Polyline shapefile of a portion of the 1-meter (m) contours in quadrangle 6 of the Stellwagen Bank Survey Area offshore of Boston, Massachusetts necessary to show small features not displayed by 5-m contours - based on bathymetry data collected by the U.S. Geological Survey from 1994-1996 (Geographic, NAD 83)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Page C. Valentine
Publication_Date: 2015
Title:
Polyline shapefile of a portion of the 1-meter (m) contours in quadrangle 6 of the Stellwagen Bank Survey Area offshore of Boston, Massachusetts necessary to show small features not displayed by 5-m contours - based on bathymetry data collected by the U.S. Geological Survey from 1994-1996 (Geographic, NAD 83)
Edition: 1
Geospatial_Data_Presentation_Form: vector digital data
Series_Information:
Series_Name: Scientific Investigations Map
Issue_Identification: 3341
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: https://doi.org/10.3133/sim3341
Online_Linkage: https://pubs.er.usgs.gov/publication/sim3341
Larger_Work_Citation:
Citation_Information:
Originator: Page C. Valentine
Originator: Leslie B. Gallea
Publication_Date: 2015
Title:
Seabed maps showing topography, ruggedness, backscatter intensity, sediment mobility, and the distribution of geologic substrates in quadrangle 6 of the Stellwagen Bank National Marine Sanctuary region offshore of Boston, Massachusetts
Edition: 1.0
Series_Information:
Series_Name: Scientific Investigations Map
Issue_Identification: 3341
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.3133/sim3341
Online_Linkage: https://pubs.er.usgs.gov/publication/sim3341
Description:
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration's National Marine Sanctuary Program, has conducted seabed mapping and related research in the Stellwagen Bank National Marine Sanctuary region since 1993. The area is approximately 3,700 square kilometers (km2) and is subdivided into 18 quadrangles. Seven maps, at a scale of 1:25,000, of quadrangle 6 (211 km2) depict seabed topography, backscatter, ruggedness, geology, substrate mobility, mud content, and areas dominated by fine-grained or coarse-grained sand. Interpretations of bathymetric and seabed backscatter imagery, photographs, video, and grain-size analyses were used to create the geology-based maps. In all, data from 420 stations were analyzed, including sediment samples from 325 locations. The seabed geology map shows the distribution of 10 substrate types ranging from boulder ridges to immobile, muddy sand to mobile, rippled sand. Substrate types are defined on the basis of sediment grain-size composition, surficial morphology, sediment layering, and the mobility or immobility of substrate surfaces. This map series is intended to portray the major geological elements (substrates, features, processes) of environments within quadrangle 6. Additionally, these maps will be the basis for the study of the ecological requirements of invertebrate and vertebrate species that utilize these substrates and guide seabed management in the region.
Purpose:
The purpose of this dataset is to release the 1-meter (m) contours that are used in quadrangle 6 Stellwagen Bank geologic interpretation maps. The 5-m contours, especially where they are widely spaced, do not adequately show the characteristic hummocky relief of the seabed in areas dominated by gravel deposits and small boulder ridges. Therefore, in areas of relatively rough seabed, the 5-m contours are supplemented by 1-m contours. The 1-m contours accentuate low-relief topographic complexity in these areas. The contours represent a close approximation of seabed microtopography, as the resolution of the multibeam echo sounder data used to generate these data is on the order of 1 m. By contrast, 1-m contours are not shown in areas where the seabed is relatively smooth and not dominated by gravel features. Any topographic complexity in these areas is beyond the resolution of the multibeam echosounder (< 1 meter in relief) and cannot be accurately depicted by the 1-m bathymetric contours.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1994
Ending_Date: 1996
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -70.221962
East_Bounding_Coordinate: -70.033546
North_Bounding_Coordinate: 42.322269
South_Bounding_Coordinate: 42.202885
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:f1e61623-e423-406c-b83e-9592c5e84303
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 Coastal and Marine Science Center
Theme_Keyword: WHCMSC
Theme_Keyword: sea-floor topography
Theme_Keyword: bathymetry
Theme_Keyword: contours
Theme_Keyword: Esri polyline shapefile
Theme_Keyword: Scientific Investigations Map 3341
Theme_Keyword: quadrangle 6
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme_Keyword: elevation
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: bathymetry
Theme_Keyword: contouring
Theme_Keyword: sea-floor characteristics
Theme_Keyword: geospatial datasets
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Massachusetts
Place_Keyword: Boston, Massachusetts
Place_Keyword: Massachusetts Bay
Place_Keyword: Stellwagen Bank
Place_Keyword: Stellwagen Bank National Marine Sanctuary
Place_Keyword: U.S. east coast
Place_Keyword: United States
Place_Keyword: North America
Place_Keyword: Atlantic Ocean
Access_Constraints: None.
