Identification_Information: Citation: Citation_Information: Originator: Seth Ackerman Publication_Date: 2006 Title: bh_1mBS.tif: Backscatter Imagery from Sidescan Sonar 1 meter/pixel of Boston Harbor and Approaches Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1008 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2006/1008/gis/datazipped/bh_1mbs.zip Larger_Work_Citation: Citation_Information: Originator: Ackerman, S.D. Originator: Butman, B. Originator: Barnhardt, W.B. Originator: Danforth, W.W. Originator: Crocker, J.M. Publication_Date: 2006 Title: High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1008 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Other_Citation_Details: 1 DVD-ROM Online_Linkage: http://pubs.usgs.gov/of/2006/1008 Description: Abstract: These data are high-resolution acoustic backscatter measurements of the seafloor from Boston Harbor and the harbor approaches, Massachusetts. Approximately 170 kmē of sidescan sonar data were collected by the National Oceanic and Atmospheric Administration (NOAA) Ship Whiting in 2000 and 2001 and reprocessed by the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS). Purpose: These data were collected by the National Oceanic and Atmospheric Administration (NOAA) National Ocean Service (NOS) branch as part of their periodic hydrographic mapping for nautical charting. The raw datasets were provided by NOAA to the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS) in Woods Hole, MA as part of a cooperative agreement to provide high resolution bathymetry and backscatter intensity maps and digital GIS information for resource management, scientific research, industry and the public. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20000919 Ending_Date: 20011030 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.066756 East_Bounding_Coordinate: -70.806420 North_Bounding_Coordinate: 42.438013 South_Bounding_Coordinate: 42.253690 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: Woods Hole Science Center Theme_Keyword: WHSC Theme_Keyword: Massachusetts Office of Coastal Zone Management Theme_Keyword: CZM Theme_Keyword: Seafloor Theme_Keyword: Marine Geology Theme_Keyword: Sidescan Theme_Keyword: Sidescan Sonar Theme_Keyword: Edgetech Theme_Keyword: 272-T Theme_Keyword: Klein Theme_Keyword: 5500 Theme_Keyword: National Oceanic and Atmospheric Administration Theme_Keyword: NOAA Theme_Keyword: National Ocean Service Theme_Keyword: NOS Theme_Keyword: NOAA Ship Whiting Theme_Keyword: Hydrographic Survey Theme_Keyword: GeoTIFF image Theme_Keyword: greyscale image Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans and estuaries Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: geoscientificinformation Place: Place_Keyword_Thesaurus: General Place_Keyword: Massachusetts Bay Place_Keyword: Atlantic Ocean Place_Keyword: Boston Harbor Place_Keyword: Nahant Place_Keyword: Boston Place_Keyword: Hull Place_Keyword: Hubline Place_Keyword: Boston Harbor Islands Stratum: Stratum_Keyword_Thesaurus: General Stratum_Keyword: Seafloor Access_Constraints: None Use_Constraints: Public domain data from the U.S. Government are 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: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: 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 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us 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: These data have not been quantitatively compared to previous hydrographic data, although they generally agree with qualitative comparison of published NOAA charts. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: All of the NOAA survey vessels were equipped with Trimble DSM212L Differential Global Positioning System (DGPS) receivers. Launch 1005, which collected all of the multibeam bathymetry, was also equipped with a TSS POS/MV Model 320 (Position and Orientation System for Marine Vessels). Standard bathymetric processing, including tide corrections, soundings accuracy, and quality control were done by the NOAA Office of Coast Survey. Lineage: Source_Information: Type_of_Source_Media: External Hard Drive Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20000919 Ending_Date: 20011030 Source_Currentness_Reference: ground condition Source_Contribution: The original geophysical data for this project were collected during four hydrographic surveys conducted by NOAA NOS in 2000 and 2001 on the NOAA Ship Whiting and its launches 1005/1014. Multibeam bathymetric data were acquired with a Reson SeaBat 8101 and sidescan sonar backscatter data were acquired with Edgetech model 272-T (100 kHz) or the Klein T-5500 (455 kHz) sonar systems. Process_Step: Process_Description: Sidescan data were acquired by NOAA NOS with the Edgetech model 272-T (100 kHz) or the Klein T-5500 (455 kHz) sidescan sonar systems. Equipment was either hull mounted or towed. Range, layback, gain and other acquisition parameters varied and were adjusted accordingly in the acquisition software. Raw .xtf sonar files were transferred from NOAA NOS to the USGS/CZM. Process_Step: Process_Description: The raw sidescan-sonar data were processed using XSonar/ShowImage software. The processing steps included demultiplexing the raw sidescan data using a median filtering routine to suppress speckle noise, a file check of navigation points to delete repeated fixes or other logging errors, correct for slant-range distortion, signal attenuation, and dropped sonar lines (Danforth, W.W., 1997, Xsonar/ShowImage: A complete system for rapid sidescan-sonar processing and display: U.S. Geological Survey Open File Report 97-686, 77 p.). Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Process_Step: Process_Description: PCI Geomatics is a commercially available software package used to digitally mosaic sidescan-sonar records. The geographically oriented raster imagery is imported as individual line files. Adjacent sidescan-sonar records are compared to establish ground control points at common target locations. This helps to correct for navigational errors and potential feature offset due to undefined layback of the tow vehicle. A stencil line is drawn around an individual swath record to crop and paste it on an adjacent swath. This procedure is repeated for each sidescan-sonar line swath to form a composite digital mosaic of the area. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Process_Step: Process_Description: A linear stretch was applied in to the sidescan sonar image to make adjacent areas mapped with different sonar systems internally consistent. The processed data from a given system, in many cases, were constrained to a limited range of backscatter intensity values. Adjustments were made to the greyscale imagery to tone-match and keep each survey internally consistent. The process described above for mosaicking in PCI was then repeated of each area mapped by a specific system and the patchwork of sidescan sonar images were combined into a composite image for the entire study area. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Process_Step: Process_Description: A linear contrast stretch was applied to the final image. The lightest and darkest pixel levels were clipped to the upper and lower limits of the image's histogram. This redistributed the remaining levels between 0-255. The redistribution increases the tonal range of the image, improving the visual contrast between areas that originally had small tonal differences. Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Pixel Row_Count: 20000 Column_Count: 21000 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 19 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.999600 Longitude_of_Central_Meridian: -69.000000 Latitude_of_Projection_Origin: 0.000000 False_Easting: 500000.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 1.000000 Ordinate_Resolution: 1.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Band_1 Attribute: Attribute_Label: ObjectID Attribute_Definition: Internal feature number. Attribute_Definition_Source: ESRI Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Value Attribute: Attribute_Label: Count Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Resource_Description: Downloadable Data Distribution_Liability: Although this data set has been used by the U.S. Geological Survey (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. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: TIFF Format_Version_Number: ArcGIS 9.0 Format_Specification: GeoTIFF File_Decompression_Technique: no compression applied Transfer_Size: 400.54 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: Network_Resource_Name: Network_Resource_Name: Offline_Option: Offline_Media: DVD-ROM Recording_Format: UDF Fees: None Technical_Prerequisites: This image is available as a GeoTIFF image with an accompanying world file. To utilize this data, the user must have an image viewer, image processing or GIS software package capable of importing a GeoTIFF image. Metadata_Reference_Information: Metadata_Date: 20060626 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: Massachusetts Office of Coastal Zone Management Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: c/o U.S. Geological Survey Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: seth.ackerman@state.ma.us Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Time_Convention: local time Metadata_Access_Constraints: None Metadata_Use_Constraints: None Metadata_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile