Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2019 Title: Vineyard and Nantucket Sounds, southern coast of Cape Cod including Martha's Vineyard and Nantucket: continuous bathymetry and topography terrain model of the Massachusetts coastal zone and continental shelf, (32-bit GeoTIFF, UTM 19 NAD 83, NAVD 88 vertical datum). Edition: 2.0 Geospatial_Data_Presentation_Form: remote-sensing image Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F72806T7 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/10.5066/F72806T7 Online_Linkage: https://www.sciencebase.gov/catalog/item/5a464a6fe4b0d05ee8c05493 Larger_Work_Citation: Citation_Information: Originator: Brian D. Andrews Originator: Wayne E. Baldwin Originator: Daniel W. Sampson Originator: William C. Schwab Publication_Date: 2018 Title: Continuous bathymetry and elevation models of the Massachusetts coastal zone and continental shelf Edition: 3.0 Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/F72806T7 Publication_Information: Publication_Place: Reston, Virginia Publisher: U.S. Geological Survey Other_Citation_Details: Suggested citation: Andrews, B.D., Baldwin, W.E., Sampson, D.W., and Schwab, W.C., 2018, Continuous bathymetry and elevation models of the Massachusetts coastal zone and continental shelf (ver. 3.0, December 2019): U.S. Geological Survey data release, https://doi.org/10.5066/F72806T7. Online_Linkage: https://doi.org/10.5066/F72806T7 Online_Linkage: https://www.sciencebase.gov/catalog/item/5a451a3ce4b0d05ee8bedfdc Description: Abstract: Integrated terrain models covering 16,357 square kilometers of the Massachusetts coastal zone and offshore waters were built to provide a continuous elevation and bathymetry terrain model for ocean planning purposes. The area is divided into the following four geographical areas to reduce file size and facilitate publishing: Massachusetts Bay from the Massachusetts-New Hampshire border south to Provincetown and Scituate and east to Stellwagen Bank; Cape Cod Bay from Provincetown to Scituate and south to Hyannis; Buzzards Bay from the Cape Cod Canal southwest to the State border including the Elizabeth Islands and extending north to Fall River and Mount Hope Bay; and Nantucket and Vineyard Sounds, from Hyannis south to the border of the Massachusetts Coastal zone approximately 8 kilometers south of Nantucket. A Triangulated Irregular Network was created from public-domain bathymetric and LiDAR data using the ArcGIS terrain-model framework and then interpolated into a 32-bit GeoTiff of 10 meter resolution. The grids for each of the four geographical areas are referenced to the Universal Transverse Mercator, Zone 19, North American Datum of 1983 coordinate system, and the North American Vertical Datum of 1988. A polygon shapefile recording the source datasets accompanies each of the four grids. Purpose: Provide a continuous surface starting in the offshore waters and working inshore to the shoreward extent of the Massachusetts Coastal Zone that will be used as a regional planning framework. This model, used in conjunction with the related source dataset shapefile will also 1) Provide an inventory of the most recent elevation and bathymetry datasets within the Massachusetts Coastal Zone and offshore water, and 2) Identify areas of the offshore waters that are only covered by historical lead line soundings and should be updated using new survey methods. Supplemental_Information: This raster data set should be used with the “Ntkt_VS_Source.shp” polygon shapefile that delineates the spatial extent of each source dataset used to produce the raster. The collection date, and spatial resolution of the source data are variable and should be considered when using this raster for analysis at fine scales. The attribute table of the “Ntkt_VS_Source.shp” provides details about the collection date, and web address of the source data. Version 1.0 of this GeoTIFF did not include the source multipoint file “USGSMusk_5m_navd88” in Muskegat Channel as described in Processing Step 3. This was fixed by adding the multipoint file “USGSMusk_5m_navd88” to the Ntkt_VSTer terrain model, building the terrain model, then re-exporting to raster as described in processing step 7. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 1887 Ending_Date: 2013 Currentness_Reference: ground condition at the time of original survey. This data set is composed of data collected by different organizations at different times. Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -71.039665 East_Bounding_Coordinate: -69.668855 North_Bounding_Coordinate: 41.703016 South_Bounding_Coordinate: 41.150828 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5a464a6fe4b0d05ee8c05493 Theme: Theme_Keyword_Thesaurus: none Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Massachusetts Office of Coastal Zone Management Theme_Keyword: CZM Theme_Keyword: National Ocean Service Theme_Keyword: NOS Theme_Keyword: National Oceanic and Atmospheric Administration Theme_Keyword: NOAA Theme_Keyword: U.S. Army Corps of Engineers Theme_Keyword: USACE Theme_Keyword: Terrain Model Theme_Keyword: DEM Theme_Keyword: NOAA Theme_Keyword: LiDAR Theme_Keyword: multibeam Theme_Keyword: swath bathymetry Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: inlandWaters Theme_Keyword: elevation Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: bathymetry Theme_Keyword: sea-floor characteristics Theme_Keyword: digital elevation models Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: United States of America Place_Keyword: Commonwealth of Massachusetts Place_Keyword: Cape Cod Place_Keyword: Martha's Vineyard Place_Keyword: Nantucket Place_Keyword: Vineyard Sound Place_Keyword: Nantucket Sound Place_Keyword: Muskeget Channel Place_Keyword: Great Round Shoal Channel Place_Keyword: Cross Rip Shoal Place_Keyword: Middle Ground Temporal: Temporal_Keyword_Thesaurus: none Temporal_Keyword: 1887 Temporal_Keyword: 1938 Temporal_Keyword: 1939 Temporal_Keyword: 1942 Temporal_Keyword: 1954 Temporal_Keyword: 1956 Temporal_Keyword: 1958 Temporal_Keyword: 1960 Temporal_Keyword: 1963 Temporal_Keyword: 1964 Temporal_Keyword: 1965 Temporal_Keyword: 1966 Temporal_Keyword: 1994 Temporal_Keyword: 1998 Temporal_Keyword: 2004 Temporal_Keyword: 2007 Temporal_Keyword: 2008 Temporal_Keyword: 2009 Temporal_Keyword: 2010 Temporal_Keyword: 2011 Temporal_Keyword: 2013 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. Users are advised to read the data set's metadata thoroughly to understand appropriate use and data limitations. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Andrews Contact_Organization: U.S. Geological Survey Contact_Position: 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://www.sciencebase.gov/catalog/file/get/5a464a6fe4b0d05ee8c05493?name=Ntkt_VS_10m.jpg Browse_Graphic_File_Description: Preview image of the terrain model of Vineyard and Nantucket Sounds, southern coast of Cape Cod including Martha's Vineyard and Nantucket:. File is located in the compressed zip file. Browse_Graphic_File_Type: JPEG Data_Set_Credit: Please recognize the U.S. Geological Survey (USGS) as the source of this information. Native_Data_Set_Environment: Environment as of Metadata Creation: Microsoft [Unknown] Version 6.2 (Build 9200) Data_Quality_Information: Logical_Consistency_Report: This grid was created using a 10-meter cell resolution to reflect the finest cell resolution supported by input data of the lowest spatial resolution (historical NOS fathometer data). The boundaries of all four GeoTIFFs published in this data release are designed to overlap with adjacent grids to create a seamless surface if mosaicked together. In the areas where the GeoTIFFs overlap, the values in the overlap areas may not be the same in both terrain models. This variability can be explained by one of two reasons, or a combination of both: 1) The cell values of the raster output from the terrain model depend on the origin and extent of the bounding polygon for each original TIN (triangulated irregular network). In the areas of overlap, the cells are not necessarily coincident; therefore the input data used to assign the value to that cell are not necessarily the same. 2) A different source dataset was used as input in the generation of the terrain model for adjacent GeoTIFFs. General guidelines were established for the selection of the source elevation data, but for such a large area and complicated series of possible input datasets, the same source dataset may not have been chosen as input for adjacent terrain models in areas of overlap. Vertical differences between adjacent data sets exist in some places for two general reasons: 1) Some areas are highly dynamic over times scales that are short relative to the frequency of data acquisition. For example, around Monomoy Island (an area near Chatham, MA on the southern extent of Outer Cape Cod that is depicted in “NTK_VS_10m.tif”), where strong currents and high sediment transport rates drive continual morphologic change, high resolution LiDAR data collected along the near shore do not agree well with older soundings collected in adjacent deeper water. The boundary between data collected in different years will reflect this change in depth between adjacent datasets. 