U.S. Geological Survey
2012
Interpolated swath bathymetry collected by the U.S. Geological Survey - Woods Hole Coastal and Marine Science Center surrounding the nearshore of the Elizabeth Islands, MA, 2010 (ei_2hm_fill, ESRI grd)
1.0
raster digital data
Open-File Report
2011-1184
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20111184
http://pubs.usgs.gov/of/2011/1184/GIS_catalog/bathy/ei_2hm_fill.zip
Elizabeth A. Pendleton
David C. Twichell
David S. Foster
Charles R. Worley
Barry J. Irwin
William W. Danforth
2012
High-resolution geophysical data from the sea floor surrounding the western Elizabeth Islands, Massachusetts
1.0
Open-File Report
2011-1184
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2011/1184/
These data were collected under a cooperative agreement between the Massachusetts Office of Coastal Zone Management (CZM) and the U.S. Geological Survey (USGS), Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center (WHCMSC). 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 seafloor 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 of coastal Massachusetts, primarily in water depths of 2-30 meters. 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/>). The data collected in this study area located around the western extent of the Elizabeth Islands includes high resolution bathymetry, acoustic-backscatter intensity, seismic-reflection, and navigation data. These data were collected during a nearshore cruise in September 2010 onboard the R/V Rafael using the following equipment: an SEA Ltd SwathPlus interferometric sonar (234 kHz), Klein 3000 dual frequency sidescan sonar, an Edgetech 424 chirp subbottom profiling system, and 4 GPS antennae. More information about the cruise conducted as part of the project: Geologic Mapping of the Seafloor Offshore of Massachusetts can be found on the Woods Hole Coastal and Marine Science Center Field Activity webpage:
<http://quashnet.er.usgs.gov/data/2010/10003/>
This grid represents approximately 24.5 square km of bathymetric data that were collected in 2010. These data are used to define the sea-floor morphology surrounding the nearshore of the western Elizabeth Islands, Massachusetts. This interpolated grid provides a complete seafloor surface for data visualization and presentation.
20100910
20100916
Data were not collected on 20100915 due to weather conditions.
None planned
-70.995552
-70.847928
41.462328
41.388012
USGS Metadata Identifier
USGS:558066fb-7d71-4d45-8628-b84859125da1
None
U.S. Geological Survey
USGS
Woods Hole Coastal and Marine Science Center
WHCMSC
Coastal and Marine Geology Program
CMGP
bathymetry
swath bathymetry
interferometry
SEA Ltd Swathplus Interferometric sonar
Info Bank ID R-3-1-BZ
sea-floor morphology
WHCMSC field activity serial number 2010-003-FA
ArcRaster grid
R/V Rafael
ISO 19115 Topic Category
oceans
elevation
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
bathymetry
sea-floor characteristics
interferometric sonar
marine geophysics
geospatial datasets
None
North America
United States
Atlantic Ocean
Massachusetts
Cuttyhunk Island
Nashawena Island
Elizabeth Islands
Buzzards Bay
Vineyard Sound
Quicks Hole
Cuttyhunk Harbor
Sow and Pigs Reef
Penikese Island
Gull Island
None
Not to be used for navigation. The 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.
David C. Twichell
U.S. Geological Survey
Oceanographer
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2266
(508) 457-2310
dtwichell@usgs.gov
http://pubs.usgs.gov/of/2011/1184/GIS_catalog/bathy/bathy_fill.png
Woods Hole Coastal and Marine Science Center Swath interferometric bathymetry surrounding the nearshore of the Elizabeth Islands, MA
PNG
Microsoft Windows 7 Enterprise Service Pack 1; ArcGIS Desktop 9.3 Service Pack 1; Build 1850
Calder, B.R.
2003
Automatic Statistical Processing of Multibeam Echosounder Data
document
International Hydrographic Review
Volume 4
The Netherlands
INT HYDROGRAPHIC BUREAU
Any spurious data points were removed during processing.
All the bathymetric data from cruise 2010-003-FA were used to generate this grid, however, l13f1 and l22f1 were corrupted during acquisition, so these lines are not complete. The generator shorted out causing write errors in the raw swath file.
