Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 2010 Title: DH_bathy5m: Bathymetric data collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration offshore of Massachusetts between Duxbury and Hull (ESRI BINARY GRID) Edition: 1.0 Geospatial_Data_Presentation_Form: raster digital data Series_Information: Series_Name: Open-File Report Issue_Identification: 2009-1072 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathy5m.zip Online_Linkage: http://pubs.usgs.gov/of/2009/1072/html/appendix1.html Larger_Work_Citation: Citation_Information: Originator: Walter A. Barnhardt Originator: Seth D. Ackerman Originator: Brian D. Andrews Originator: Wayne E. Baldwin Publication_Date: 2010 Title: Geophysical and Sampling Data from the Inner Continental Shelf: Duxbury to Hull, Massachusetts. Edition: 1.0 Series_Information: Series_Name: Open-File Report Issue_Identification: 2009-1072 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, Massachusetts Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2009/1072/ Description: Abstract: These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Science Center (WHSC). 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 sea-floor geology are important first steps toward protecting fish habitat, delineating marine resources, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters (5-30 m deep) of Massachusetts between the New Hampshire border and Cape Cod Bay. Data collected for the mapping cooperative have been released in a series of USGS Open-File Reports (http://woodshole.er.usgs.gov/project-pages/coastal_mass/html/current_map.html). This spatial dataset is from the study area located between Duxbury and Hull Massachusetts, and consists of high-resolution geophysics (bathymetry, backscatter intensity, and seismic reflection) and ground validation (sediment samples, video tracklines and bottom photographs). The data were collected during four separate surveys conducted between 2003 and 2007 (NOAA survey H10993 in 2003, USGS-WHSC survey 06012 in 2006, and USGS-WHSC surveys 07001 and 07003 in 2007) and cover more than 200 square kilometers of the inner continental shelf. Purpose: This grid represents approximately 200 square kilometer of bathymetric data that were collected in 2003, 2006 and 2007. This is a merged grid of interferometric (Systems Engineering and Assessment Ltd. SWATHPlus-M) and multibeam (RESON SeaBat 8101 and 8125) bathymetric sonar data that were collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration, respectively, during three surveys (NOAA survey H10993 and USGS surveys 06012 and 07001) offshore of Massachusetts, between Duxbury and Hull. These data are used to define the sea-floor morphology as part of the Massachusetts Sea-floor Mapping Project. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20030820; 20060804; 20070422 Ending_Date: 20031003; 20060820; 20070502 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -70.829915 East_Bounding_Coordinate: -70.596158 North_Bounding_Coordinate: 42.346323 South_Bounding_Coordinate: 42.077031 Keywords: Theme: Theme_Keyword_Thesaurus: General Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Geology Program Theme_Keyword: CMGP Theme_Keyword: Woods Hole Science Center Theme_Keyword: WHSC Theme_Keyword: Seafloor Theme_Keyword: Marine Geology Theme_Keyword: NOAA hydrographic survey registry number H10993 Theme_Keyword: WHSC field activity serial number 06012 Theme_Keyword: WHSC field activity serial number 07001 Theme_Keyword: bathymetry Theme_Keyword: swath bathymetry Theme_Keyword: interferometry Theme_Keyword: multibeam bathymetry Theme_Keyword: SEA SWATHPlus Theme_Keyword: SEA Submetrix Theme_Keyword: RESON 8101 Theme_Keyword: RESON 8125 Theme_Keyword: R/V Megan T. Miller Theme_Keyword: R/V Rafael Theme_Keyword: NOAA Ship Thomas Jefferson Theme_Keyword: NOAA Launch 1005 Theme_Keyword: NOAA Launch 1014 Theme_Keyword: ArcRaster grid Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: oceans and coastal Theme_Keyword: oceans and estuaries Theme_Keyword: elevation Theme_Keyword: imageryBaseMapsEarthCover Theme_Keyword: geoscientificInformation Place: Place_Keyword_Thesaurus: General Place_Keyword: North America Place_Keyword: United States Place_Keyword: Atlantic Ocean Place_Keyword: Massachusetts Place_Keyword: Boston South Shore Place_Keyword: Massachusetts Bay Place_Keyword: Cape Cod Bay Place_Keyword: Nantasket Beach Place_Keyword: Hull Bay Place_Keyword: Scituate Place_Keyword: Marshfield Place_Keyword: Brant Rock Place_Keyword: Duxbury Beach Place_Keyword: Duxbury Bay Temporal: Temporal_Keyword_Thesaurus: General Temporal_Keyword: 2003 Temporal_Keyword: 2006 Temporal_Keyword: 2007 Access_Constraints: None Use_Constraints: These data are NOT to be used for navigation. Mariners should refer to the appropriate nautical chart. 