Metadata: Identification_Information: Citation: Citation_Information: Originator: Brian D. Andrews Publication_Date: 2006 Title: Nahant to Gloucester, high-resolution seismic-reflection profiles Edition: 1.0 Geospatial_Data_Presentation_Form: raster Series_Information: Series_Name: Open File Report Issue_Identification: 2005-1293 Publication_Information: Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: https://doi.org/10.3133/ofr20051293 Online_Linkage: https://pubs.usgs.gov/of/2005/1293/html/appendix1.html Larger_Work_Citation: Citation_Information: Originator: Walter A. Barnhardt Originator: Brian D. Andrews Originator: Bradford Butman Publication_Date: 2006 Title: High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2005-1293 Publication_Information: Publication_Place: Reston, VA Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.3133/ofr20051293 Online_Linkage: https://pubs.usgs.gov/of/2005/1293/ Description: Abstract: This report presents high-resolution maps of the seafloor offshore of Massachusetts, from Nahant to Gloucester. Approximately 134 km² of the inner shelf were mapped with a focus on the nearshore region in water depths less than 40 m. The maps were prepared as part of a cooperative mapping program between the U.S. Geological Survey (USGS) and the Massachusetts Office of Coastal Zone Management (CZM). They are based on marine geophysical data, sediment sampling, and bottom photography obtained on two research cruises carried out in 2003 and 2004. The primary objective of this program is to develop a suite of seafloor maps that provide geologic information for management of coastal and marine resources. Accurate maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine reserves, and assessing environmental changes due to natural or human impacts. The maps also provide a geologic framework for scientific research, industry and the public. Purpose: These seismic-relfection data were used to generate a sediment isopach map, which shows the total thickness of sediment between the seafloor and bedrock Supplemental_Information: The original report did not include a separate metadata file for these data, so the metadata file was created at a later date (2025). Additional information about the activities that acquired the data can be found at: https://cmgds.marine.usgs.gov/services/activity.php?fan=2003-007-FA and https://cmgds.marine.usgs.gov/services/activity.php?fan=2004-002-FA The bounding coordinates are the same as the sidescan sonar mosaic bounding coordinates. The shot point and trackline data are in a personal geodatabase and were inaccessible at the time of the metadata creation. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20030922 Ending_Date: 20040507 Currentness_Reference: ground condition of two separate date ranges - 20030922 to 20031015 and 20040412 to 20040507 Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.942180 East_Bounding_Coordinate: -70.660046 North_Bounding_Coordinate: 42.577803 South_Bounding_Coordinate: 42.388418 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:a0d87e91-5339-473f-800a-190aedda5203 Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Science Center Theme_Keyword: WHSC Theme_Keyword: Seafloor Theme_Keyword: Marine Geology Theme_Keyword: field activity serial number RAFA03007 Theme_Keyword: field activity serial number RAFA04002 Theme_Keyword: Sidescan Theme_Keyword: Sidescan Sonar Theme_Keyword: Edgetech Theme_Keyword: DF-1000 Theme_Keyword: greyscale image Theme_Keyword: GeoTIFF Theme_Keyword: seafloor mapping Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: geoscientificInformation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: image collections Theme_Keyword: marine geology Theme_Keyword: seismic reflection methods Theme_Keyword: marine geophysics Theme_Keyword: sub-bottom profiling Theme_Keyword: geospatial datasets Place: Place_Keyword_Thesaurus: None Place_Keyword: Massachusetts Bay Place_Keyword: Atlantic Ocean Place_Keyword: Salem Sound Place_Keyword: Nahant Place_Keyword: Gloucester Place_Keyword: South Essex Ocean Sanctuary Access_Constraints: No access constraints. Please see 'Distribution Information' for details. Use_Constraints: These data are marked with a Creative Commons CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Please recognize the U.S. Geological Survey (USGS) as the source of this information. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Andrews Contact_Organization: U.S. Geological Survey Contact_Position: Marine Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2348 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: bandrews@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: https://pubs.usgs.gov/of/2005/1293/images/L108_001.jpg Browse_Graphic_File_Description: Example of one of the seismic-relfection profiles images. Browse_Graphic_File_Type: PDF Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722 Data_Quality_Information: Logical_Consistency_Report: Information not available. Completeness_Report: Information not available. