Identification_Information: Citation: Citation_Information: Originator: Elizabeth Pendleton Publication_Date: 2013 Title: NAH_CCB_sedcover: Sediment Texture Units of the Sea Floor from Nahant to Northern Cape Cod Bay, Massachusetts (polygon shapefile, Geographic, WGS84) Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2012-1157 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: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/SedimentTexture/SedCover.zip Larger_Work_Citation: Citation_Information: Originator: Pendleton, E.A. Originator: Baldwin, W.E. Originator: Barnhardt., W.A. Originator: Ackerman, S.D. Originator: Foster, D.S. Originator: Andrews, B.D. Originator: Schwab, W.C. Publication_Date: 2013 Title: Shallow Geology, Sea-floor Texture, and Physiographic Zones of the Inner Continental Shelf from Nahant to Northern Cape Cod Bay, Massachusetts Series_Information: Series_Name: Open-File Report Issue_Identification: 2012-1157 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: Description: Abstract: These data are qualitatively derived interpretive polygon shapefiles and selected source raster data defining surficial geology, sediment type and distribution, and physiographic zones of the sea floor from Nahant to Northern Cape Cod Bay. Much of the geophysical data used to create the interpretive layers were collected under a cooperative agreement among the Massachusetts Office of Coastal Zone Management (CZM), the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, the National Oceanic and Atmospheric Administration (NOAA), and the U.S. Army Corps of Engineers (USACE). Initiated in 2003, the primary objective of this program is to develop regional geologic framework information for the management of coastal and marine resources. Accurate data and maps of seafloor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes because of natural or human effects. The project is focused on the inshore waters of coastal Massachusetts. Data collected during the mapping cooperative involving the USGS have been released in a series of USGS Open-File Reports (http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html). The interpretations released in this study are for an area extending from the southern tip of Nahant to Northern Cape Cod Bay, Massachusetts. A combination of geophysical and sample data including high resolution bathymetry and lidar, acoustic-backscatter intensity, seismic-reflection profiles, bottom photographs, and sediment samples are used to create the data interpretations. Most of the nearshore geophysical and sample data (including the bottom photographs) were collected during several cruises between 2000 and 2008. More information about the cruises and the data collected can be found at the Geologic Mapping of the Seafloor Offshore of Massachusetts Web page: http://woodshole.er.usgs.gov/project-pages/coastal_mass/. Purpose: These sea floor sediment cover data were created from geophysical and sample data collected from Nahant to Northern Cape Cod Bay, and are used to characterize the sea floor in the area. Sediment type and distribution maps are important data layers for marine resource managers charged with protecting fish habitat, delineating marine boundaries, and assessing environmental change due to natural or human impacts. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19940101 Ending_Date: 20080507 Currentness_Reference: ground condition of the source data that this interpretation is based on Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.051972 East_Bounding_Coordinate: -70.154205 North_Bounding_Coordinate: 42.459855 South_Bounding_Coordinate: 41.932269 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 Coastal and Marine Science Center Theme_Keyword: WHCMSC Theme_Keyword: Massachusetts Office of Coastal Zone Management Theme_Keyword: CZM Theme_Keyword: Sea floor Theme_Keyword: Marine Geology Theme_Keyword: Interpretation Theme_Keyword: Bathymetry Theme_Keyword: Backscatter Theme_Keyword: Slope Theme_Keyword: Topography Theme_Keyword: Esri Shapefile Theme_Keyword: Bottom Type Theme_Keyword: Sediment Cover Theme_Keyword: Sediment Texture Theme_Keyword: Sediment Distribution Theme_Keyword: Bottom Photographs Theme_Keyword: Sediment Samples Theme_Keyword: Seismic-reflection Profiles Theme_Keyword: Shepard classification Theme_Keyword: Lidar Theme_Keyword: interpretation Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans and estuaries 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: Boston Harbor Islands Place_Keyword: Duxbury Place_Keyword: Provincetown Place_Keyword: Plymouth Place_Keyword: Scituate Place_Keyword: Cohasset Place_Keyword: Manomet Place_Keyword: Winthrop Place_Keyword: Cape Cod Bay Place_Keyword: Humarock Place_Keyword: Brant Rock Place_Keyword: Marshfield Place_Keyword: North River Place_Keyword: Kingston Place_Keyword: Revere Beach Place_Keyword: Quincy Place_Keyword: Weymouth Stratum: Stratum_Keyword_Thesaurus: General Stratum_Keyword: Seafloor Access_Constraints: None Use_Constraints: Not to be used for navigation. 