DH_bathy_wgaps.asc: ASCII grid of bathymetry data collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration offshore of Massachusetts between Duxbury and Hull with data gaps (ARC/INFO ASCII GRID)

Metadata:

• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 2010

Title:

DH_bathy_wgaps.asc: ASCII grid of bathymetry data collected by the U.S. Geological Survey and the National Oceanic and Atmospheric Administration offshore of Massachusetts between Duxbury and Hull with data gaps (ARC/INFO ASCII 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:

<https://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathy_wgaps.zip>

Online_Linkage: <https://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: <https://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. This grid shows the extent of data collected along each swath with no interpolation, therefore it demonstrates the data gaps where adjacent swaths did not meet and where gaps exist because the bathymetric data along a particular track were deemed usable in the final grid.

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: ARC/INFO ASCII 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:

<https://pubs.usgs.gov/of/2009/1072/GIS/browse_jpg/big/DH_bathy_wgaps.jpg>

Browse_Graphic_File_Description: ASCII grid 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: <https://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: <https://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: <https://pubs.usgs.gov/of/2007/1373/>

Cross_Reference:

Citation_Information:

Originator: 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 the un-interpolated data; gaps occurred along-track and between adjacent lines. The NOADATA value when converted to a raster and loaded into ArcMap is 0; although the head of the ASCII file indicates that the NODATA value is 0.000100.

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 were 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 by interference during the first leg of survey 06012 (lines l1f1 - l99f2, 4-14 Aug 2006). Frequent navigation dropouts halted data collection for extended periods during the survey 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 Differential Global Positioning System (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 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 some cases 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 (see note in completeness report) and gaps between survey lines in shallow water during survey 07001. BASE surface creation for NOAA hydrographic survey H10993: A 5 meter BASE surface 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, H10993_5m.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 and NOAA 5 meter grid (June24_5m.hns, H10993_5m.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]. Two DTM files with the same filenames were created. The USGS 5 meter and the 5 meter NOAA dtm were combined using IVS 3D Fledermaus Commander (FMCommand) and the tool "dtmmerge" (outputfile: June24_ALL_gaps.dtm). The floating-point grid was exported to ARC/INFO ASCII GRID format (outputfile: June24_ALL_gaps.asc).

Process_Date: 20090624

Source_Produced_Citation_Abbreviation: IVS 3D Digital Terrain Model (DTM; June24_ALL_gaps.dtm)

Source_Produced_Citation_Abbreviation: ARC/INFO ASCII GRID (June24_ALL_gaps.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:

The ARC/INFO ASCII GRID format was renamed from June24_ALL_gaps.asc to DH_bathyhlshd_wgaps.asc

Process_Date: 20090708

Source_Produced_Citation_Abbreviation: ARC/INFO ASCII GRID (DH_bathyhlshd_wgaps.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

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Pixel

Row_Count: 6052

Column_Count: 3761

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: 5.001330

Ordinate_Resolution: 5.001330

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

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 ARC/INFO ASCII GRID of swath bathymetric data from the Duxbury to Hull survey area.

File_Decompression_Technique: WinZip

Transfer_Size: 15 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<https://pubs.usgs.gov/of/2009/1072/GIS/raster/bathy/DH_bathy_wgaps.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:

This zip file contains an ARC/INFO ASCII GRID in Environmental Systems Research Institute (ESRI) format. To utilize this data, the user must have a GIS software package capable of importing or converting the ARC/INFO ASCII GRID. A depth-colored hillshade GeoTIFF image of this dataset is also on this report (DH_bathyhlshd_wgaps.tif). The GeoTIFF image version can be viewed with any software capable of opening a TIFF image or in ArcExplorer, a free GIS viewer capable of displaying the GeoTIFF image data (available from ESRI at www.esri.com).

Metadata_Reference_Information:

Metadata_Date: 20091027

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