The navigation for these data was acquired with a Coda Octopus F180 Differential Global Positioning System + Wide Area Augmentation System (DGPS+WAAS); they are accurate to + or - 1 to 2 meters, horizontally. All DGPS data are referenced to WGS84, and the horizontal distance between the pole-mounted interferometric sonar transducers, 0.5m below the sea surface, and the DGPS antennae located on the same pole on the bow of the R/V Rafeal, 2.5 m above the sea surface, are corrected.
The theoretical vertical resolution of the SEA Ltd SwathPlus interferometric sonar is 1 % of water depth, approximately 0.03 to 0.25 m within the study area. An Octopus F180 Attitude and Positioning system was used to correct for vessel roll, pitch, heave, and yaw, which has a theoretical vertical accuracy of a few mm. Tidal offsets were corrected to MLLW using RTK GPS heights. Field tests using submerged targets suggest that the vertical accuracy of the RTK tidal correction is less than 30 cm. Gridding algorithms and cell sizes for these data could introduce errors as great as 3 m along the edges of the data. Gridding-induced errors are likely much smaller (< 0.2 m) for most of the study. Changes in ship draft due to water and fuel usage were not considered. Total vertical accuracy for these data are assumed to be + or - 50 cm.
U.S. Geological Survey
unknown
Information unavailable from original metadata.
disc
20100910
20100916
Data were not collected on 20100915 due to weather conditions.
Information unavailable from original metadata.
Swath data acquisition at sea (2010): These bathymetric data were collected with a 234 kHz SEA Ltd Swathplus interferometric sonar mounted on the bow of the R/V Rafael of Woods Hole, MA. Data were acquired between Sept. 10, 2010 and Sept. 16, 2010. All data were acquired with SwathPlus Software (version: 3.7.0). Tracklines are spaced 100 m apart in the shore parallel direction.
SwathPlus Software (version: 3.7.0) was used to acquire the raw swath data (*.sxr) and output a processed soundings file (*.sxp). Several bathy filters were applied to the processed file within SwathPlus to remove erroneous soundings and reduce the density of the data. Corrections were also applied for speed of sound changes (using sound velocity profiles), ship motion, GPS antennae offsets, and transducer depth and angle below the surface. Bathy filters included a low amplitude (100%), range (1-m below the surface), box (2-m to avoid nadir), alongtrack 1 (depth difference of 10-m, window size 10-m, and learn rate of 0.6), alongtrack 2 (depth difference of 1-m, window size 1-m, and learn rate of 0.9), and a mean filter (0.1-m).Several lines (l91f1-l100f1) were in very shallow water between Nashawena and Cuttyhunk. The filters used above for the majority of the survey were not tracking the seafloor well in very shallow water. All filters except the low amplitude and mean filter were turned off for these shallow water lines, to allow more data into the processed file. This procedure resulted in more editing later in CARIS, but it preserved more good data as well.
2010
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2259
(508) 457-2310
ependleton@usgs.gov
CARIS (version: HIPS and SIPS 7.0; service pack 2) was used to further process, finalize, and create a surface from the bathy files (*.sxp) from SwathPlus. CARIS processing with HIPS (hydrographic information processing system) has a workflow that ensures the user has done all necessary corrections to the soundings before creating a final gridded surface. The workflow starts with creating a vessel file (the R/V Rafael for this cruise). The vessel file contains any information related to GPS, MRU, and water level offsets that weren't included during acquisition using SwathPlus. Additionally, the user can report any errors in offsets (i.e. MRU to transducer measurement error, usually around 1-2 cm), which will later be used to calculate TPU (total propagated uncertainty), which is a requirement for CUBE (Combined Uncertainty and Bathymetry Estimator) editing (Calder, 2003). The next steps in the HIPS workflow include creating a project and converting the *.sxp data to CARIS HDCS (hydrographic cesar) format. Sound velocity corrections are the next step in data processing. Errors in soundings due to additional sound refraction not accounted for by sound velocity profiles were done using the CARIS refraction editor. These artifacts can be recognized in a cross-swath profile of a relatively flat patch of sea floor. When viewing the swath data across a profile, the sea floor will appear to have a "frown" or "smile" when in fact the data should be flat across the profile. Insufficient and/or erroneous sound velocity information results in an under or over-estimate of water depth, which increases with distance from the center of the swath. Next a tide correction was applied in CARIS (described in the next process step) and merged with the soundings, and then the TPU was calculated in order to utilize the CUBE editor, which is an uncertainty based data cleaning tool that creates a 'best estimate' surface for the soundings. The cube surface is then used to further QC the soundings. Some lines required swath editing or subset editing as well as automated filtering, especially in the shallow water areas (l91f1-l100f1). The final step in the workflow was to finalize the surface (at 2.5 m resolution) and export it from CARIS in XYZ format, which can then be imported to other programs.
