National Oceanic and Atmospheric Administration
U.S. Geological Survey
2010
4-m Grid of Combined Multibeam and LIDAR Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Surveys H11442 and H11225 offshore of Niantic, Connecticut (NIANTIC_GEO, Geographic, WGS84)
1.0
raster digital data
Open-File Report
2009-1231
Woods Hole Coastal and Marine Science Center, Woods Hole, MA
U.S. Geological Survey, Coastal and Marine Geology Program
https://doi.org/10.3133/ofr20091231
http://pubs.usgs.gov/of/2009/1231/data/bathy/grids/niantic/niantic_geo.zip
http://pubs.usgs.gov/of/2009/1231/data/bathy/grids/niantic/
http://pubs.usgs.gov/of/2009/1231/html/catalog.html
L.J. Poppe
W.W. Danforth
K.Y. McMullen
C.E. Parker
P.G. Lewit
E.F. Doran
2010
Integrated Multibeam and LIDAR Bathymetry Data Offshore of New London and Niantic, Connecticut
1.0
Open-File Report
2009-1231
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2009/1231/
Nearshore areas within Long Island Sound are of great interest to the Connecticut and New York research and management communities because of their ecological, recreational, and commercial importance. However, although advances in multibeam echosounder technology permit the construction of detailed digital terrain models of seafloor topography within deeper waters, limitations inherent with collecting multibeam data make using this technology in shallower waters (<10-m deep) more difficult and expensive. These limitations have often resulted in gaps of no data between multibeam bathymetric datasets and the adjacent shoreline. To address this problem, complete-coverage multibeam bathymetry acquired offshore of New London and Niantic Bay, Connecticut, has been integrated with hydrographic LIDAR acquired along the nearshore. The result is a more continuous seafloor perspective and a much smaller gap between the digital bathymetric data and the shoreline. These datasets are provided as ESRI grid and GeoTIFF formats in order to facilitate access, compatibility, and utility.
To release a 4-m grid of the combined multibeam and LIDAR bathymetry generated during NOAA surveys H11442 and H11225 offshore of Niantic, Connecticut in geographic, WGS84.
20040120
20050522
ground condition (See the source citation in the lineage section for individual component's specific dates.)
None planned
-72.250977
-72.094949
41.329324
41.251997
USGS Metadata Identifier
USGS:e79861ac-d0b1-4a11-939e-d51eb2f3b62f
None
U.S. Geological Survey
USGS
Woods Hole Coastal and Marine Science Center
multibeam bathymetry
LIDAR
Coastal and Marine Geology Program
CMGP
WHCMSC
RESON 8101
NOAA survey H11442
H11442
National Oceanic and Atmospheric Administration
NOAA
grid
Open-File Report 2009-1231
ArcRaster grid
OFR 2009-1231
RESON 8125
NOAA survey H11225
H11225
bathymetry
Connecticut Department of Environmental Protection
CT DEP
ISO 19115 Topic Category
elevation
oceans
USGS Thesaurus
bathymetry
topography
sea-floor characteristics
multibeam sonar
lidar
marine geophysics
geospatial datasets
None
Connecticut
Niantic
U.S. East Coast
United States
North America
Atlantic Ocean
Niantic Bay
Giants Neck
Long Island Sound
Black Point
Twotree Island
None
Data are not to be used for navigation purposes.
Public domain data are freely redistributable with proper metadata and source attribution. Please recognize the National Oceanic and Atmospheric Administration (NOAA) and U.S. Geological Survey (USGS) as the originators of this information.
U.S. Geological Survey
Larry Poppe
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
lpoppe@usgs.gov
http://pubs.usgs.gov/of/2009/1231/data/bathy/grids/niantic/niantic_geo.jpg
Thumbnail image showing the 4-m gridded multibeam and LIDAR bathymetry collected during NOAA surveys H11442 and H11225 in Geographic
JPEG
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500
Emily B. Christman
2005
H11442
1.0
document
Descriptive Report
H11442
Atlantic Hydrographic Branch, Norfolk, VA
National Ocean Survey, National Oceanic and Atmospheric Administration
http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11442/DR/H11442.pdf
Darren Stephenson
2004
H11225
1.0
document
Descriptive Report
H11225
Atlantic Hydrographic Branch, Norfolk, VA
National Ocean Survey, National Oceanic and Atmospheric Administration
http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11225/DR/H11225.pdf
Poppe, L.J.