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 originator of the dataset. Browse_Graphic: Browse_Graphic_File_Name: http://pubs.usgs.gov/of/2009/1072/GIS/browse_jpg/big/DH_bathy5m.jpg Browse_Graphic_File_Description: Depth-colored image of bathymetry Browse_Graphic_File_Type: JPEG Native_Data_Set_Environment: Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.1.1850 Cross_Reference: Citation_Information: Originator: Walter A. Barnhardt Originator: Brian D. Andrews Originator: Bradford Butman Publication_Date: 2006 Title: High-Resolution Mapping of the Inner Continental Shelf: Nahant to Gloucester, Massachusetts Series_Information: Series_Name: Open-File Report Issue_Identification: 2005-1293 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2005/1293/ Cross_Reference: Citation_Information: Originator: Seth D. Ackerman Originator: Bradford Butman Originator: Walter A. Barnhardt Originator: William W. Danforth Originator: James M. Crocker Publication_Date: 2006 Title: High-Resolution Geologic Mapping of the Inner Continental Shelf: Boston Harbor and Approaches, Massachusetts Series_Information: Series_Name: Open-File Report Issue_Identification: 2006-1008 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2006/1008/ Cross_Reference: Citation_Information: Originator: Walter A. Barnhardt Originator: Brian D. Andrews Originator: Seth D. Ackerman Originator: Wayne E. Baldwin Originator: Christopher J. Hein Publication_Date: 2009 Title: High-Resolution Geological Mapping of the Inner Continental Shelf: Cape Ann to Salisbury Beach, Massachusetts Series_Information: Series_Name: Open-File Report Issue_Identification: 2007-1373 Publication_Information: Publication_Place: Woods Hole Science Center, Woods Hole, MA Publisher: U.S. Geological Survey, Coastal and Marine Geology Program Online_Linkage: http://pubs.usgs.gov/of/2007/1373/ Cross_Reference: Citation_Information: Originator: NOAA (National Oceanic and Atmospheric Administration) Publication_Date: 2003 Title: Data Acquisition and Process Report - NOAA Ship Thomas Jefferson (August - November 2003) Series_Information: Series_Name: Data Acquisition and Process Report (DAPR) Issue_Identification: NOAA Ship Thomas Jefferson (August - November 2003) Publication_Information: Publication_Place: National Geophysical Data Center, Boulder, CO Publisher: National Oceanic and Atmospheric Administration, National Geophysical Data Center (NGDC) Online_Linkage: http://surveys.ngdc.noaa.gov/mgg/NOS/DAPRs/NOAAShipTHOMASJEFFERSONAugNov2003.pdf Cross_Reference: Citation_Information: Originator: NOAA (National Oceanic and Atmospheric Administration) Publication_Date: 2003 Title: Descriptive Report, Basic Hydrographic Survey H10993, Approaches to Boston Harbor, Massachusetts Bay, Massachusetts Series_Information: Series_Name: Descriptive Report (DR) Issue_Identification: H10993 Publication_Information: Publication_Place: National Geophysical Data Center, Boulder, CO Publisher: National Oceanic and Atmospheric Administration, National Geophysical Data Center (NGDC) Online_Linkage: http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H10993/DR/H10993.pdf Data_Quality_Information: Logical_Consistency_Report: This grid represents interpolated data; processed to account for gaps that occurred along-track and between adjacent lines. Completeness_Report: All quality main survey line bathymetric data (generally shore parallel for the USGS surveys) that were collected within the Duxbury to Hull survey area were incorporated in this grid. Approximately 125 square-km of additional bathymetric data collected south of Brant Rock, Massachusetts during these field activities will be published in a subsequent data release focused on Cape Cod Bay. Soundings from the USGS surveys were processed and edited using Computer Aided Resource Information System (CARIS) Hydrographic Information Processing System (HIPS; ver. 6.1). Although the soundings were manually edited, small data spikes may exist at outer edges of some swaths. In addition, small gaps between adjacent survey lines may exist in depth less than 14 meters. Tielines (generally shore perpendicular) were not used in grid generation but used to verify tide corrections during post-processing. NOAA's CARIS directory for survey H10993 was provided to the USGS. No additional swath processing or navigation editing was performed to the NOAA data in CARIS. The GPS navigation and bathymetric attitude data were significantly hindered during the first leg of survey 06012 (lines l1f1 - l99f2, 4-14 Aug 2006). Navigation dropouts halted surveying and problems with the ADU2 compass resulted in un-usable bathymetric data along survey tracklines that have valid navigation. