Identification_Information: Citation: Citation_Information: Originator: Stevens, A.W., Lacy, J.R., Finlayson, D.P., and Gelfenbaum, G. Publication_Date: 2008 Title: Evaluation of a single-beam sonar system to map seagrass at two sites in northern Puget Sound Geospatial_Data_Presentation_Form: tabular digital data Larger_Work_Citation: Citation_Information: Originator: Stevens, A.W., Lacy, J.R., Finlayson, D.P., and Gelfenbaum, G. Publication_Date: 2008 Title: Evaluation of a single-beam sonar system to map seagrass at two sites in northern Puget Sound Series_Information: Series_Name: Scientific Investigations Report Issue_Identification: 2008-5009 Publication_Information: Publication_Place: Menlo Park, CA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/sir/2008/5009/ Description: Abstract: Nearshore bathymetry and seagrass cover at two sites in northern Puget Sound were mapped with single-beam sonar and an underwater video. Acoustic data were compared against underwater video data collected simultaneously to better understand the accuracy, limitations and benefits of mapping seagrass acoustically in Puget Sound. Purpose: The goal of the project was two-fold: 1) To quantify eelgrass (Z. marina) habitat at two sites, Possession Point and Browns Bay, in northern Puget Sound and 2) Evaluate the benefits and limitations of using acoustics, specifically single-beam sonar, to map seagrass in Puget Sound. Supplemental_Information: To map seagrass at two sites in northern Puget Sound, a dual-frequency Biosonics sonar operating at 200 and 430 kHz was used to map seafloor depth, morphology and vegetation. An underwater video camera was deployed to ground-truth acoustic data. Fifty one sediment samples were collected to quantify sediment grain size distributions across Possession Point. Sediment samples were analyzed for grain size at the Western Coastal and Marine Geology Team sediment laboratory in Menlo Park, CA. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20070130 Ending_Date: 20070202 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -123.17290 East_Bounding_Coordinate: -123.13793 North_Bounding_Coordinate: 48.60642 South_Bounding_Coordinate: 48.58775 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: bathymetry Theme_Keyword: seagrass Theme_Keyword: sediment Theme_Keyword: oceans and estuaries Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificinformation Theme_Keyword: location Theme_Keyword: oceans Theme_Keyword: inlandWaters Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: Global Change Master Directory (GCMD) Theme_Keyword: Earth Science > Oceans > Bathymetry/Seafloor Topography Theme_Keyword: Earth Science > Oceans > Coastal Processes Theme_Keyword: Earth Science > Oceans > Marine Sediments Theme_Keyword: Instruments > Grab Samplers Place: Place_Keyword_Thesaurus: General Place_Keyword: WA Place_Keyword: USA Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Possession Point Place_Keyword: Browns Bay Place_Keyword: Puget Sound Place_Keyword: Washington Access_Constraints: None Use_Constraints: Public domain data from the U.S. government is freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Andrew Stevens Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield R. MS999 City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5243 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: astevens@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://walrus.wr.usgs.gov/infobank/b/b207ps/html/b-2-07-ps.meta.html Browse_Graphic_File_Description: Index map of field activity B-2-07-PS. Browse_Graphic_File_Type: GIF Cross_Reference: Citation_Information: Originator: U.S. Geological Survey, Coastal and Marine Geology Program Publication_Date: 2007 Title: InfoBank Online_Linkage: http://walrus.wr.usgs.gov/infobank/b/b207ps/html/b-2-07-ps.meta.html Data_Quality_Information: Logical_Consistency_Report: A) Bathymetric mapping Completeness_Report: A) Bathymetric mapping Sixty (60) kilometers of acoustic bathymetry/substrate data were collected with a dual-frequency (200 and 430 kHz) Biosonics system along 163 transects in Possession Point between 1/30/07 and 2/1/07. Eighteen(18) kilometers of acoustic bathymetry/substrate data were collected with the same system along 65 transects in Browns Bay on 2/2/2007. The Biosonics sonar generates a 6-degree cone of sound, which translates into a footprint on the seafloor ranging 0.55 to 55 m^2 area for the water depths surveyed (2 - 20 m). Ship speed generally ranged 4.0-4.5 kts and data were merged with GPS positions at 1 Hz. Track lines were spaced 25 - 50 m apart. B) Sediment Samples for Grain Size Analyses Sediment samples were collected using a van veen grab sampler or taken directly during low-tide surveys. In the field, a sub-sample of the uppermost 1-3 cm of each grab was collected and placed into storage bags, labeled, and logged. Samples were disaggregated and sieved through 2000 and 62 micron screens to separate gravel, sands and mud after the organic component was