2) Differences in vertical referencing methods also cause disagreement between overlapping data. Most of the multibeam data used in this terrain model were collected and referenced to mean lower low water (MLLW) using either regional tide zone models (NOAA), or real-time kinematic tides (USGS). Although both methods for referencing data to a tidal datum are valid, small differences of 10-70 centimeters exist were these data overlap. All bathymetry referenced to tidal datums were converted to NAVD 88 vertical datum as described in Processing Step 3 and 4 below. Completeness_Report: In general, newer data of higher resolution supersedes older data of lower resolution where one or more surveys overlap. As a result, the grid does not include all data collected during all surveys if newer data exists for the same area(s). The terrain model extends sufficiently landward to seamlessly overlap other publicly available terrestrial LiDAR datasets. Data gaps in this grid exist for two general reasons: 1) LiDAR does not penetrate inland lakes and ponds, and 2) although bathymetry data may exist in small estuaries they could not be transformed to NAVD 88 because the current VDatum (v.3.6) boundary file does not cover that area. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: The horizontal accuracy of the source multibeam bathymetry (NOAA/NOS) is reported at +/- 3 meters. The horizontal accuracy of the swath bathymetry (USGS) is conservatively estimated to be +/- 10 meters. The LiDAR data were collected to meet the +/- 3-meter accuracy specification. Horizontal accuracy for lead-line and fathometer soundings are not documented. The horizontal accuracy of this composite topographic and bathymetric grid is assumed to be within 20 meters, as additional errors could have been introduced during resampling, vertical and horizontal reprojections, and interpolation. See USGS Open File Reports and NOAA survey descriptive reports using the "PubLink" in the "Ntk_VS_Source.shp" shapefile for individual survey positioning methods. Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: The vertical accuracy of the source multibeam bathymetry collected by NOAA/NOS is reported at +/- 30 to 50 cm. The vertical accuracy of the swath bathymetry collected by USGS is estimated to be +/- 10 to 60 cm. The LiDAR data were collected to meet the +/- 30-cm accuracy specification. This composite topographic and bathymetric grid is assumed to be vertically accurate to within 1-meter, as additional errors could have been introduced during resampling, vertical and horizontal reprojections, and interpolation. The vertical accuracy for NOAA lead-line and single-beam sonar soundings are not documented. NOAA survey methods and processing of sounding data are in descriptive reports. Lineage: Process_Step: Process_Description: PROCESSING STEP 1: CREATE FEATURE DATASET A feature dataset (Ntkt_VS_Terrain) was created within an ArcGIS (v. 10.3.1) file geodatabase to manage and store points and boundary polygon used to create the continuous surface. Create an empty polygon feature class that will be used as a "soft clip" boundary for the terrain model. The feature dataset and all data within it, use the Universal Transverse Mercator (UTM) Zone 19, NAD 83 coordinate system. The vertical datum for the feature dataset is the North American Vertical Datum of 1988 (NAVD 88), meters. All output files described in Steps 2-5 below were imported and stored within the "Ntk_VS_Terrain" feature dataset. This process step and all subsequent process step were performed by the same person-Brian Andrews. Process_Date: 201607 Source_Produced_Citation_Abbreviation: Ntkt_VS_Terrain (Feature DataSet) Source_Produced_Citation_Abbreviation: Ntkt_VSTerBnd (Polygon feature class) Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Andrews Contact_Organization: U.S. Geological Survey Contact_Position: 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 Process_Step: Process_Description: PROCESSING STEP 2:LiDAR Download and process LiDAR datasets using the common methods detailed below. First, the tile index in polygon shapefile format (tileindex.shp) available at the "Data URL" below was downloaded for each survey to manage the numerous LiDAR data files for each survey. The tileIndex shapefile was opened in GlobalMapper (v. 17.2.2) and all files that overlapped the terrain boundaries were downloaded using the "URL" attribute within the tileindex.shp which contains the URL (with file name) to each LiDAR file. All data were downloaded in laz format using the Geographic Coordinate System NAD 83, reviewed for point classification range, and final class codes