbe", "aerial photography", "drone", "environment", "geophysics", "geoscientificInformation", "groundwater and surface-water interaction", "hydrogeology", "hydrology", "image collections", "inlandWaters", "remote sensing", "surface water (non-marine)", "unmanned aircraft system", "unoccupied aircraft system", "water temperature"], "modified": "2021-04-30T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-73.3761, 41.8184, -73.3597, 41.8739", "theme": ["geospatial"], "title": "Visible-light orthomosaic images collected by drone for two cold-water tributary confluences within the Housatonic River, CT, USA"}