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: Hydrographic survey H10993: Horizontal sounding positional control for the NOAA H10993 survey was determined using the Global Positioning System (GPS) corrected by U.S. Coast Guard Differential GPS (DGPS) beacon stations. The primary and only DGPS beacon used for survey H10993 was Portsmouth Harbor, NH (Beacon No. 771). No horizontal control stations were established for the NOAA survey. Additional information may be found in the NOAA Descriptive Report for survey H10993, the Data Acquisition and Processing Report, and the Horizontal and Vertical Control Report. Field activity 06012: The SWATHPlus transducers were mounted on a rigid pole, approximately 2.6 m below the water line, along the starboard side of the R/V Megan T. Miller. Position data were provided by the Z-Surveyor Extreme for real-time kinematic (RTK) navigation (the Ashtech BR2G DGPS was used as a backup navigation system) and recorded to the raw data files (SXR) via SWATHPlus (version 2.07) on the acquisition computer. During some portions of the survey, technical difficulties caused the GPS systems to malfunction; in some instances the acquisition systems fell back on the DGPS navigation; but in some cases surveying was halted until a reliable GPS signal could be achieved. A conservative estimate of positional accuracy is estimated to be 10 m although when the system was recording RTK navigation the positional accuracy may be <1 m as RTK-GPS provides horizontal positional accuracies on the decimeter scale (http://www.noaa.gov; http://www.nos.noaa.gov; http://www.ngs.noaa.gov). Field activity 07001: The SWATHPlus transducers were mounted on a rigid pole, approximately 0.5 m below the water line, from the bow of the of the R/V Rafael of Woods Hole, MA. Position data were provided by the Ashtech Extreme for real-time kinematic (RTK) navigation (the Ashtech BR2G Differential Global Positioning System (DGPS) was used as a backup navigation system) and recorded to the raw data files (SXR) via SWATHPlus (version 3.X) on the acquisition computer. A conservative estimate of positional accuracy is estimated to be 10 m although when the system was recording RTK navigation the positional accuracy may be <1 m as RTK-GPS provides horizontal positional accuracies on the decimeter scale (http://www.noaa.gov; http://www.nos.noaa.gov; http://www.ngs.noaa.gov). Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: NOAA Hydrographic survey H10993: NOAA's National Ocean Service Hydrographic Surveys Specifications and Deliverables closely follow the International Hydrographic Organizations Standards for Hydrographic Surveys, Special Publication 44, Fifth Edition, February 2008, specifically for Order 1 surveys. Positioning and attitude on Launch 1005 were determined with a TSS POS/MV 320 (version 2) GPS aided inertial navigation system. Positioning and attitudes on Launch 1014 were determined with a TSS POS/MV 320 (version 3) GPS-aided inertial navigation system. Launch 1014 also used a Digibar Pro to measure surface sound velocity and achieve continuous refraction correctors at the transducer. The tidal datum for survey H10993 is Mean Lower Low Water (MLLW). The operating tide station at Boston, MA(844-3970) served as control for datum determination. Observed tide files were e-mailed by TideBot daily during acquisition and applied to all sounding data using preliminary zoning. Final zoning was received and applied with observed water levels. The verified water level data was received and was compared to the observed data. No difference between these verified and observed water level data were notice. Verified tides using final tide zoning were re-applied by NOAA's Atlantic Hydrographic Branch during post-processing. Refer to the Fall Data Acquisition and Processing Report (DAPR) and the Horizontal and Vertical Control Report, for detailed equipment, vessel configuration and setting information. USGS field activities 06012 and 07001: Vertical accuracy of the raw data based on system specifications may approximate 1% of water depth, 0.10.4 meters within the survey area. However, overall vertical accuracies on the order of 0.5 m or more are assumed based on the following considerations. In 2006, ship motion was recorded with a TSS DMS 2-05, used to correct for vessel roll, pitch, heave, and yaw. In 2007, the Octopus F180 Attitude and Positioning system was used to correct ship motion. RTK-GPS was used to establish water-level heights relative to Mean Lower Low Water (MLLW), providing decimeter-scale accuracies. Tide-correction was done in post-processing (see process steps). Refraction artifacts were minimized by acquiring a range of sound velocity profiles throughout the survey area to model the sound velocity structure of the water column. Changes in vessel draft due to fuel and water usage were not considered. Lineage: Source_Information: Source_Citation: Citation_Information: Originator: U.S. Geological Survey Type_of_Source_Media: disc Source_Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20030820; 20060804; 20070422 Ending_Date: 20031003; 20060820; 20070502 Source_Currentness_Reference: ground condition Source_Contribution: For USGS field activities 06102 and 07001: Bathymetry data were acquired with a Systems Engineering and Assessment Ltd. (SEA) SWATHPlus 234 kHz interferometric sonar. Survey lines were run at an average speed of 5 knots and were spaced 100 m apart to obtain overlapping swaths of data and full coverage of the seafloor. During USGS field activity 06012, the transducers were mounted on a rigid pole on the starboard side of the RV Megan Miller, about 2.6 m below the waterline. A TSS DMS 2-05 motion reference unit was mounted directly above the sonar transducers and continuously recorded vessel position and attitude data. Heading was determined using an Ashtech ADU2 for lines l1f1-l99f1, and a KVH compass (with processor calculated declination +15.583 to be applied during post-processing) for lines l99f2-end of survey. During USGS field activity 07001, the transducers were mounted on a rigid pole on the bow of the RV Rafael, about 0.5 m below the waterline. A CodaOctopus F-180 inertial-motion unit, mounted directly above the transducers, measured vertical displacement (heave) and attitude (pitch and roll) of the vessel during acquisition. Navigation was based on a Real-Time Kinematic Global Positioning System (RTK-GPS); the RTK-GPS antenna was mounted directly above the interferometric sonar head. The RTK-corrected GPS signal was sent to the ship from a base station established by the USGS on land. Horizontal (x and y) and vertical (z) offsets between the transducers and motion sensor and antenna and motion sensor were precisely measured and recorded within the SWATHPlus acquisition software (SEA Swath Processor (2005)). These offsets are used to establish the motion sensor as the common reference point for data acquisition. Additionally, the depth of the transducers below the water surface was measured and recorded within the SEA Swath Processor acquisition software. This depth was used to derive the speed of sound profile and acoustic ray path based on speed of sound profiles collected within the survey area. Sound-velocity profiles were collected approximately every 2 hours by a hand-casted Applied MicroSystems SV Plus sound velocimeter. During post-processing, soundings were referenced to local MLLW by using orthometric to chart datum offsets obtained from NOAA Tidal Station #8446009 at Brant Rock Harbor, Massachusetts. Data were processed and gridded by using the SEA SWATHPlus Swath Processor (version 10.0) CARIS Hydrographic Information Processing System (HIPS version 6.1). For NOAA Hydrographic survey H10993: Launch 1005 acquired multibeam-echosounder data using a hull-mounted RESON SeaBat 8101 multibeam system. All positioning and attitude on Launch 1005 were determined with a TSS POS/MV 320 (version 2) GPS aided inertial navigation system. Launch 1014 acquired multibeam-echosounder data using a RESON SeaBat 8125 multibeam system. For continuous refraction correctors at the transducer, a Digibar Pro was used for the surface sound velocity and all positioning and attitudes on Launch 1014 were determined with a TSS POS/MV 320 (version 3) GPS-aided inertial navigation system. The RESON SeaBat 8101 is a 1.5 degree beam angle system which operates at a frequency of 240 kHz and collects 101 individual soundings in a swath oriented perpendicular to the vessel track. The RESON SeaBat 8125 is a 0.5 degree beam angle system which operates at a frequency of 455 kHz and collects 240 individual soundings in a swath oriented perpendicular to the vessel track. Sounding positional control was determined using the Global Positioning System (GPS) corrected by U.S. Coast Guard Differential GPS (DGPS) beacon stations. The primary and only DGPS beacon used for this survey was Portsmouth Harbor, NH (Beacon # 771). No horizontal control stations were established for this survey. All bathymetry processing, including tide-correction (based on final zone tidal models), were done by NOAA Hydrographers. NOAA's Computer Aided Resource Information System (CARIS) directory was provided to the USGS. Refer to the Fall Data Acquisition and Processing Report (DAPR) and the Horizontal and Vertical Control Report, for detailed equipment, vessel configuration and setting information. Process_Step: Process_Description: Prepare tide correction data for field activity 06012 and 07001: Depths were corrected to Mean Lower Low Water (MLLW) using 1 second RTK-GPS heights of the GPS receiver mounted over the SWATHPlus sonar head. These heights were extracted from