of "Ground" or "valid bathymetric points" were used (described below in Data Source entry) to create a bare earth model. LAZ point files were converted to a grid in GlobalMapper using the Binning (Average Value) method with the "Elevation Grid "No Data" Distance Criteria" set to zero so no interpolation occurred over "no data" values such as building footprints or other non-bare earth features. The Universal Transverse Mercator, (UTM) Zone 19, NAD83, and the North American Vertical Datum of 1988 (NAVD 88) coordinate systems were specified for the Global Mapper project. The gridded data were exported from GlobalMapper as a 32-bit floating point GeoTIFF with resolutions of 5 or 10 meters depending on the area covered by the data set. For example, the 2013 USACE LiDAR survey of the Menemsha Harbor and Pond (an area on the western coast of Martha’s Vineyard depicted in “Ntkt_VS_10m.tif) was exported at 5-meter resolution to capture the detail of the relatively small area. Datasets covering larger areas (e.g. USACE 2007 Cape and Islands survey) were exported at 10-meter resolutions to provide adequate feature detail while facilitating computation of the terrain model. The resolution of each input raster dataset is identified in parentheses in the "output multipoint file" section below. Polygon outlines were created for each of the input LiDAR grids (listed below) and used to mask older or lower quality data in areas of overlap. The polygons are published in this data release in the "Ntkt_VS_Source" shapefile. See metadata of that layer for more information on the logic of the clipping operations. After addressing areas of overlap (if required), each input grid was exported to an ArcGIS Multipoint feature class for input to the terrain model. >The surveys used as sources for this and subsequent processing steps are documented below using the following format: >Data Source: Title of published dataset as listed in metadata. >Data URL: Web address to metadata. >Download Date: Date data were downloaded. >ASPRS Class used:(This only pertains to LiDAR data) LiDAR data are published using point classifications according to >standards established in the American Society of Photogrammetry and Remote Sensing (ASPRS). >Class number and description used for this grid are described. >Output Multipoint File: The name of the multipoint file used as input to the terrain >model. The resolution in meters of the GeoTIFF used to create the multipoint file is in parentheses. >Note: File size for historical NOAA singlebeam x,y, z data were small enough that they used simple point feature classes instead >of multipoint feature classes. In addition, these historical data are published as x,y,z only (not gridded), so there is no >cell resolution associated with them as other input datasets. > >Data Source: 2013-2014 U.S. Geological Survey CMGP LiDAR: Post Sandy (MA, NH, RI) >Data URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4914/2013_2014_usgs_post_sandy_ma_nh_ri_metadata.html >Download date: 201604 >ASPRS Class used: 2=Ground >Output Multipoint File:USGS2013_14LiDARCCSouth_MP_navd88 (10 m)- covers south coast of Cape Cod >Output Multipoint File: USGS2013_MV10m_MP (10 m)-covers Martha's Vineyard >Output Multipoint File: USGS2013_Ntkt10m_MP (10 m)-covers Nantcuket >Note: This survey was exported into three different multipoint files to facilitate data management. > >Data Source:2013 USACE NAE Topobathy LiDAR: Massachusetts. >Data URL:https://coast.noaa.gov/htdata/lidar1_z/geoid12b/data/4933/ma2013_usace_nae_massachusetts_m4933_metadata.html >Download Date:201604 >ASPRS Class Used: 1= unclassified, 2=Ground, 29=valid bathymetric points. >Output Multipoint File: ACOE_2013Ntkt_MP_navd88 (10 m)- covers portions of Nantucket Harbor >Output Multipoint File: ACOE_2013Men_MP_navd88 (5 m)-covers portions of Menemsha Harbor/Pond >Note: Data extent covered portions of Nantucket Harbor, and Menemsha Harbor/Pond. This survey was exported into two different multipoint files to facilitate data management. > >Data Source:2010 US Army Corps of Engineers (USACE) Joint Airborne LiDAR Bathymetry Technical Center of eXpertise (JALBTCX) Topobathy LiDAR: Northeast (MA,ME, NH, RI) >Data URL:https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/1174/2010_USACE_NE_metadata.html >Download Date:201604 >ASPRS Class Used:11=NOAA OCM Bathymetry >Output Multipoint File:ACOE_2010BathLiDAR_MP_navd88 (10 m) >Note: Elevation and bathymetry point clouds were published separately and only the bathymetry files were used from this survey. > >Data Source:2011 U.S. Geological Survey Topographic LiDAR: LiDAR for the North East >Data URL: https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/2524/ne2011_usgs_lftne_metadata.html >Download Date:201611 >ASPRS Class Used:2=Ground >Output File:USGS2011_SouthCC_10m_MP (10 M) > >Data Source:2005 - 2007 US Army Corps of Engineers (USACE) Topo/Bathy LiDAR: Maine, Massachusetts, and Rhode Island >Data URL:https://coast.noaa.gov/htdata/lidar1_z/geoid12a/data/116/2005-2007_NE_Topobathy_metadata.html >Download Date:201604 >ASPRS Class Used: class=11 "water". Used elevation files (Class=1) for Nomans Land Island only. >Output Multipoint File:ACOE2007_CAI_10m_MP (10 m) >Output Multipoint File: ACOE2007_NoMans_5m_MP (5 m) >Note: This survey was exported into two different multipoint files to facilitate data management. Process_Date: 201607 Process_Step: Process_Description: PROCESSING STEP 3: U.S. GEOLOGICAL SURVEY SWATH BATHYMETRY Swath bathymetry data from six published USGS Open-File Reports were used to compile this grid. Bathymetry data were downloaded from individual publications and processed using the common methods detailed below. Data were published using the UTM 19 WGS 84 horizontal datum, and a tidal datum of Mean Lower Low Water (MLLW). These data were transformed to UTM 19 NAD 83 horizontal datum and the North American Vertical Datum 1988 using VDatum Tool (v 3.6). Bathymetry data from USGS Open-File Report 2008-1288 were published using a local vertical datum of the Martha's Vineyard Ocean Coastal Observatory (MVCO) and later referenced to MLLW using a Zone Tidal Model from NOAA and then converted to NAVD 88 using VDatum (v. 3.6) developed by NOAA National Geodetic Survey https://vdatum.noaa.gov/. Polygon outlines were created for each of the input grids (listed below) and used to mask older or lower quality data in areas of overlap. The polygons are published in this data release in the "Ntkt_VS_Source" shapefile. See metadata of that layer for more information on the logic of the clipping operations. After addressing areas of overlap (if required), the input grids were exported to ArcGIS Multipoint feature classes for input to the terrain model. >Data Source: VS_BATH5M_V2: Revised 5 meter ArcRaster grid of bathymetry acquired using a SEA Ltd. SWATHplus-M >interferometric sonar offshore of Massachusetts within Vineyard Sound by the U.S. Geological Survey in 2009, 2010, >and 2011 (Esri BINARY GRID, >UTM 19N, WGS84). >Note: The link to the zip file (below) is provided here because the link to the zip file in metadata (above) >is incorrect. The data included in this combined grid were collected in 2009, 2010, and 2011. >Data URL (zip)https://pubs.usgs.gov/of/2012/1006/GIS/raster/bathymetry/vs_bath5m_v2.zip >Download Date:201608 >Output Multipoint File: USGS_vs5m_navd88 (5 m) > >Data Source: BATHY_2M:Bathymetric data collected by the U.S. Geological Survey off the southern shore of Martha's >Vineyard, MA, 2007 (ESRI BINARY GRID). Note: Although data were published using a 2-m resolution, the original data >files in CARIS HIPS format were accessed and regridded using a 5-m resolution for use in this merged grid. >Data URL:https://pubs.usgs.gov/of/2008/1288/GIS_catalog/Bathy/bathy_2m.html >Download Date:201608 >Output Multipoint File:MVCO_5mMP_navd88 >Note: Data were converted from local MVCO datum to MLLW using a Zone Tidal Model from NOAA. Then MLLW grid was converted to NAVD 88 using Vdatum (v 3.6). > >Data Source: survey1_2m: Swath bathymetry gridded data (survey 1) collected by the U.S. Geological Survey surrounding Muskeget Channel, >MA, October 2010 (Esri grid, UTM Zone 19N, WGS 84, 2-m resolution) >Data URL: https://pubs.usgs.gov/of/2012/1258/GIS_catalog/bathy/Survey1/survey1_2m.html >Download Date: 20160816 >Output Multipoint File: USGSMusk_5m_navd88 >Note: Data were published as 2-m grid, and aggregated to 5-m before converting to a multipoint file. > >Data Source: allswathi_5m: Composite swath bathymetry gridded data collected by the U.S. Geological Survey surrounding >the eastern Elizabeth Islands and northern Martha's Vineyard, MA, 2011 (Esri grid, UTM Zone19 N, WGS 84, 5-m resolution) >Data Url:https://pubs.usgs.gov/of/2013/1020/GIS_catalog/bathy/all/allswathi_5m.html >Download Date:20160824 >Output Multipoint File:USGS2013_1020_5mMPnavd88_h >Note: Data collected around the Elizabeth Islands were not included in this grid, and are included in the Buzzards Bay Terrain Model. > >Data Source: 2013-003-FA_Bath5m.tif: 5-meter bathymetric data collected in 2013 by the U.S. Geological Survey south of Martha's Vineyard and north of Nantucket, Massachusetts (32-bit floating-point bathymetry GeoTIFF and depth-colored hillshaded GeoTIFF, UTM