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Maps on sheet 9 show the thickness and the depth to base of uppermost Pleistocene and Holocene (post-LGM) deposits, both for the Offshore of San Gregorio map area and, to establish regional context, for a larger area (about 91 km of coast) that extends from the Bolinas area to the Pescadero Point area. To make these maps, water bottom and depth to base of the LGM horizons were mapped from seismic-reflection profiles using Seisworks software. The difference between the two horizons was exported from Seisworks for every shot point as XY coordinates (UTM zone 10) and two-way travel time (TWT). The thickness of the post-LGM unit was determined by applying a sound velocity of 1,600 m/sec to the TWT, resulting in thicknesses...
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In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly detailed seafloor maps through collection, integration, interpretation, and visualization of swath sonar data, acoustic backscatter, seafloor video, seafloor photography, high-resolution seismic-reflection profiles, and bottom-sediment sampling data. The map products display seafloor morphology and character, identify potential marine benthic habitats, and illustrate both the surficial seafloor...
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In February 2016 the University of Washington in cooperation with the U.S. Geological Survey, Pacific Coastal and Marine Science Center (USGS, PCMSC) collected multibeam bathymetry and acoustic backscatter data in the Catalina Basin aboard the University of Washington's Research Vessel Thomas G. Thompson. Data was collected using a Kongsberg EM300 multibeam echosounder hull-mounted to the 274-foot R/V Thomas G. Thompson. The USGS, PCMSC processed these data and produced a series of bathymetric surfaces and acoustic backscatter images for scientific research purposes. A 25-m bathymetric surface produced from this work was merged with publically available multibeam bathymetry data as well as 2015, 2016, and 2017 multibeam...
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Geophysical and geological survey data were collected off Town Neck Beach in Sandwich, Massachusetts, in May and July 2016. Approximately 130 linear kilometers of subbottom (seismic-reflection) and 234-kilohertz interferometric sonar (bathymetric and backscatter) data were collected along with sediment samples, sea floor photographs, and (or) video at 26 sites within the geophysical survey area. Sediment grab samples were collected at 19 of the 26 sampling sites and video and (or) photographic imagery of the sea floor were taken at all 26 sites. These survey data are used to characterize the sea floor by identifying sediment-texture, seabed morphology, and underlying geologic structure and stratigraphy. Data collected...
Categories: Data; Tags: Atlantic Ocean, CMGP, Cape Cod, Cape Cod Bay, Coastal and Marine Geology Program, All tags...
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The map area offshore of Pacifica, California, which is referred to herein as the “Offshore of Pacifica” map area, is located in northern California, on the Pacific coast of the San Francisco Peninsula about 10 kilometers south of the Golden Gate. The onshore part of the map area extends from Daly City (population about 101,000) on the north, through Pacifica (population about 37,000), to the small coastal community of Montara (population about 2,900) on the south. Much of the coastal zone is managed by either the State of California or local governments, including the coastal recreational sites at Thornton Beach State Park, Mussel Rock Park, Pacifica State Beach, Gray Whale Cove State Beach, and Montara State Beach....
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The map area offshore of Fort Ross, California, which is referred to herein as the “Offshore of Fort Ross” map area is located on California’s north coast, about 90 km north of San Francisco and 60 km south of Point Arena. The onshore part of the map area is largely undeveloped, used primarily for grazing and recreation; the small town of Jenner (population of 136, 2010 census), located at the mouth of the Russian River, is the largest community center. The coast and shoreline are rugged and scenic, characterized by rocky promontories, kelp-rich coves, and nearshore rocks and sea stacks. U.S. Highway 1 extends along the coast through the map area, crossing the Russian River and passing through Fort Ross State Historic...
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Geophysical and geological survey data were collected off Town Neck Beach in Sandwich, Massachusetts, in May and July 2016. Approximately 130 linear kilometers of subbottom (seismic-reflection) and 234-kilohertz interferometric sonar (bathymetric and backscatter) data were collected along with sediment samples, sea floor photographs, and (or) video at 26 sites within the geophysical survey area. Sediment grab samples were collected at 19 of the 26 sampling sites and video and (or) photographic imagery of the sea floor were taken at all 26 sites. These survey data are used to characterize the sea floor by identifying sediment-texture, seabed morphology, and underlying geologic structure and stratigraphy. Data collected...
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The Offshore of Point Reyes map area occupies the western corner of the triangular Point Reyes Peninsula and is about 30 km north of Bolinas and 50 km south of Fort Ross. The offshore portion of the map area is located within the Gulf of the Farallones National Marine Sanctuary. The onshore part of the map area is largely undeveloped, used primarily for recreation and ranching, as well as oyster farming in Drakes Estero. The Point Reyes Peninsula is part of the Point Reyes National Seashore. The coast and shoreline are scenic and diverse, ranging from rolling hills and secluded sandy beaches surrounding Drakes Bay and Drakes Estero, to the steep rocky granitic promontories at Point Reyes headland, to the long, exposed...
