Dataset Identification:
- These data were collected under a cooperative agreement with the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Science Center. 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 reserves, and assessing environmental changes due to natural or human impacts. The project is focused on the inshore waters (5-30m 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 Cape Ann and Salisbury Beach Massachusetts project area. They were collected in two separate surveys in 2004 and 2005 and cover approximately 325 square kilometers of the inner continental shelf. High resolution bathymetry and backscatter intensity were collected in 2004 and 2005. Seismic profile data, sediment samples and bottom photography were also collected in 2005.
- Title 5 meter ArcRaster grid of swath bathymetry of inshore area of Cape Ann - Salisbury Beach Massachusetts survey area (BATH_IS5m, UTM Zone 19, WGS84)
- publication Date 2008-01-01
- Name Open-File Report
- Issue 2007-1373
- organisation Name U.S. Geological Survey, Coastal and Marine Geology Program
- Contact information
-
- Address
-
- , Woods Hole Coastal and Marine Science Center, Woods Hole, Massachusetts
- organisation Name U.S. Geological Survey
- organisation Name Walter A. Barnhardt
- organisation Name Brian D. Andrews
- organisation Name Seth D. Ackerman
- organisation Name Wayne E. Baldwin
- organisation Name Christopher J. Hein
- organisation Name
- Contact information
-
- Linkage for online resource
Theme keywords (theme):
U.S. Geological Survey
USGS
Coastal and Marine Geology Program
CMGP
Woods Hole Science Center
WHSC
Bathymetry
Seafloor
Marine Geology
SEA SwathPlus
Swath Bathymetry
Interferometric Sonar
ArcGIS Raster
field activity serial number 05005
R/V Connecticut
- Title None
Location keywords:
North America
United States
Atlantic Ocean
Gulf of Maine
Bigelow Bight
Merrimack River
Ipswich Bay
Massachusetts
Cape Ann
Salisbury Beach
Plum Island
- Title None
Stratum keywords:
Seafloor
sea floor
- Title None
Temporal keywords:
2005
- Title None
purpose:
Browse image (thumbnail):
- maintenance or update frequency: notPlanned
- Constraints
-
- Use limitation statement:
- 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.
- Legal Constraints
-
- use constraint: otherRestrictions
- Other constraints
- Use Constraints: Intended scale of data is 1:25,000. Data are not intended for navigational use. 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.
- Legal Constraints
-
- Access Constraints otherRestrictions
- Other constraints
- Access Constraints: None
Resource extent
-
- westBoundLongitude -70.811735
- eastBoundLongitude -70.650661
- northBoundLatitude 42.864755
- southBoundLatitude 42.660515
Geographic Bounding Box - Temporal Extent
Geographic Extent
2005-09-08
2005-09-16
- individual Name Brian Andrews
- organisation Name U.S. Geological Survey
- position Name Geographer
- Contact information
-
- Telephone
-
- Voice 508-548-8700 x2348
- Fax 508-457-2310
- Address
-
- 384 Woods Hole Rd., Woods Hole, MA, 02543-1598 Country USA
- electronic Mail Address bandrews@usgs.gov
Grid spatial representation
- number of grid dimensions: 3
- Grid axis property:
-
- Grid Dimension
-
- Dimension Name: row
- Dimension Size 4484
- Grid Dimension
-
- Dimension Name: column
- Dimension Size 2544
- Grid Dimension
-
- Dimension Name: vertical
- Dimension Size 1
- cell geometry type: area
- transformation parameter availability:
Coverage description
- Type of coverage content
- Cell value attribute description:
- Band
-
- descriptor Information unavailable from original metadata.
- sequence Identifier
-
- name Information unavailable from original metadata.
- Long Wavelength -28.8
- Short Wavelength -2.5
- units
Content information: feature catalog description
- Included With Dataset true
- Feature Types
Data quality information
Scope of quality information
- source
-
- source description Source Contribution: System Setup and Operation: The Systems Engineering and Assessment (SEA) Ltd. SwathPlus bathymetric sonar was configured in a rigid pole-mount and deployed from the starboard side of the R/V Connecticut. A TSS DMS 2-05 motion sensor was mounted directly above and in-line with the transducers. An RTK-GPS antenna was mounted adjacent to the rigid-pole mount. 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. An Applied Microsystems SV Plus sound velocity profiler was used to collect speed of sound profiles at forty-two stations. A patch test was conducted at the beginning of the survey in order to measure roll angle offsets. Roll angle offsets can have a strong effect on the accuracy of depth measurements. (The roll angle offset is the difference between the motion sensor vertical measurement and the nominal mount angle of the transducers (30 degrees)). The calculated roll angle offsets were stored within the SEA Swath Processor acquisition software. Navigation: The USGS established a Real-Time Kinematic Global Positioning System (RTK-GPS) that provided horizontal (x and y) and vertical (z) positioning during the survey. The RTK-corrected GPS signal was sent to the ship once every second from a base station positioned on the roof of the Air Force Antenna Station (USAF/AFRC/SNHA) in Ipswich, Massachusetts. Shipboard navigation data (x, y, and z) were stored in Hypack, Inc. Hydrographic Survey Software (http://www.hypack.com) raw data files and used for positioning of geophysical instrumentation. The offset between orthometric (NAVD88) and local chart datum (MLLW) as reported at the NOAA Tidal Station #8440452, Parker River National Wildlife Refuge, was applied to the RTK signal. This allows for elevations (z) received at the shipboard RTK antenna to be referenced to Mean Lower Low Water (MLLW) (that is, elevations are stored as distance of the RTK antenna above MLLW). During post-processing, the distance of the RTK antenna above the water-line is removed from the stored RTK elevations. The resulting value is then applied to the bathymetric soundings, yielding data referenced to MLLW.Source Type Information unavailable from original metadata.