Zone 19N, WGS 84) >Data URL: https://pubs.usgs.gov/of/2016/1168/GIS_catalog/raster/bathy/2013-003-FA_Bath5m_MLLW_meta.html >Download Date: 20161101 >Output Multipoint File: USGS_003_5m_MP_navd88 > >Data Source: CAPESOUTH_GEO4M_XYZ.TXT: ASCII formatted file of the 4-m bathymetry from the southern half of USGS Survey 98015 of the Sea Floor off Eastern Cape Cod (Geographic) >Data URL:https://pubs.usgs.gov/of/2005/1048/data/bathymetry/grid/capesouth_geo4m_xyz.htm >Download Date: 20161101 >Output Multipoint File:USGS_OFR1048_5m_MP_navd88 >Note: x,y,z file was reprojected to UTM Zone 19 with the output cell size set to 5 meters, then exported as an ascii text for conversion in VDatum. Process_Date: 201611 Process_Step: Process_Description: PROCESSING STEP 4: NOAA BATHYMETRY Data were downloaded from NOAA National Center for Environmental Information (NCEI)and processed as described below. Most NOAA multibeam data accessed for this grid are published using the UTM Zone 19, NAD 83 coordinate system and the Mean Lower Low Water (MLLW) tidal datum. Most historical sounding data (fathometer, singlebeam) data accessed for this grid are published in x,y,z format using a Geographic coordinate system (lat,lon) in the NAD 83 horizontal datum and a mean low water (MLW) or mean lower low water (MLLW) tidal datum. Data were transformed into the UTM, Zone 19 NAD 83 coordinate system (if required), and the NAVD 88 vertical datum using VDatum Tool (v 3.6). A point feature class ("SurveyName"_navd88) was created for each survey along with an associated boundary polygon ("SurveyName"_Mask) encompassing the soundings. The boundary polygon was clipped to remove soundings in areas that overlapped with newer multibeam or bathymetric LiDAR data. During the clipping operation a 50 to a 100 meter buffer was applied to create space between the older sparse echosounder data, and the new higher resolution data. This 50 to 100-meter distance between the different data densities, creates a gradual transition in the terrain model and improves the quality of the final 10-meter grid by smoothing transitions between datasets. > >Data Source: H01802 >Data URL: https://www.ngdc.noaa.gov/nos/H00001-H02000/H01802.html >Collection Date: 1887 >Collection Method: unknown >Download Date: 200906 >Output file: H01802_navd88 > >Data Source: H06349 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06349.html >Collection Date:1938 >Collection Method: Hand lead line >Download Date: 200906 >Output file: H06349_navd88 > >Data Source: H06471 >Data URL:https://www.ngdc.noaa.gov/nos/H06001-H08000/H06471.html >Collection Date: 1939 >Collection Method: Hand lead line >Download Date:200906 >Output file: H06471_navd88 > >Data Source: H06534 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06534.html >Collection Date: 1939 >Collection Method: Fathometer >Download Date: 200906 >Output file: H06471_navd88 > >Data Source: H06472 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06472.html >Collection Date: 1939 >Collection Method: Hand lead line >Download Date: 200906 >Output file: H06472_navd88 > >Data Source: H06445 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06445.html >Collection Date: 1939 >Collection Method: Fathometer >Download Date: 200906 >Output file: H06472_navd88 > >Data Source: H06468 >Data URL:https://www.ngdc.noaa.gov/nos/H06001-H08000/H06468.html >Collection Date: 1942 >Collection Method: Fathometer >Download Date: 200906 >Output file: H06469_navd88 > >Data Source: H06469 >Data URL:https://www.ngdc.noaa.gov/nos/H06001-H08000/H06469.html >Collection Date: 1939 >Collection Method:Hand lead line >Download Date:200906 >Output file:H06469_navd88 > >Data Source: H06533 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06533.html >Collection Date: 1939 >Collection Method: Fathometer >Download Date: 200906 >Output file: H06533_navd88 > >Data Source: H06534 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06534.html >Collection Date: 1939 >Collection Method: Fathometer >Download Date: 200906 >Output file: H06534_navd88 > >Data Source: H08171 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08171.html >Collection Date: 1954 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08171_navd88 > >Data Source: H08172 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08172.html >Collection Date: 1954 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08172_navd88 > >Data Source: H08449 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08449.html >Collection Date: 1958 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08449_navd88 > >Data Source: H08450 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08450.html >Collection Date: 1957 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08450_navd88 > >Data Source: H08497 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08497.html >Collection Date: 1958 >Collection Method:Fathometer >Download Date: 200906 >Output file: H08497_navd88 > >Data Source: H08631 >Data URL:https://www.ngdc.noaa.gov/nos/H08001-H10000/H08631.html >Collection Date: 1960 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08631_navd88 > >Data Source: H08760 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08760.html >Collection Date: 1963 >Collection Method:Fathometer >Download Date: 200906 >Output file: H08760_navd88 > >Data Source: H08761 >Data URL:https://www.ngdc.noaa.gov/nos/H08001-H10000/H08761.html >Collection Date: 1963 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08761_navd88 > >Data Source: H08820 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08820.html >Collection Date: 1964 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08820_navd88 > >Data Source: H08821 >Data URL:https://www.ngdc.noaa.gov/nos/H08001-H10000/H08821.html >Collection Date: 1964 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08821_navd88 > >Data Source: H08845 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08845.html >Collection Date: 1964 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08845_navd88 > >Data Source: H08846 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08846.html >Collection Date: 1964 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08846_navd88 > >Data Source: H06446 >Data URL: https://www.ngdc.noaa.gov/nos/H06001-H08000/H06446.html >Collection Date: 1939 >Collection Method: Fathometer >Download Date: 201610 >Output file: H06446_navd88 > >Data Source: H08902 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08902.html >Collection Date: 1966 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08902_navd88 > >Data Source: H08903 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08903.html >Collection Date: 1966 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08903_navd88 > >Data Source: H08905 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08905.html >Collection Date: 1966 >Collection Method: Fathometer >Download Date: 200906 >Output file: H08905_navd88 > >Data Source: H10498 >Data URL: https://www.ngdc.noaa.gov/nos/H10001-H12000/H10498.html >Collection Date: 1993 >Collection Method: Fathometer >Download Date: 200906 >Output file: H10498_navd88 > >Data Source: H10547 >Data URL: https://www.ngdc.noaa.gov/nos/H10001-H12000/H10547.html >Collection Date: 1994 >Collection Method: Fathometer >Download Date: 200906 >Output file: H10498_navd88 > MULTIBEAM STARTS HERE >Data Source: H12007 >Data URL: https://www.ngdc.noaa.gov/nos/H12001-H14000/H12007.html >Collection Date: 2009 >Collection Method: Multibeam >Download Date: 201609 >Output file: H12007_navd88 > >Data Source: H11920 >Data URL: https://www.ngdc.noaa.gov/nos/H10001-H12000/H11920.html >Collection Date: 2008 >Collection Method: Multibeam >Download Date: 201609 >Output file: H11920_navd88 > >Data Source: H11079 >Data URL: https://www.ngdc.noaa.gov/nos/H10001-H12000/H11079.html >Collection Date: 2004 >Collection Method: Multibeam >Download Date: 201609 >Output file: H11079_navd88 > >Data Source: H11346 >Data URL: https://www.ngdc.noaa.gov/nos/H10001-H12000/H11346.html >Collection Date: 2004 >Collection Method: Multibeam >Download Date: 201609 >Output file: H11346_navd88 >Note: This is a combined multibeam and singlebeam sonar survey. Gaps exist of 50-60 meters between adjacent singlebeam lines. See Data url above for figure of data coverage. > >Data Source: H08349 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08349.html >Collection Date: 1956 >Collection Method: Fathometer >Download Date: 201612 >Output file: H08349_navd88 > >Data Source: H08350 >Data URL: https://www.ngdc.noaa.gov/nos/H08001-H10000/H08350.html >Collection Date: 1956 >Collection Method: Fathometer >Download Date: 201612 >Output file: H08350_navd88 Process_Date: 201609 Process_Step: Process_Description: PROCESSING STEP 5: APPEND POLYGON SURVEYMASK BOUNDARIES TO TERRAINBND. A polygon boundary was created as a "soft clip" during the terrain building process by appending all the "SurveyName"_Mask polygons to the "Ntkt_VS_TerBnd" feature class created in STEP 1 above. The Ntkt_VS_TerBnd feature class was reviewed and edited as needed to fill gaps between adjacent mask polygons, or fill no data holes within the LiDAR data produced from using only ground or valid bathymetry points in the input LiDAR laz files. Gaps within, and between, bathymetric