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Bathymetric data derived from two multipectral IKONOS satellite images are mosaiced to provide near complete coverage of nearshore terrain around the islands. Bathymetry values shallower than 25 m were derived by gauging the relative attenuation of blue and green spectral radiance as a function of depth. A multiple linear regression analysis of linearized blue and green band spectral values against depth determined the variables of y-intercept, blue slope and green slope values. Variables then used in multivariate slope intercept formula to derive depth. Variables were adjusted to improve the statistical accuracy and spatial coverage of the final derived bathymetry product. Digital image processing to derive depths...
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The map area offshore of Bodega Head, California, which is referred to herein as the “Offshore of Bodega Head” map area is located in northern California, about 80 km north of San Francisco and about 90 km south of Point Arena. The onshore part of the map area is largely undeveloped, used primarily for recreation, farms and ranches, and a few wineries. The small town of Bodega Bay (population 1,077; 2010 census), located on the eastern side of Bodega Harbor, is the largest cultural center. The smaller town of Bodega (population 220) lies 8 km east of the coast on the eastern edge of the map area. Bodega Harbor is an important commercial fishing base and, in season, an active sport fishing and recreation harbor....
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Gridded multibeam bathymetry is integrated with bathymetry derived from multispectral IKONOS satellite data. Gridded (5 m cell size) multibeam bathymetry collected aboard NOAA Ship Hiialaka'i and R/V AHI. Bathymetry values shallower than 25 m were derived by gauging the relative attenuation of blue and green spectral radiance as a function of depth. A multiple linear regression analysis of linearized blue and green band spectral values against depth determined the variables of y-intercept, blue slope and green slope values. Variables then used in multivariate slope intercept formula to derive depth. Variables were adjusted to improve the statistical accuracy and spatial coverage of the final derived bathymetry product....
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The map area offshore of Tomales Point, California, which is referred to herein as the “Offshore of Tomales Point” map area, is located in northern California, about 60 km north of San Francisco and 110 km south of Point Arena. The map area includes offshore waters, Tomales Point (the north end of the Point Reyes Peninsula), the northern part of Tomales Bay, and coastal lands east of Tomales Bay. The onshore part of the map area is largely undeveloped, used primarily for recreation and ranching, as well as oyster farming in Tomales Bay. The Point Reyes Peninsula is part of the Point Reyes National Seashore, and two small areas on the east coast of Tomales Bay are part of the Golden Gate National Recreation Area....
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In February 2016 the University of Washington in cooperation with the U.S. Geological Survey, Pacific Coastal and Marine Science Center (USGS, PCMSC) collected multibeam bathymetry and acoustic backscatter data in Catalina Basin aboard the University of Washington's Research Vessel Thomas G. Thompson. Data was collected using a Kongsberg EM300 multibeam echosounder hull-mounted to the 274-foot R/V Thomas G. Thompson. The USGS, PCMSC processed these data and produced a series of bathymetric surfaces and acoustic-backscatter images for scientific research purposes. This data release page provides a 10-m resolution acoustic-backscatter image as well as FGDC metadata describing these data.
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Geophysical and geological survey data were collected off Town Neck Beach in Sandwich, Massachusetts, in May and July 2016. Approximately 130 linear kilometers of subbottom (seismic-reflection) and 234-kilohertz interferometric sonar (bathymetric and backscatter) data were collected along with sediment samples, sea floor photographs, and (or) video at 26 sites within the geophysical survey area. Sediment grab samples were collected at 19 of the 26 sampling sites and video and (or) photographic imagery of the sea floor were taken at all 26 sites. These survey data are used to characterize the sea floor by identifying sediment-texture, seabed morphology, and underlying geologic structure and stratigraphy. Data collected...
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The Drakes Bay and Vicinity map area occupies the southeastern corner of the triangular Point Reyes Peninsula and is about 30 km north of Bolinas and 50 km south of Fort Ross. The onshore part of the map area is largely undeveloped, used primarily for grazing and recreation as part of the Point Reyes National Seashore. The Point Reyes Peninsula lies completely west of the San Andreas Fault and is bounded by steep terrain along Inverness Ridge on its northeast edge and Point Reyes headland on its southwest margin. The landscape in between includes the Drakes and Limantour Esteros (estuaries), the sandy beaches of Drakes Bay, and the long wind-swept Point Reyes Beach that is backed by an extensive dune field. The...