Ackerman, S.D.
Doran, E.F.
Beaver, A.J.
Crocker, J.M.
Schattgen, P.T.
2006
Interpolation of reconnaissance multibeam bathymetry from north-central Long Island Sound
1.0
Open-File Report
2005-1145
Reston, VA
U.S. Geological Survey
http://pubs.usgs.gov/of/2005/1145/
Poppe, L.J.
Lewis, R.S.
Denny, J.F.
Parolski, K.F.
DiGiacomo-Cohen, M.L.
Tolderlund, D.S.
1998
Sidescan sonar image, surficial geologic interpretation, and bathymetry of the Long Island Sound sea floor in Niantic Bay, Connecticut
1.0
map
Geologic Investigations Map
I-2625
Reston, VA
U.S. Geological Survey
No additional checks for consistency were performed on this data.
All collected data were processed and used to produce this dataset.
Horizontal position of the launches acquiring multibeam bathymetry were determined using GPS corrected by U.S. Coast Guard differential GPS beacon stations at Moriches, New York, and Sandy Hook, New Jersey. Real-time positioning during LIDAR acquisition was obtained by an Ashtech GG24 GPS receiver combined with Thales GeoSolutions Wide Area DGPS. Original horizontal resolution of the MBES data was 1 m; the final CARIS combined base surface for the MBES data was produced at a 3-m cell size; original cell size of the gridded LIDAR data was primarily 4 m.
Attitude of the launches (e.g. pitch, roll, and heave) acquiring multibeam bathymetry were monitored by an Applanix TSS POS/MV 320 Version 3 GPS aided navigation system. Real-time positioning during LIDAR acquisition was obtained by an Ashtech GG24 GPS receiver combined with Thales GeoSolutions Wide Area DGPS. Ashtech Z12 GPS receivers, provided as part of the Airborne System and Ground Systems, also logged GPS data on the aircraft and at a locally established base station to provide post processed KGPS position solutions. Received infrared laser energy, supplemented by an Altitude Heading Reference System (AHRS) inertial height reference and kinematic GPS, determined the height of the aircraft. The vertical resolution of the original bathymetry data is approximately 0.5% of the water depth.
National Ocean Survey, National Oceanic and Atmospheric Administration
Unpublished Material
H11442 bathymetry
raster digital data
disc
20050418
20050506
ground condition
Information unavailable from original metadata.
Original processed multibeam bathymetric data.
National Ocean Survey, National Oceanic and Atmospheric Administration
Unpublished Material
H11225 bathymetry
raster digital data
disc
20040120
20040305
ground condition
Information unavailable from original metadata.
Original processed LIDAR bathymetric data.
Two 8.5-m aluminum Jensen launches deployed from the NOAA Ship Thomas Jefferson were used to acquire the multibeam echosounder (MBES) bathymetric data for surveys H11441 and H11442 during April - May 2005 off New London, Connecticut. Although most of the deeper parts of these surveys were completely covered during MBES acquisition, coverage in the shallower areas (<10 m) was limited to 'postage stamp' developments around target areas and reconnaissance cross lines. The MBES data were collected with hull-mounted RESON SeaBat 240-kHz 8101 and 455-kHz 8125 shallow-water systems. These systems measure two-way sound travel time across a 150-degree swath and 120-degree swath, respectively. The SeaBat 8101 has 101 beams at a 1.5-degree beam spacing. The SeaBat 8125 has 240 beams with a cross-track beam width of 0.5 degrees at nadir. Original horizontal resolution of the MBES data was 1 m; vertical resolution of the MBES data is about 0.5% of the water depth. The bathymetric data were acquired in XTF (extended Triton data format) and processed by NOAA using CARIS HIPS (Hydrographic Image Processing System) software for quality control, to incorporate sound velocity and tidal corrections, and to produce the continuous digital terrain model. Navigation was by TSS POS/MV 320 differential GPS-assisted inertial navigation systems; the differential GPS beacons used were from Moriches, New York, and Sandy Hook, New Jersey. HYPACK MAX was used for acquisition line navigation. Sound velocity corrections were derived using frequent SEACAT CTD (conductivity-temperature-depth) profiles. Typically, a CTD