- source citation
-
- Title Raw data collected for field activitie 2005-005-FA
- publication Date
- other Citation Details The source citation information is inferred from other information in the metadata and was not part of the original metadata file. Source time period of content was inferred from the time period of the dataset.
- cited responsible party - originator
-
- organisation Name Information unavailable from original metadata.
Resource extent
- Temporal Extent
2005-09-08
2005-09-08
- name Of Measure Horizontal Positional Accuracy Report
- evaluation Method Description These data were navigated using Real-Time Kinematic Global Positioning System (RTK-GPS) which provides horizontal positional accuracies (x and y) on the decimeter scale (http://www.noaa.gov; http://www.nos.noaa.gov; http://www.ngs.noaa.gov).
- name Of Measure Vertical Positional Accuracy Report
- evaluation Method Description Vertical accuracy of the acquisition system may approximate 1% of water depth, 0.1-0.3 meters within the survey area. However, overall vertical accuracies of <= 0.5 m are assumed based on the following considerations. Ship motion was recorded with a TSS DMS 2-05 and used to correct for heave, pitch, roll and yaw. RTK-GPS was used to establish water-level heights relative to Mean Lower Low Water (MLLW), providing decimeter-scale accuracies. 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. Fluctuations in the vessel draft due to fuel and water usage were not determined.
- evaluation Method Description Soundings were processed and edited using CARIS 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. Swath bathymetry was collected along additional offshore tie-lines for use with the seismic profiles and for cross-track depth comparison. Bathymetric data collected on these offshore tie lines are not included in this grid.
- evaluation Method Description Soundings were processed and edited using CARIS 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. Swath bathymetry was collected along additional offshore tie-lines for use with the seismic profiles and for cross-track depth comparison. Bathymetric data collected on these offshore tie lines are not included in this grid.
- measure Description Information unavailable from original metadata.
Resource distribution information
Distributor
- individual Name Brian Andrews
- organisation Name U.S. Geological Survey, Woods Hole Science Center
- position Name Geographer
- Contact information
-
- Telephone
-
- Voice 508-548-8700 x2348
- Address
-
- 384 Woods Hole Rd., Woods Hole, MA, 02543 Country USA
- electronic Mail Address bandrews@usgs.gov
- fees None
- Format name AIG
- Format version 9.0
- specification > ESRI Raster GRID format
- file Decompression Technique WinZip
- transfer Size 6.2
- Linkage for online resource
-
- name AIG
- URL: http://pubs.usgs.gov/of/2007/1373/GIS/raster/bathymetry/bath_is5m.zip
- link function
- Description WinZip file containing the ArcRaster grid of swath bathymetric data collected in the near shore survey area of the Cape Ann to Salisbury Beach Survey Area.
- Medium of distribution
-
- name dvdRom
- medium Format UDF
- density 4.75
- density Units Gbytes
- medium Note Format Information Content: WinZip file containing the ArcRaster grid of swath bathymetric data collected in the near shore survey area of the Cape Ann to Salisbury Beach Survey Area. Compatibility Information: None
- maintenance or update frequency: annually
- notes: This metadata was automatically generated from the FGDC Content Standards for Digital Geospatial Metadata standard (version FGDC-STD-001-1998) using the 2012-06-20T17:21:00 version of the FGDC RSE to ISO 19115-2 transform.
- individual Name Brian Andrews
- organisation Name U.S. Geological Survey
- position Name Geographer
- Contact information
-
- Telephone
-
- Voice 508-548-8700 x2348
- Fax 508-457-2310
- Address
-
- 384 Woods Hole Rd., Woods Hole, MA, 02543-1598 Country USA
- electronic Mail Address bandrews@usgs.gov