Use_Constraints: Not to be used for navigation.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Page C. Valentine
Contact_Organization: U.S. Geological Survey
Contact_Position: Research 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
Contact_Voice_Telephone: (508) 548-8700 x2239
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: pvalentine@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: http://pubs.usgs.gov/sim/3341/data/SIM3341_1m_contours.jpg
Browse_Graphic_File_Description:
Thumbnail image showing the 1-meter contours in quadrangle 6 on Stellwagen Bank National Marine Sanctuary.
Browse_Graphic_File_Type: JPEG
Data_Set_Credit:
Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey as the source of this information.
Native_Data_Set_Environment:
Microsoft Windows Vista Version 6.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4095
Cross_Reference:
Citation_Information:
Originator: Page C. Valentine
Originator: Tanya S. Unger
Originator: Jessica L. Baker
Originator: Christopher F. Polloni
Publication_Date: 1999
Title:
Sun-illuminated sea floor topographic maps and perspective-view imagery of quadrangles 1-18, Stellwagen Bank National Marine Sanctuary off Boston, Massachusetts
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 99-363
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/of/of99-363/
Cross_Reference:
Citation_Information:
Originator: Page C. Valentine, editor
Publication_Date: 2005
Title:
Sea floor image maps showing topography, sun-illuminated topography, backscatter intensity, ruggedness, slope, and the distribution of boulder ridges and bedrock outcrops in the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts
Series_Information:
Series_Name: Scientific Investigations Map
Issue_Identification: 2840
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/sim/2005/2840/
Cross_Reference:
Citation_Information:
Originator: Bradford Butman
Originator: Page C. Valentine
Originator: Tammie J. Middleton
Originator: William W. Danforth
Publication_Date: 2007
Title:
A GIS library of multibeam data for Massachusetts Bay and the Stellwagen Bank National Marine Sanctuary, offshore of Boston, Massachusetts
Series_Information:
Series_Name: Data Series
Issue_Identification: 99
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Online_Linkage: http://pubs.usgs.gov/ds/99/
Data_Quality_Information:
Logical_Consistency_Report:
These 1-m contours are not based on a smoothed bathymetry terrain, nor have the contours themselves been smoothed or generalized. For this reason, these 1-m contours could possibly intersect or cross 5-m contours of the same area that are based on a filtered topography.
Completeness_Report:
This dataset only represents a portion of the 1-m contours present in quadrangle 6 of the Stellwagen Bank survey area. Only the contours necessary to show small features not displayed by 5-m contours are maintained. The 1-m contours produce visual patterns that are helpful to the user by calling attention to low-relief topographic complexity in areas of hummocky relief dominated by gravel deposits and small boulder ridges. These 1-m contours represent a close approximation of seabed microtopography, as the bathymetric data upon which they are based approaches the resolution of the multibeam echo sounder that collected the data. By contrast, 1-m contours are not shown in areas where the seabed is relatively smooth and not dominated by gravel features. In those areas, changes in water depths recorded by the sonar are not resolvable to the extent that they can be contoured at a 1-m interval and produce usable information. Such contours produce incoherent patterns of lines that misrepresent topographic complexity of the seabed.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
These data were navigated with a differential global positioning system (DGPS) with an assumed accuracy of +/- 10 meters.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
These data have been corrected for vessel motion (roll, pitch, heave, yaw) and tidal offsets, and referenced to mean lower low water. The manufacturer's reported vertical resolution of the Simrad EM-1000 multibeam echo sounder is 1% of water depth, which is less than 2 m given the depths within the study area (~30 to 184 m). Data were corrected for tidal elevation using the NOAA Boston tide gauge.