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The map area offshore of Aptos, California, which is referred to herein as the “Offshore of Aptos” map area, is located on the Pacific Coast, on the north side of Monterey Bay, 88 kilometers (55 miles) south of San Francisco. The largest incorporated city in the map area, Capitola (and numerous unincorporated towns including Aptos) lie on uplifted marine terraces between the shore and the northern-trending Santa Cruz Mountains, part of the northwest trending Coast Ranges that run roughly parallel to the San Andreas Fault Zone (SAFZ) (California Geological Survey, 2002). As of 2013 the U.S. Census Bureau estimated populations of Aptos and Capitola were approximately 6000 and 10,000 respectively. Aptos is one of the...
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The map area offshore of Salt Point, California, which is referred to herein as the “Offshore of Salt Point” map area, is located in northern California, about 110 km north of San Francisco and 50 km south of Point Arena. The map area includes three California Marine Protected Areas (MPA; California Department of Fish and Wildlife, 2012): the southern portion of the Stewarts Point State Marine Reserve, the Salt Point State Marine Conservation Area, and the Gerstle Cove State Marine Reserve. The coast and shoreline are rugged and scenic, characterized by rocky promontories, steep bluffs capped by bare to forested marine terraces, kelp-rich coves, and nearshore rocks and pinnacles. The largely undeveloped onshore...
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This dataset displays the possible error in the bathymetry measurements, in meters, around Ofu and Olosega Islands. It is calculated as (Sonar depth - satellite imagery derived depth). The spatial extent is the area of overlap between the two measurement types. {Abstract from "Shelf Bathymetry, Ofu and Olosega Islands (American Samoa)" dataset} Gridded multibeam bathymetry is integrated with bathymetry derived from multpectral IKONOS satellite data. Gridded (5 m cell size) multibeam bathymetry collected aboard NOAA Ship Hiialaka'i and R/V AHI. Bathymetry values shallower than 25 m were derived by gauging the relative attenuation of blue and green spectral radiance as a function of depth. A multiple linear regression...


map background search result map search result map Error in bathymetry measurements (in meters), Ofu and Olosega Islands, American Samoa Shelf Bathymetry (depth in meters), Ofu and Olosega Islands, American Samoa Nearshore Bathymetry (depth in meters), Ofu and Olosega Islands, American Samoa Offshore Pacifica Web Services Drakes Bay and Vicinity Web Services Offshore Point Reyes Web Services Offshore Tomales Point Web Services Offshore Bodega Head Web Services Offshore Fort Ross Web Services Offshore Salt Point Web Services Bolinas to Pescadero Region Web Services Offshore Scott Creek Web Services Offshore Aptos Web Services Multibeam acoustic-backscatter data collected in 2016 in Catalina Basin, Southern California Merged multibeam bathymetry--northern portion of the Southern California Continental Borderland Backscatter imagery collected in 2016 by the U.S. Geological Survey off Town Neck Beach Sandwich, Massachusetts during field activity 2016-017-FA (GeoTIFF image) Grain-size analysis of sediment samples collected in July 2016 by the U.S. Geological Survey off Town Neck Beach, Sandwich in Massachusetts, during field activity 2016-037-FA (CSV file and simplified shapefile) Location of bottom photographs along with images collected in July 2016 by the U.S. Geological Survey off Town Neck Beach, Sandwich, Massachusetts, during field activity 2016-037-FA (JPEG images, point shapefile, and CSV file) Grain-size analysis of sediment samples collected in July 2016 by the U.S. Geological Survey off Town Neck Beach, Sandwich in Massachusetts, during field activity 2016-037-FA (CSV file and simplified shapefile) Location of bottom photographs along with images collected in July 2016 by the U.S. Geological Survey off Town Neck Beach, Sandwich, Massachusetts, during field activity 2016-037-FA (JPEG images, point shapefile, and CSV file) Backscatter imagery collected in 2016 by the U.S. Geological Survey off Town Neck Beach Sandwich, Massachusetts during field activity 2016-017-FA (GeoTIFF image) Error in bathymetry measurements (in meters), Ofu and Olosega Islands, American Samoa Nearshore Bathymetry (depth in meters), Ofu and Olosega Islands, American Samoa Shelf Bathymetry (depth in meters), Ofu and Olosega Islands, American Samoa Offshore Point Reyes Web Services Offshore Tomales Point Web Services Offshore Bodega Head Web Services Drakes Bay and Vicinity Web Services Offshore Fort Ross Web Services Offshore Scott Creek Web Services Offshore Pacifica Web Services Offshore Salt Point Web Services Offshore Aptos Web Services Bolinas to Pescadero Region Web Services Multibeam acoustic-backscatter data collected in 2016 in Catalina Basin, Southern California Merged multibeam bathymetry--northern portion of the Southern California Continental Borderland