each HYPACK navigation file using the AWK script "doRTK1_by_line_FIX" and smoothed in MATLAB (version 7.20.232 R2006a) using a third order polynomial. The smoothed 1 second heights were averaged to 1 minute heights and formatted for input to Swath Processor using the AWK script "DoRTK2". The resulting ASCII text file was then reformatted to comply with the format (HH:MM DD/MM/YYYY TTTTT.TTT) needed in the tide table in the SEA Swath Processor session file (sxs). During the next step the tide data is merged into the bathymetric soundings data during the conversion of SWATHPlus raw (sxr) files to SWATHPlus processed (sxp) files. Process_Date: 2006; 2007; 2008 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: Raw to Processed conversion for USGS field activity 06012 and 07001: Each raw SWATHPlus bathymetric sonar file (sxr) was converted to a SWATHPlus processed file (sxp) using SEA SWATHPlus Swath Processor (ver. 3.05.19.0). During the conversion process, sound velocity profiles were used to minimize potential refraction artifacts from fluctuations in the speed of sound within the water column. Various bathymetric filters were applied to eliminate sounding outliers. During this conversion process the tidal information from the previous process step was merged into the new processed file (sxp). The filters in Swath Processor greatly reduced the appearance of an artifact observed in the port side of the bathymetric data from survey 06012; probably the result of a multi-pathing sound wave off the hull of the survey vessel. Although minimized, this artifact may still give the final bathymetry grid a stripy appearance, especially in areas of little local relief. Process_Date: 2008 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: CARIS processing for USGS field activity 06012 and 07001: A new CARIS HIPS project (ver. 6.1) was created with for each field activity with projection information set to Universal Transverse Mercator (UTM) Zone 19, WGS84. Each SWATHPlus processed file (sxp) was imported to the new CARIS project using the Import/Conversion Wizard. A 5 meter resolution Bathymetric and Statistical Error (BASE) Surface was created from the files for each Julian day. The BASE surface for each day was reviewed for any inconsistencies or data anomalies. Navigation was edited as needed using the navigation editor tool in CARIS. Filters were applied to each line including beam to beam slopes and across track angle. The CARIS refraction editor was used to adjust the speed of sound in cases where the velocimeter did not provide adequate correction to flatten out the depth profiles produced by localized variations in speed of sound through the water column. CARIS processing for NOAA hydrographic survey H10993: The CARIS HIPS directory was received from the National Oceanic and Atmospheric Administration - National Geophysical Data Center (NOAA-NGDC). The multibeam bathymetric data from NOAA was delivered fully processed and tide-corrected by NOAA Hydrographers. The CARIS HIPS project was reviewed and checked for any inconsistencies. Survey lines outside of the Duxbury to Hull survey area were removed from the project. Process_Date: 2008; 2009 Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: BASE surface creation for USGS field activity 06012 and 07001: A new CARIS HIPS project was made to create final BASE surfaces for all of the bathymetric data from the NOAA and USGS surveys. A 5 meter BASE surface was created for the entire area of the Duxbury to Hull survey area utilizing all the quality bathymetric soundings data from USGS surveys 06012 and 07001. This surface demonstrates the data gaps especially those resulting from navigation problems during survey 06012 and gaps between survey lines in shallow water during survey 07001. Another 10 meter BASE surface (with 4 iterations of interpolation) was created from the same data from survey 06012 and 07001 in order to fill the data gaps (these two grids will be merged using a technique that preserves the higher-resolution data - see next process step). BASE surface creation for NOAA hydrographic survey H10993: A 5 meter BASE surface (with 1 iteration of interpolation) was created for the NOAA hydrographic data using all quality bathymetric soundings data within the Duxbury to Hull survey area. Process_Date: 20090624 Source_Produced_Citation_Abbreviation: CARIS HIPS BASE surfaces (June24_5m.hns, June24_10m_Interp4.hns, H10993_5m_Interp.hns) Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: The CARIS HIPS BASE surfaces for the USGS 5 meter grid, USGS 10 meter grid, and NOAA 5 meter grid (June24_5m.hns, June24_10m_Interp4.hns, and H10993_5m_Interp.hns respectively) were converted to IVS Fledermaus Digital Terrain Models (DTM) using Interactive Visualization Systems (IVS 3D) Data Magician (DMagic, version 6.7); [Import Gridded Data - from CARIS BASE surface]. Three DTM files with the same filenames were created. The USGS 5 meter and 10 meter grids were combined using IVS 3D Fledermaus Commander (FMCommand) and the tool "dtmmerge" (highres setting preserves the higher-resolution data and fills the gaps with data from the lower resolution DTM; outputfile: 5 meter grid usgs_combined_temp.dtm). The resulting DTM was then combined with the 5 meter NOAA DTM using the same method (outputfile: June24_ALL_new.dtm). In IVS 3D DMagic, the grid June24_ALL_new.dtm was exported to ARC/INFO ASCII GRID format (outputfile: June24_ALL_new.asc). Process_Date: 20090624 Source_Produced_Citation_Abbreviation: IVS 3D Digital Terrain Models (DTM; usgs_combined_temp.dtm, June24_ALL_new.dtm) Source_Produced_Citation_Abbreviation: ARC/INFO ASCII GRID (June24_ALL_new.asc) Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Process_Step: Process_Description: Using ESRI ArcToolbox (version 9.3), converted ARC/INFO ASCII GRID to a temporary ESRI ArcRaster Grid [Conversion Tools, To Raster, ASCIIToRaster]. Removed the NODATA value of zero using ArcToolbox output to a temporary grid [Spatial Analyst Tools, Extraction, ExtractByAttributes - VALUE < 0]. Clipped the temporary grid by a boundary polygon shapefile for the Duxbury to Hull survey area using ArcToolbox creating final interpolated bathymetry grid "DH_bathy5m" [Spatial Analyst Tools, Extraction, ExtractByMask]. Process_Date: 20090624 Source_Produced_Citation_Abbreviation: ESRI ArcRaster Grid (DH_bathy5m) Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@usgs.gov Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 5906 Column_Count: 3741 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: 5.001323 Ordinate_Resolution: 5.001323 Planar_Distance_Units: meters Geodetic_Model: Horizontal_Datum_Name: D_WGS_1984 Ellipsoid_Name: WGS_1984 Semi-major_Axis: 6378137.000000 Denominator_of_Flattening_Ratio: 298.257224 Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: Mean lower low water Depth_Resolution: 0.5 m Depth_Distance_Units: meters Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Value Entity_Type_Definition: Depth in meters below mean lower low water Entity_Type_Definition_Source: ESRI Overview_Description: Entity_and_Attribute_Overview: Swath bathymetry in ESRI ArcRaster format. Data values represent depth in meters referenced to mean lower low water (MLLW). Entity_and_Attribute_Detail_Citation: ESRI Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@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 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: WinZip Format_Version_Number: 9.0 Format_Specification: ESRI Raster GRID format Format_Information_Content: WinZip file containing the ArcRaster grid of swath bathymetric data from the Duxbury to Hull survey area. File_Decompression_Technique: WinZip Transfer_Size: 15 Mbytes Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: http://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathy5m.zip Access_Instructions: Data can be downloaded via the World Wide Web (WWW) Offline_Option: Offline_Media: DVD-ROM Recording_Capacity: Recording_Density: 4.75 Recording_Density_Units: Gbytes Recording_Format: UDF Compatibility_Information: None Fees: None Technical_Prerequisites: These data are available as a ArcInfo 32-bit floating point binary grid in Environmental Systems Research Institute (ESRI) format. The grid consists of two folders, one with the "grid name", and one "info" folder. The two folders for each grid are compressed into one file using WinZip (ver. 9.0) software. To utilize these data, the user must have software capable of uncompressing the WinZip file and importing and viewing an ESRI ArcRaster grid. The two folders for each grid must be uncompressed to the same folder. If during the process of extracting multiple grids in WinZip format to the same folder, the user is prompted by WinZip software to "overwrite existing files" in the info folder select the "yes" option. Extracting grids from different publications into the same folder is not recommended and will likely render some of your grids unusable. Metadata_Reference_Information: Metadata_Date: 20091026 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Seth Ackerman Contact_Organization: U.S. Geological Survey Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical address Address: 384 Woods Hole Rd. City: Woods Hole State_or_Province: MA Postal_Code: 02543-1598 Country: USA Contact_Voice_Telephone: 508-548-8700 x2315 Contact_Facsimile_Telephone: 508-457-2310 Contact_Electronic_Mail_Address: sackerman@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_Extensions: Online_Linkage: http://www.esri.com/metadata/esriprof80.html Profile_Name: ESRI Metadata Profile