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Digital elevation models (DEMs) of the Elwha River delta, Washington, February 2016 This portion of the USGS data release presents digital elevation models (DEMs) derived from bathymetric and topographic surveys conducted on the Elwha River delta in February 2016 (USGS Field Activity Number 2016-608-FA). Nearshore bathymetry data were collected using two personal watercraft (PWCs) and a kayak equipped with single-beam echosounders and survey-grade global navigation satellite systems (GNSS) receivers. Topographic data were collected on foot with survey-grade GNSS receivers mounted on backpacks. Positions of the survey platforms were referenced to a GNSS base station placed on a benchmark with known horizontal and vertical coordinates relative to the North American Datum of 1983 (CORS96 realization)... Types: Citation; Tags: Clallum County, Echo Sounders, Elwha River, GPS (Global Positioning System), Olympic Peninsula, All tags... Strait of Juan de Fuca, Water Depth, bathymetry measurement, digital elevation models, elevation, topography, Fewer tags Nearshore bathymetry data from the Elwha River delta, Washington, February 2016 This portion of the USGS data release presents bathymetry data collected during surveys performed on the Elwha River delta, Washington in February 2016 (USGS Field Activity Number 2016-608-FA). Bathymetry data were collected using two personal watercraft (PWCs) and a kayak, all equipped with single-beam sonar systems and global navigation satellite systems (GNSS) receivers. The PWC sonar systems consisted of an Odom Echotrac CV-100 single-beam echosounder and 200 kHz transducer with a 9° beam angle. Raw acoustic backscatter returns were digitized by the echosounder with a vertical resolution of 1.25 cm. Depths from the echosounders were computed using sound velocity profiles measured using a YSI CastAway CTD during... Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Clallam County, Elwha River, Olympic Peninsula, Strait of Juan de Fuca, bathymetry measurement, All tags... elevation, Fewer tags Topography data from the Elwha River delta, Washington, February 2016 This portion of the USGS data release presents topography data collected during surveys performed on the Elwha River delta, Washington, in February 2016 (USGS Field Activity Number 2016-608-FA). Topography data were collected on foot with global navigation satellite systems (GNSS) equipment mounted on backpacks operating primarily in Real-Time Kinematic (RTK) mode. A total of 5 GNSS backpacks, each equipped with a dual-frequency GNSS receiver and handheld data collector, were used during the survey. Differential corrections were transmitted at 1-Hz intervals by a VHF radio to the backpack GNSS receivers from a GNSS base station placed on a benchmark with known horizontal and vertical coordinates relative to the... Types: Citation, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Clallam County, Elwha River, GPS measurement, Olympic Peninsula, Strait of Juan de Fuca, All tags... elevation, Fewer tags