Lineage:
Process_Step:
Process_Description:
Initial data collection and processing is described in Valentine and others 1999, Valentine 2005, and Butman and others, 2007. A summary of that information is presented here. Surveying was conducted aboard the Canadian Hydrographic Service vessel Frederick G. Creed using a hull mounted multibeam echo sounder. These data were collected using a Simrad Subsea EM1000 operating at 95 kHz. SwathEd software (version unknown) developed by the Ocean Mapping Group, University of New Brunswick, was used to process the bathymetric and navigation data. The processing included editing the data to remove spurious points as well as incorporate tidal corrections. Processing took place over a span of time, 1994 to 1996.
Process_Date: 1996
Process_Step:
Process_Description:
The remaining process steps are a function of incorporating information from the previous publications (noted in cross-references), along with processing notes maintained during data processing. The final SwathEd-produced file (based on a 10-meter-grid cell size) was converted to an ASCII file using the University of New Brunswick script r4toASCII. The format of the ASCII file is latitude, longitude, and depth. The ASCII file was converted to an ArcInfo ungenerate format using a Perl script. The resulting format is ID, longitude, latitude, and negative depth. Each point has a unique ID value. Using ArcInfo 7.03, the ungenerate format was converted to a coverage format using the 'convert to arc' from 'generate tool' available in ArcTools. The 'build' command with the point option was then used to convert the data to a point coverage. This procedure generates the point locations stored in the ungenerate file, but does not incorporate the depth values. In order to include depth, the ungenerate file - which has location as well as depth - was converted to an ArcInfo table, using 'Tables' in ArcInfo. The structure of the ArcInfo table was defined to include the ID, longitude, latitude, and depth in the appropriate format and size. Longitude and latitude were defined as floating point numbers with six decimal places, while depth was defined as a floating point number with two decimal places. To add the depth value to the point coverage, ArcInfo 'Tables' was used to join the point attribute table (pat) of the coverage to the newly-generated data table based on the ID value. In order to join the tables, the data table ID field had to be renamed to match the automatically assigned coverage ID field. The projection of the point coverage was defined in ArcInfo with the PROJECTDEFINE command and the following parameters: Projection Geographic; Datum NAD83; Units DD; Spheroid GRS80. This process was performed by Jessica Baker in 1997. Then the coverage was projected to the custom Mercator projection using the ArcInfo PROJECT command with the following options: Projection Mercator; Datum NAD83, Spheroid GRS1980; Units Meters; Longitude of Central Meridian -70degrees 19minutes; Latitude of true scale 41degrees 39minutes; False Easting 0; False northing 0. This process was performed by Jessica Baker in 1997. The final step was to convert the points to a grid. This was accomplished using the ArcInfo 'pointgrid' command. The depth attribute was gridded at a cell-size of 13 m, and the background value was set to nodata. This final processing step was performed in 1997, and is the basis for the subsequent work with contours. However, this process was repeated by Tammie Middleton in 2001 and is the grid presented in this SIM. The 13-m cell-size was chosen because it appeared to be the best cell size to avoid striping in the data when processing with the SwathEd software.
Process_Date: 1997
Process_Step:
Process_Description:
The original Mercator grid was projected to a geographic coordinate system using the ArcInfo PROJECT command. Once this was done, the Arc/Info routine lattice contour was used to generate the 1-m contours. Extensive editing was done with ArcEdit to remove contours from areas where the seabed is relatively smooth and small features cannot be contoured based on the multibeam bathymetric data. Although each quadrangle was contoured independently, the contours were manually edited to remove "boundary faults". All of the editing work was done by Jessica Baker and Tanya Unger from 1997 to 1999.