2010
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2259
(508) 457-2310
ependleton@usgs.gov
In order to apply a tidal correction to the soundings, an offset from Mean Sea Level MSL) to Mean Lower Low Water (MLLW) (-0.676 m) was entered into the HYPACK configuration file for the RTK device (dev 0) setup prior to the survey. This value was calculated by setting a DGPS antenna on a number of survey stations around Buzzard's Bay and using the bench mark sheets in conjunction with the DGPS height calculations to determine the offset from MLLW to MSL. Calculated HYPACK RTK water level heights were then extracted from the raw HYPACK files using an AWK script (parseNovatelHypackTides.awk), which calculates the MLLW tide value for each Julian day of the survey. An offset of 2.9 meters was added to each calculated tide value (TID 0) to compensate for the RTK antenna to water line offset, and then the sign was inverted. Since HYPACK reports water level heights relative to MLLW, heights above the MLLW datum are reported as negative values because they are above the datum per standard surveying XYZ convention. The file resulting from running the AWK script produces a file of MLLW tidal height corrections formatted in the CARIS TID file format: YYYY/MM/DD HH:MM 0.00 where 0.00 is the correct water level height. The RTK heights were then merged into the processed CARIS depth soundings in the bathy processing workflow using the Tide load and Merge functions.
2010
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700 x2259
(508) 457-2310
ependleton@usgs.gov
The 2.5 meter tide corrected base surface that was finalized and exported from CARISwas then gridded in ArcMap (version 9.3) using 3D Analyst - natural neighbors. An output cell-size of 2.5 meters was used, and NoData values (gaps within the survey bounds) were interpolated within the domain. A shapefile polygon representing the survey boundary was used to clip the grid to the extent of the data.
20110504
Elizabeth Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd
Woods Hole
MA
02543-1598
USA
508-548-8700 x2259
508-457-2310
ependleton@usgs.gov
Edits to the metadata were made to fix any errors that MP v 2.9.32 flagged. This is necessary to enable the metadata to be successfully harvested for various data catalogs. In some cases, this meant adding text "Information unavailable" or "Information unavailable from original metadata" for those required fields that were left blank. Other minor edits were probably performed (title, publisher, publication place, etc.). Fixed a link to the project page in the abstract. The source information was incomplete and had to be modified to meet the standard. The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. The link to the data catalog page in the Distribution_Information section had to be fixed. The metadata date (but not the metadata creator) was edited to reflect the date of these changes. The metadata available from a harvester may supersede metadata bundled within a download file. Compare the metadata dates to determine which metadata file is most recent.
20160601
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
USGS Thesaurus keywords added to the keyword section.
20180720
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Crossref DOI link was added as the first link in the metadata.
20191118
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20200908
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
pixel
3194
4866
1
Universal Transverse Mercator
19
0.999600
-69.000000
0.000000
500000.000000
0.000000
row and column
2.500000
2.500000
meters
D_WGS_1984
WGS_1984
6378137.000000
298.257224
Mean lower low water
0.1
meters
Implicit coordinate
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Rd.
Woods Hole
MA
02543-1598
(508) 548-8700x2259
(508) 457-2310
ependleton@usgs.gov
Downloadable Data
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.
AIG
ArcGIS 9.3
The zip (WinZip version 14.5) file contains a folder with a ESRI binary grid of bathymetric data at 2.5-meter resolution and the associated metadata
Use WinZip or pkUnzip
14.3
http://pubs.usgs.gov/of/2011/1184/GIS_catalog/bathy/ei_2hm_fill.zip
http://pubs.usgs.gov/of/2011/1184/html/GIS_catalog.html
Data can be downloaded via the World Wide Web (WWW)
DVD-ROM
4.75
Gbytes
UDF
None
The grid contained in the .zip file is available as an ESRI binary grid. To utilize this data, the user must have a GIS software package capable of reading an ESRI binary grid.
20240318
Elizabeth A. Pendleton
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
508-548-8700 x2259
(508)-457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the person is no longer with USGS. (updated on 20240318)
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None
http://www.esri.com/metadata/esriprof80.html
ESRI Metadata Profile