Identification_Information: Citation: Citation_Information: Originator: Page C. Valentine Publication_Date: 2005 Title: rugged: Sea floor ruggedness analysis for the Stellwagen Bank National Marine Sanctuary region. Edition: 1.0 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2840 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/sim/2005/2840/data/rugged/rugged.zip Larger_Work_Citation: 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 Edition: 1.0 Series_Information: Series_Name: Scientific Investigations Map Issue_Identification: 2840 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/sim/2005/2840/ Description: Abstract: The Terrain Ruggedness Index (TRI) calculates the average difference in elevation between a small area (a center pixel of 13 x 13 m) and its surrounding area (neighboring pixels). The TRI was applied to the digital bathymetric grids of the seafloor of the Stellwagen Bank National Marine Sanctuary region off Boston, Massachusetts to create an analysis of sea floor ruggedness. Purpose: The Terrain Ruggedness Index provides an interpretation of the seabed features in the highly variable geomorphology of the Stellwagen Bank National Marine Sanctuary region. The seabed geometry is variable due to its glacial origin and is important to the region's wide range of habitats and high biodiversity. Time_Period_of_Content: Time_Period_Information: Single_Date/Time: Calendar_Date: 2005 Currentness_Reference: publication date Status: Progress: Complete Maintenance_and_Update_Frequency: As needed Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.600077 East_Bounding_Coordinate: -70.033436 North_Bounding_Coordinate: 42.800106 South_Bounding_Coordinate: 42.083366 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: Geographic Information Systems Theme_Keyword: GIS 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: topographic data Theme_Keyword: sea floor topography Theme_Keyword: bathymetry Theme_Keyword: ruggedness Theme_Keyword: terrain ruggedness index Theme_Keyword: TRI Theme_Keyword: sea floor features 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 Place_Keyword: MA Place_Keyword: Stellwagen Bank National Marine Sanctuary Place_Keyword: SBNMS Place_Keyword: Shallow EEZ Place_Keyword: EEZ Place_Keyword: Gulf of Maine Place_Keyword: Atlantic Ocean Place_Keyword: Boston 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. Not to be used for navigational purposes. 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: 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 x2239 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: pvalentine@usgs.gov Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535 Data_Quality_Information: Lineage: Process_Step: Process_Description: The Terrian Ruggedness Index is based on an elevation index described by Riley and others (1999) where the sum change in elevation between a grid cell and its eight neighboring grid cells is calculated by squaring the eight differences in elevation, summing the squared differences, and taking the square root of the sum. Here, the index has been modified to calculate the average of the absolute values of the eight differences in elevation. The TRI was applied to the bathymetric grids by running a macro in ArcMap's Visual Basic editing environment. Artifacts of data collection were removed by hand editing and applying a mean filter (the Neighborhood Statistics function in Spatial Analyst was used to calculate a mean TRI for a 3x3 pixel template of TRI values centered over each pixel in the image). Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 6201 Column_Count: 3631 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Map_Projection: Map_Projection_Name: Mercator Mercator: Standard_Parallel: 41.650000 Longitude_of_Central_Meridian: -70.316667 False_Easting: 0.000000 False_Northing: 0.000000 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 13.000000 Ordinate_Resolution: 13.000000 Planar_Distance_Units: meters 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 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: 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 x2239 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: pvalentine@usgs.gov Resource_Description: Downloadable Data Distribution_Liability: Although these data have been used by the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the U.S. Geological Survey as to the accuracy of the data. 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: ARCG Transfer_Size: 85.862 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/sim/2005/2840/data/rugged/rugged.zip Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Fees: None Technical_Prerequisites: These data are available in Environmental Systems Research Institute (ESRI) ArcInfo GRID format. The user must have software capable of importing and processing the data file. Metadata_Reference_Information: Metadata_Date: 20050822 Metadata_Review_Date: 20050822 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Page C. Valentine Contact_Position: Research 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 x2239 Contact_Facsimile_Telephone: (508) 457-2310 Contact_Electronic_Mail_Address: pvalentine@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