removed by treatment with hydrogen peroxide. Sediment grain size of sands was determined using the settling methods and principles of Stokes Law on the USGS 3-m long settling tubes. The fine fraction (silts and clays) were analyzed on a Coulter 230 Laser Particle Analyzer. Three samples had less than 3% intermediate fraction and were analyzed on the Coulter. Single sample runs were made on the tubes, while results from the laser particle analyzer are averages of triplicates with standard deviations around the mean ranging 18 to 24 microns due to instrument errors. Lineage: Process_Step: Process_Description: A) Bathymetric mapping The combined bathymetric data were merged to create a digital elevation model representing the surface topography of Possession Point and Browns Bay. This surface is referenced to the NAD83 datum in the WA State Plane North, meters projection with a horizontal accuracy of 2.3 cm. Elevations are referenced to NAVD88 with an estimated vertical accuracy ranging 2.6-9.8 cm. This includes error from the RTK-DGPS and Biosonics sonar, and errors introduced in data processing. Process_Date: 2007 Process_Step: Process_Description: B) Sediment Samples for Grain Size Analyses Results from the tubes and laser particle analyzer were merged using standard USGS methods found in the USGS particle analysis program pcSedSize. Process_Date: 2007 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Point Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum of 1983 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North American Vertical Datum of 1988 Altitude_Resolution: 0.1 Altitude_Distance_Units: meters Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Depth_System_Definition: Depth_Datum_Name: local surface Depth_Resolution: 0.1 Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: line[number].xyz Entity_Type_Definition: digital surface elevation data Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: X Attribute_Definition: Location X-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 486997.617 Range_Domain_Maximum: 489962.263 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: Y Attribute_Definition: Location Y-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 5381456.319 Range_Domain_Maximum: 5383932.558 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: Z Attribute_Definition: Location Z-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -10.00 Range_Domain_Maximum: 0.00 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Detailed_Description: Entity_Type: Entity_Type_Label: sediment grain size data Entity_Type_Definition: surface elevation data Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: Lon Attribute_Definition: Location X-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -123.58611 Range_Domain_Maximum: -123.13611 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: Lat Attribute_Definition: Location Y-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48.58611 Range_Domain_Maximum: 48.60833 Attribute_Units_of_Measure: decimal degrees Attribute_Measurement_Resolution: 0.00001 Attribute: Attribute_Label: Depth_m Attribute_Definition: Location Z-coordinate of the data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 10.00 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Overview_Description: Entity_and_Attribute_Overview: >Sample of digital surface elevation data XYZ ASCII file, bathy/line95.xyz: >X Y Z >487989.879521 5381998.198351 -3.31 >487990.116289 5381998.892258 -3.34 >487989.943243 5382001.029467 -3.40 > >Sample of sediment sampling log: >Station Local_Time UTC Lon Lat Depth_m Comment >1 6/1/07 20:44 6/2/07 3:44 -123.1430877 48.60642247 2.286 - >2 6/1/07 20:35 6/2/07 3:35 -123.1416559 48.60596625 2.1336 18.6 C >3 6/1/07 20:28 6/2/07 3:28 -123.1396819 48.60476647 2.4384 22.4 C Entity_and_Attribute_Detail_Citation: none Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology Contact_Person: Andrew Stevens Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. MS999 City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5243 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: astevens@usgs.gov Distribution_Liability: Although this data set has been used by the USGS, no warranty, expressed or implied, is made by the USGS as to the accuracy of the data and/or related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS in the use of these data or related materials. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Metadata_Reference_Information: Metadata_Date: 20080212 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Coastal and Marine Geology Contact_Person: Andrew Stevens Contact_Position: Oceanographer Contact_Address: Address_Type: mailing and physical address Address: 345 Middlefield Rd. MS999 City: Menlo Park State_or_Province: CA Postal_Code: 94025-3561 Country: USA Contact_Voice_Telephone: (650) 329-5243 Contact_Facsimile_Telephone: (650) 329-5190 Contact_Electronic_Mail_Address: astevens@usgs.gov Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998