mask polygons were filled if the adjacent data supported interpolating across the no data gap. For example, the gaps between adjacent lines from NOAA Survey H12642 at the entrance to New Bedford Harbor were filled in because A) the gaps between adjacent lines were small (30-40 meters), and B) The adjacent data was new high resolution multibeam data. Gaps remain onshore in lakes, ponds, or small steams where terrestrial LiDAR did not penetrate. Gaps remain in the bathymetry in areas not covered by the VDatum boundary. Process_Date: 201611 Source_Produced_Citation_Abbreviation: Ntkt_VS_TerBnd Process_Step: Process_Description: PROCESSING STEP 6: CREATE TERRAIN. An ArcGIS (v. 10.3.1) Terrain (VS_Ntkt_VSTer) was created within the Ntkt_VS_Terrain feature dataset created in step 1 using the context menu in ArcCatalog (v. 10.3.1) and the following parameters: average point spacing = 10 meters, pyramid type = Z Tolerance. One Terrain pyramid level of Tolerance 1 was used as a thinning routine to facilitate faster redraw times when working with the Terrain (TIN). During the build process the "Ntkt_VS_TerBnd" created in Step 6 was used as a "soft clip" to delineate the data boundaries. Process_Date: 201710 Source_Produced_Citation_Abbreviation: Ntkt_VSTer Process_Step: Process_Description: PROCESSING STEP 7: CONVERT TERRAIN TO RASTER. The terrain (Ntkt_VSTer) was converted to a 32-bit GeoTIFF (Ntkt_VS_10m_V2.tif) using the "Convert Terrain to Raster" tool in ArcGIS (v. 10.3.1), specifying the Natural Neighbors method and a cell size of 10 meters. During the conversion process a pyramid level of zero was selected so that all the points were used to create the raster. Source_Used_Citation_Abbreviation: Ntkt_VSTer Process_Date: 201910 Source_Produced_Citation_Abbreviation: Ntkt_VS_10m_V2.tif Process_Step: Process_Description: Added keywords section with USGS persistent identifier as theme keyword. Process_Date: 20200807 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: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 5955 Column_Count: 11364 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: 10.000000 Ordinate_Resolution: 10.000000 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_NAD_1983_2011 Ellipsoid_Name: Geodetic Reference System 80 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257222101 Vertical_Coordinate_System_Definition: Altitude_System_Definition: Altitude_Datum_Name: North_American_Vertical_Datum_1988 Altitude_Resolution: 1.0 Altitude_Distance_Units: Meter Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates Entity_and_Attribute_Information: Overview_Description: Entity_and_Attribute_Overview: Elevation values in Esri 32-bit GeoTIFF format. Data values represent elevations above, and depths below the North American Vertical Datum of 1988 (NAVD 88) Entity_and_Attribute_Detail_Citation: Esri Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey-ScienceBase Contact_Address: Address_Type: mailing and physical address Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: Ntkt_VS_10m_V2.tif: file contains the 32-bit GeoTIFF (Ntkt_VS_10m_V2.tif), TIFF world file (Ntkt_VS_10m_V2.tfw), Ntkt_VS_10m.jpg browse graphic, and the associated FGDC CSDGM metadata in XML, HTML, FAQ, and text formats. 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 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: GeoTIFF Format_Version_Number: ArcGIS (v. 10.3.1) Format_Specification: GeoTIFF image Format_Information_Content: This WinZip file contains the 32-bit floating point GeoTIFF, and associated metadata for the terrain model of Nantucket and Vineyard Sounds File_Decompression_Technique: WinZip Transfer_Size: 165 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/5a464a6fe4b0d05ee8c05493?name=Ntkt_VS_10m.zip Network_Resource_Name: https://www.sciencebase.gov/catalog/item/5a464a6fe4b0d05ee8c05493 Access_Instructions: The network resources offer the options of downloading the individual files, or accessing the landing page of the data release. Fees: None Technical_Prerequisites: To utilize this data, the user must have software capable of reading a 32-bit GeoTIFF. Metadata_Reference_Information: Metadata_Date: 20200807 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Brian Andrews Contact_Organization: U.S. Geological Survey, Northeast Region Contact_Position: Geographer Contact_Address: Address_Type: mailing address Address: 384 Woods Hole Road City: Woods Hole State_or_Province: MA Postal_Code: 02543 Contact_Voice_Telephone: 508-548-8700 ext. 2348 Contact_Electronic_Mail_Address: bandrews@usgs.gov Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998