Process_Date: 1999
Source_Produced_Citation_Abbreviation: arc6ctr1geo
Process_Step:
Process_Description:
The 1-m coverage file was added to ArcMap 9.3.1. This dataset was then exported to a shapefile. This process step and the subsequent process step were performed by the same person: VeeAnn A. Cross.
Source_Used_Citation_Abbreviation: arc6ctr1geo
Process_Date: 2012
Source_Produced_Citation_Abbreviation: Q6_1m_contours.shp
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
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
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Metadata for the 1-m contours was compiled to enable releasing the data as part of a USGS publication. The information used to pull together the metadata was from previous publications, the extensive data processing log prepared by Tanya Unger and Jessica Baker, as well as the individual log files generated during ArcInfo data processing. While writing the metadata, seven records with a contour value of zero were found. It was determined that these contours were erroneous so they were deleted.
Source_Used_Citation_Abbreviation: Q6_1m_contours.shp
Process_Date: 2012
Source_Produced_Citation_Abbreviation: Q6_1m_contours.shp
Process_Step:
Process_Description:
Removed the attributes associated with the original coverage that were not necessary for the shapefile (such as FNODE, TNODE).
Source_Used_Citation_Abbreviation: Q6_1m_contours.shp
Process_Date: 2012
Source_Produced_Citation_Abbreviation: Q6_1m_contours.shp
Process_Step:
Process_Description:
Renamed the shapefile after review to coincide with the publication series number.
Source_Used_Citation_Abbreviation: Q6_1m_contours.shp
Process_Date: 201509
Source_Produced_Citation_Abbreviation: SIM3341_1m_contours.shp
Process_Step:
Process_Description: USGS Thesaurus keywords added to the keyword section.
Process_Date: 20180720
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: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Process_Step:
Process_Description:
Added keywords section with USGS persistent identifier as theme keyword.
Process_Date: 20200908
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: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 846
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000001
Longitude_Resolution: 0.000001
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:
Depth_System_Definition:
Depth_Datum_Name: Mean lower low water
Depth_Resolution: 1
Depth_Distance_Units: meters
Depth_Encoding_Method: Attribute values
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: SIM3341_1m_contours
Entity_Type_Definition:
Portion of the 1 meter contours that fall within quadrangle 6 of the Stellwagen Bank study area.
Entity_Type_Definition_Source: U.S. Geological Survey
Attribute:
Attribute_Label: FID
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: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: CONTOUR
Attribute_Definition:
These values represent depth. The more negative the value, the deeper the water. Depths are relative to mean lower low water datum.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -36
Range_Domain_Maximum: -183
Attribute_Units_of_Measure: meters
Attribute_Measurement_Resolution: 1
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Page C. Valentine
Contact_Organization: U.S. Geological Survey
Contact_Position: Research 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
Contact_Voice_Telephone: (508) 548-8700 x2239
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: pvalentine@usgs.gov
Resource_Description:
SIM3341_1m_contours.zip containing SIM3341_1m_contours.shp and the shapefile components as well as FGDC metadata and the browse graphic SIM3341_1m_contours.jpg.
Distribution_Liability:
Neither the U.S. Government, the Department of the Interior, nor the U.S. Geological Survey, nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. 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: Shapefile
Format_Version_Number: ArcGIS 9.3.1
Format_Information_Content:
The WinZip (version 14.0) file contains the data in shapefile format, the browse graphic, and the associated FGDC metadata.
Transfer_Size: 0.6
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Fees: None.
Technical_Prerequisites:
These data are available in Environmental Systems Research Institute (Esri) shapefile format. The user must software capable of reading this format. The data are available for download in WinZip format.
Metadata_Reference_Information:
Metadata_Date: 20200908
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: VeeAnn A. Cross
Contact_Organization: U.S. Geological Survey
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
Contact_Voice_Telephone: (508) 548-8700 x2251
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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