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Although the profiles images themselves don't have navigation data, the report indicates navigation for the research vessel and all data collection used Real-Time Kinematic Global Positioning System (RTK-GPS). The RTK corrected GPS signal was sent to the R/V Rafael from a base station established by the USGS that occupied a Defense Mapping Agency geodetic monument near the Eastern Point Lighthouse in Gloucester. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Seismic data are not corrected for tides. Lineage: Process_Step: Process_Description: Approximately 1,175 km of high-resolution seismic-reflection profiles (fig. 3.4) were collected using a Knudsen 320b chirp system (3.5-12 kHz). Data were processed using SIOSEIS (Scripps Institute of Oceanography) and Seismic Unix (Colorado School of Mines) to produce segy files and jpg images of the seismic profiles. The segy data were then imported into SeisWorks (Landmark Graphics Inc), an integrated seismic interpretation software package, where selected horizons were digitized to calculate depth to reflections below the seafloor. A constant velocity of 1500 m/s was applied through both water and sediment. Interpreted depth to bedrock (every 5 shots ) was exported into ArcGIS for interpolation into a 50-m grid. Interpreted depth to reflections were calculated, exported every 5 shots, and then imported to ArcGIS for interpolation into a continuous raster with a resolution of 50m/pixel. These data were used to generate a sediment isopach map, which shows the total thickness of sediment between the seafloor and bedrock. This information was copied from the report to assist in generating this metadata file. Process_Date: unknown Process_Step: Process_Description: This metadata file was written based on information from within the report and existing metadata. It's possible some elements that should have been removed were not removed. The original publication did not provide metadata for this dataset. Additionally, this metadata file provides links in the distribution section to the Excel spreadsheet of the sample analyses that was part of the ground truthing. That link is available in the report, but not as a separate link on the Appendix 1 - Geographic Information System page. The data is also available as part of the personal geodatabase. Added USGS persistent identifier as theme keyword. (20250923) Process_Date: 20250923 Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 x2251 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: vatnipp@usgs.gov Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: There are no attributes associated with the seismic-reflection profile images. Any trackline information available for the seismic data would be in the ArcMap 9.0 personal geodatabase. Entity_and_Attribute_Detail_Citation: U.S. Geological Survey Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Andrews Contact_Organization: U.S. Geological Survey, Woods Hole Science Center Contact_Position: Marine Geographer Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543 Country: USA Contact_Voice_Telephone: 508-548-8700 x2348 Resource_Description: The zip file contains 273 JPEG image of the seismic-reflection profiles (SeismicProfiles_zip.zip) Distribution_Liability: Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: JPEG Format_Information_Content: A ZIP file containing 585 bottom photographs. Transfer_Size: 540 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: hhttps://pubs.usgs.gov/of/2005/1293/zip/SeismicProfiles_zip.zip Network_Resource_Name: https://pubs.usgs.gov/of/2005/1293/html/appendix1.html Network_Resource_Name: https://doi.org/10.3133/ofr20051293 Access_Instructions: The first link is to download a zip file of the images, the second is to the appendix containing access to all the GIS data, and the third link is to the DOI landing page of the report. Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Fees: None Technical_Prerequisites: The user must be capable of uncompressing the zip file Metadata_Reference_Information: Metadata_Date: 20250923 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: VeeAnn A. Cross Contact_Position: Marine Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: (508) 548-8700 x2251 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: whsc_data_contact@usgs.gov Contact_Instructions: The metadata contact email address is a generic address in the event the person is no longer with the U.S. Geological Survey. Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998