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. Additionally, there are limitations associated with qualitative sediment mapping interpretations. Because of the scale of the source geophysical data and the spacing of samples, not all changes in sea floor texture are captured. The data were mapped between 1:8,000 and 1:25,000, but the recommended scale for application of these data is 1:25,000. Features below 5,000 m2 or less than 50 m wide were not digitized due to positional uncertainty, lack of sample information, and the often ephemeral nature of small-scale sea floor features. Not all digitized sea floor features contained sample information, so often the sea floor texture is characterized by the nearest similar feature that contains a sample. Conversely, sometimes a digitized feature contained multiple samples and not all of the samples within the feature were in agreement (of the same texture). In these cases the dominant sediment texture was chosen to represent the primary texture for the polygon. Samples from rocky areas often only consist of bottom photographs, because large particle size often prevents the recovery of a sediment sample. Bottom photo classification can be subjective, such that determining the sediment type that is greater than 50% of the view frame is estimated by the interpreter and may differ among interpreters. Bottom photo transects often reveal changes in the sea floor over distances of less than 100 m and these changes are often not observable in acoustic data. Heterogeneous sea floor texture can change very quickly, and many small-scale changes will not be detectable or mappable at a scale of 1:25,000. The boundaries of polygons are often inferred based on sediment samples, and even boundaries that are traced based on amplitude changes in geophysical data are subject to migration. Polygon boundaries should be considered an approximation of the location of a change in texture. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 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 x2259 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/SedimentTexture/sedcover_browse.png Browse_Graphic_File_Description: Image of the sediment texture and distribution shapefile for the Massachusetts inner continental shelf from Nahant to Northern Cape Cod Bay Browse_Graphic_File_Type: PNG Native_Data_Set_Environment: Microsoft Windows 7.1 (Build 7601) Service Pack 1; ESRI ArcCatalog 9.3.1.4000 Cross_Reference: Citation_Information: Originator: Kelley, J.T. Originator: Barnhardt, W.A. Originator: Belknap, D.F. Originator: Dickson, S.M. Originator: Kelley, A.R. Publication_Date: 1996 Title: The Seafloor Revealed: The Geology of the Northwestern Gulf of Maine Inner Continental Shelf Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Maine Geological Survey Open-File Report Issue_Identification: 96-6 Publication_Information: Publication_Place: Augusta, Maine Publisher: Maine Geological Survey, Natural Resources Information and Mapping Center Cross_Reference: Citation_Information: Originator: Shepard, F.P. Publication_Date: 1954 Title: Nomenclature Based on Sand-Silt-Clay Ratios Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Journal Sedimentary Petrology Issue_Identification: volume 24 Publication_Information: Publication_Place: Tulsa, OK Publisher: Society for Sedimentary Geology Cross_Reference: Citation_Information: Originator: Barnhardt, W.A. Originator: Kelley, J.T. Originator: Dickson, S.M. Originator: Belknap, D.F. Publication_Date: 1998 Title: Mapping the Gulf of Maine with Side-scan Sonar: a New Bottom-type Classification for Complex Seafloors Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Journal of Coastal Research Issue_Identification: volume 14(2) Publication_Information: Publication_Place: Royal Palm Beach, FL Publisher: Coastal Education and Research Foundation, Inc. Cross_Reference: Citation_Information: Originator: Wentworth, C.K. Publication_Date: 1922 Title: A Scale of Grade and Class Terms for Clastic Sediments Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Journal of Geology Issue_Identification: vol. 30 Publication_Information: Publication_Place: Chicago, IL Publisher: University of Chicago Press Cross_Reference: Citation_Information: Originator: McMullen, K.Y Originator: Paskevich, V.F. Originator: Poppe, L.J. Publication_Date: 2011 Title: USGS East-coast Sediment Analysis: Procedures, Database, and GIS Data Edition: 2.2 Geospatial_Data_Presentation_Form: vector digital data Series_Information: Series_Name: Open File Report Issue_Identification: 2005-1001 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: http://pubs.usgs.gov/of/2005/1001/ Cross_Reference: Citation_Information: Originator: Ford, K.H. Originator: S.E. Voss Publication_Date: 2010 Title: Seafloor Sediment Composition in Massachusetts Determined Using Point Data Edition: 1.0 Geospatial_Data_Presentation_Form: document Series_Information: Series_Name: Massachusetts Division of Marine Fisheries Technical Report Issue_Identification: TR-45 Publication_Information: Publication_Place: New Bedford, MA Publisher: Massachusetts Division of Marine Fisheries Online_Linkage: Data_Quality_Information: Logical_Consistency_Report: These data were drawn and vetted for accuracy using the source input rasters and point sample data described in the processing steps and source contributions. Qualitatively-defined polygons for the Boston Harbor and approaches region had already been drawn and published by Ackerman and others (2006). In their study, their region of interest was defined by using a 'convert raster to feature' function on sidescan sonar imagery within ArcGIS. This conversion task created several very small (~ 1 square-meter) triangular and rectilinear-shaped gaps along the boundaries of the defined polygons within Boston Harbor. The original Ackerman and other (2006) bottom type polygons were merged with the polygons created in this study, and polygon and field editing was done in order to make them fit the classification schemes used in this report. However, the very small topology errors associated with the original data have not been removed, primarily because they are well below the intended scale of application of these data (1:25,000). Overlapping features and unintentional gaps within the rest of the survey area were identified using the topology checker in ArcMap (version 9.3.1) and corrected or removed. Completeness_Report: These sediment cover data are defined for areas where source data exists. In general, gaps in the coverage coincide with gaps in the source data. However, some small data gaps were interpreted through extrapolation. Areas of lower data quality and incomplete coverage are noted in a data confidence attribute field. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: These data were produced qualitatively from acoustic and sample data with varying resolutions. Horizontal uncertainty associated with sample collection especially, can be quite high (100's of meters), much higher than positional uncertainty associated with acoustic data (usually less than <10's of meters). The date of sample collection and ship station positioning all contribute to sample position uncertainty. These qualitatively derived polygons outlining sea floor features are estimated to be within 50 meters, horizontally, but locally may be higher when sediment texture delineation is based on sample information alone. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: Although there is a field for mean water depth, there is no assumption of vertical accuracy. The depth value is an average of all grid cells ( 50%) Rock (R) is given the upper case letter and the subordinate texture (< 50%) gravel (g) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Gr Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Gravel (G) is given the upper case letter and the subordinate texture (< 50%) rock (r) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Gs Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Gravel (G) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: M Enumerated_Domain_Value_Definition: The end-member texture (~ 100%) Mud (M) is the primary texture. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Ms Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Mud (M) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: S Enumerated_Domain_Value_Definition: The end-member texture (~ 100%) Sand (S) is the primary texture. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Sg Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) gravel (g) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: Barnhardt and others (1998) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Sm Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) mud (m) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Rs Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Rock (R) is given the upper case letter and the subordinate texture (< 50%) sand (s) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Sr Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Sand (S) is given the upper case letter and the subordinate texture (< 50%) rock (r) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: Mg Enumerated_Domain_Value_Definition: The dominant texture (> 50%) Mud (M) is given the upper case letter and the subordinate texture (< 50%) gravel (g) is given a lower case letter. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: G Enumerated_Domain_Value_Definition: The end-member texture (~ 100%) Gravel (G) is the primary texture. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: N/A Enumerated_Domain_Value_Definition: There was not enough source input data to define sediment texture within this area. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: shep_code Attribute_Definition: sediment nomenclature based on sand-silt-clay ratios defined in the CZM sample database Attribute_Definition_Source: Shepard (1954) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sand Enumerated_Domain_Value_Definition: Sediment whose main phase is <2 mm, but >0.062 mm Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: gravel Enumerated_Domain_Value_Definition: Sediment whose main phase (usually >50%) is >2 mm Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sandy silt Enumerated_Domain_Value_Definition: Sediment whose main phase is silt, but with significant sand Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: solid Enumerated_Domain_Value_Definition: Sediment whose main phase is rock, cobble, or boulder Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: silty sand Enumerated_Domain_Value_Definition: Sediment whose main phase is sand, but with significant silt Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: silt Enumerated_Domain_Value_Definition: Sediment whose main phase (usually >50%) is < 0.062 mm Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: N/A Enumerated_Domain_Value_Definition: There was not enough source input data to define sediment texture within this area. Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: gravelly sediment Enumerated_Domain_Value_Definition: ediment whose main phase is >2 mm, but with significant other sediment. Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: clayey silt Enumerated_Domain_Value_Definition: Sediment whose main phase is silt, but with significant clay. Enumerated_Domain_Value_Definition_Source: USGS East Coast Sediment Texture Database data dictionary Attribute: Attribute_Label: simple Attribute_Definition: sediment nomenclature based on 3 simple classes: sand, mud, hardbottom as defined in the CZM sample database Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: sand Enumerated_Domain_Value_Definition: Sediment whose primary component (> 50%) is sand Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: hardbottom Enumerated_Domain_Value_Definition: Sediment whose primary component is rock, boulder, cobble, or coarse gravel Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: mud Enumerated_Domain_Value_Definition: Sediment whose primary component (> 50%) is silt and clay Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: N/A Enumerated_Domain_Value_Definition: There was not enough source input data to define simple sediment texture within this area. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: bedforms Attribute_Definition: text field that describes the presence or absence of bedforms on the sea floor based on geophysical raster data Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: yes Enumerated_Domain_Value_Definition: bedforms are present within some part of the traced polygon in the source acoustic data Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: N/A Enumerated_Domain_Value_Definition: bedforms are not present within any part of the traced polygon in the source acoustic data Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: phi_class Attribute_Definition: Sediment class as defined by Wentworth classification determined using labratory analyzed samples in the CZM sample database Attribute_Definition_Source: Wentworth (1922) Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: coarse pebbles Enumerated_Domain_Value_Definition: sediment class whose phi size is between -4 and -5 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: coarse silt Enumerated_Domain_Value_Definition: sediment class whose phi size is between 4 and 5 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: coarse sand Enumerated_Domain_Value_Definition: sediment class whose phi size is between 0 and 1 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: cobble Enumerated_Domain_Value_Definition: sediment class whose phi size is between -6 and -8 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: fine pebbles Enumerated_Domain_Value_Definition: sediment class whose phi size is between -2 and -3 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: fine sand Enumerated_Domain_Value_Definition: sediment class whose phi size is between 2 and 3 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: fine silt Enumerated_Domain_Value_Definition: sediment class whose phi size is between 6 and 7 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: granules Enumerated_Domain_Value_Definition: sediment class whose phi size is between -1 and -2 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: medium pebbles Enumerated_Domain_Value_Definition: sediment class whose phi size is between -3 and -4 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: medium sand Enumerated_Domain_Value_Definition: sediment class whose phi size is between 2 and 1 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: medium silt Enumerated_Domain_Value_Definition: sediment class whose phi size is between 5 and 6 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: solid Enumerated_Domain_Value_Definition: sediment class whose phi size could not be determined from grain size data, but was determined to be rock based on acoustic data Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: very coarse pebbles Enumerated_Domain_Value_Definition: sediment class whose phi size is between -5 and -6 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: very coarse sand Enumerated_Domain_Value_Definition: sediment class whose phi size is between 0 and -1 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: very fine sand Enumerated_Domain_Value_Definition: sediment class whose phi size is between 3 and 4 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: very fine silt Enumerated_Domain_Value_Definition: sediment class whose phi size is between 7 and 8 Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: N/A Enumerated_Domain_Value_Definition: sediment class whose phi size could not be determined from grain size data or there were no samples with laboratory analyzed grain size statistics within the polygon Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Data_confi Attribute_Definition: Each interpreted polygon was assigned a data interpretation confidence value from 1-4 based on the quality and number of input data sources. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 1 Enumerated_Domain_Value_Definition: Sediment texture regions that were defined based on the highest resolution bathymetry (5m) and backscatter (1m), bottom photos, sediment samples, and seismic interpretations were given the highest data interpretation confidence value of 1. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 2 Enumerated_Domain_Value_Definition: Areas where sediment texture was defined based on bathymetry of 30m resolution, backscatter of 1m resolution, bottom photos, and sediment samples were given an interpretation confidence value of 2. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 3 Enumerated_Domain_Value_Definition: A confidence value of 3 was given to areas with multibeam bathymetric and backscatter resolution of 10m and sediment samples, but no bottom photos or high density seismic interpretations were available. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 4 Enumerated_Domain_Value_Definition: The lowest confidence values (4) were given to areas where only lidar data at 2.5m resolution (and near full coverage) and sediment samples were available. Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Enumerated_Domain: Enumerated_Domain_Value: 0 Enumerated_Domain_Value_Definition: no cofidence in interpretation because there was not enough source data to make an interpretation Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey Attribute: Attribute_Label: Count_ Attribute_Definition: The number of sediment samples (with laboratory analyzed grain size statistics) that occur within each qualitatively-derived polygon. This field is automatically generated by Esri when point data (sample database) is joined to a polygon (sediment texture interpretation). Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 85 Attribute_Units_of_Measure: count Attribute_Measurement_Resolution: 1 Attribute: Attribute_Label: Avg_GRAVEL Attribute_Definition: Average percent weight (%) gravel (as determined from samples with laboratory analyzed grain size statistics) within each qualitatively derived polygon. This field was automatically generated by Esri as a summary of the numeric attributes of the points that fall inside a polygon when point data (sample database) is joined to a polygon (sediment texture interpretation). -999 is a no data value Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 89.9 Attribute_Units_of_Measure: percent Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: Avg_SAND Attribute_Definition: Average percent weight (%) sand (as determined from samples with laboratory analyzed grain size statistics) within each qualitatively derived polygon. This field was automatically generated by Esri as a summary of the numeric attributes of the points that fall inside a polygon when point data (sample database) is joined to a polygon (sediment texture interpretation). -999 is a no data value Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.79 Range_Domain_Maximum: 100 Attribute_Units_of_Measure: percent Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Avg_SILT Attribute_Definition: Average percent weight (%) silt (as determined from samples with laboratory analyzed grain size statistics) within each qualitatively derived polygon. This field was automatically generated by Esri as a summary of the numeric attributes of the points that fall inside a polygon when point data (sample database) is joined to a polygon (sediment texture interpretation). -999 is a no data value Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 68.37 Attribute_Units_of_Measure: percent Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: Avg_CLAY Attribute_Definition: Average percent weight (%) clay (as determined from samples with laboratory analyzed grain size statistics) within each qualitatively derived polygon. This field was automatically generated by Esri as a summary of the numeric attributes of the points that fall inside a polygon when point data (sample database) is joined to a polygon (sediment texture interpretation). -999 is a no data value Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0 Range_Domain_Maximum: 44.98 Attribute_Units_of_Measure: percent Attribute_Measurement_Resolution: 0.1 Attribute: Attribute_Label: Avg_PHI Attribute_Definition: Average phi size within each qualitatively derived polygon (-999 is a no data value, which means there were no samples with laboratory analyzed grain size statistics within that polygon) Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -4.07 Range_Domain_Maximum: 7.83 Attribute_Units_of_Measure: phi Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: mean_depth Attribute_Definition: Average water depth within each qualitatively derived polygon. Attribute_Definition_Source: U.S. Geological Survey Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -61.15 Range_Domain_Maximum: -0.07 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Shape_Leng Attribute_Definition: Length of feature in meters. Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 125.941 Range_Domain_Maximum: 144652.135 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.001 Attribute: Attribute_Label: Shape_Area Attribute_Definition: Area of feature in meters squared. Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 899.009 Range_Domain_Maximum: 208403761.365 Attribute_Units_of_Measure: meters squared Attribute_Measurement_Resolution: 0.001 Attribute_Domain_Values: Unrepresentable_Domain: Positive real numbers that are automatically generated. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 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 x2259 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Neither the U.S. Government, the Department of the Interior, nor the USGS, 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 U.S. Geological Survey 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: WinZip Format_Version_Number: 14.5 Format_Specification: Esri Polygon Shapefile Format_Information_Content: WinZip file contains qualitatively derived polygons that define sea floor texture and distribution from Nahant to Northern Cape Cod Bay, MA and the associated metadata File_Decompression_Technique: WinZip or pkUnzip Transfer_Size: 1.87 MB Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/GIS_catalog/SedimentTexture/SedCover.zip Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/html/GIS_catalog.html Network_Resource_Name: http://pubs.usgs.gov/of/2012/1157/ Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Fees: None Technical_Prerequisites: These data are available in Environmental Systems Research Institute (Esri) shapefile format. The user must have software capable of importing and processing this data type. Metadata_Reference_Information: Metadata_Date: 20130702 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Elizabeth A. Pendleton Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 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 x2259 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: ependleton@usgs.gov 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