cast was conducted every four to six hours of MBES acquisition. Tidal zone corrections were calculated from data acquired from National Water Level Observation stations at New London, Connecticut and Montauk, New York. Vertical datum is mean lower low water. Individuals interested in detail descriptions of the MBES acquisition and processing should consult the descriptive reports. Eleven reconnaissance cruises were conducted aboard a leased lobster boat to monitor water clarity prior to commencement of airborne LIDAR operations of surveys H11224 and H11225. These cruises, which utilized Secchi disks to determine water clarity, were conducted between the Connecticut River and Fishers Island during May 9, 2003 and January 11, 2004, when water clarity was deemed adequate. The LIDAR (light detection and ranging) data were acquired by Tenix LADS, Inc. during January 25 - March 3, 2004 with a LADS Mk II system. Airborne survey operations were conducted aboard a Dash 8-202 series aircraft with a Nd:YAG laser at heights between 1,200 and 2,200 feet, at ground speeds between 140 and 210 knots, and at 4x4 and 3x3-m laser-spot spacings. Green laser pulses were scanned beneath the aircraft in a rectilinear pattern. The returned green-laser energy reflected from the sea surface and seafloor were captured and digitally recorded. Received infrared laser energy, supplemented by an Altitude Heading Reference System (AHRS) inertial height reference and kinematic GPS, determined the height of the aircraft. Real-time positioning was provided by WADGPS (wide area differential global positioning system). Acquired data were processed with CARIS HIPS. Individuals interested in detail descriptions of the LIDAR acquisition and processing should consult the descriptive reports. Vertical datum is mean lower low water; X and Y units are meters; UTM Zone 18, NAD83. The final CARIS combined base surfaces were produced at a 4-m cell size for surveys H11441, H11224, and H11225; the final CARIS combined base surface for survey H11442 was produced at a 3-m cell size.
2005
H11441 CARIS HIPS database
H11442 CARIS HIPS database
H11224 CARIS HIPS database
H11225 CARIS HIPS database
National Oceanic and Atmospheric Administration
Marc Moser
Field Operations Officer
mailing address
439 West York Street
Norfolk
VA
23510
USA
757-441-6746
marc.s.moser@noaa.gov
The CARIS field sheets for four surveys were inspected to determine if there was vertical and/or horizontal offsets where the surveys overlapped. NOAA LIDAR surveys (H11224 and H11225) showed no relative offset in either the vertical or horizontal direction. The same was found for the two adjacent NOAA multibeam surveys (H11441 and H11442). However, a consistent 25-cm vertical offset was found between the multibeam and LIDAR data sets, with the multibeam data being consistently 25 cm shallower than the overlapping LIDAR survey. To correct this problem, it was decided that multibeam surveys H11441 and H11442 would be offset (deeper) by 25 cm and thus referenced to LIDAR surveys H11224 and H11225. After reviewing the Data Acquisition and Processing Reports (DAPR) in addition to the Descriptive Report (DR) for each of the 4 surveys, 25 cm is within the vertical error budget as reported by Tenix for the LADS system, and as reported for the Reson 8101 and 8125 systerms installed on the NOAA launches. Vertical control was the same for all surveys. Since the 25 cm offset was not outside of the error analyses for all surveys, it was decided to reference the multibeam data to the LIDAR data by lowering the multibeam depth soundings, mainly to keep the 0 LIDAR depth contour (sea surface as obtained by the LADS system) at sea level, but also because the Tenix LADS surveys were conducted using real-time kinematic GPS techniques and judged to be accurate in the vertical dimension.
H11441 CARIS HIPS database
H11442 CARIS HIPS database
H11224 CARIS HIPS database
H11225 CARIS HIPS database
2009
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2274
508-457-2310
bdanforth@usgs.gov
The field sheets from surveys H11442 and H11225 (average depths, not the shoal based field sheets) were imported into the Fledermaus v6.7 program DMagic to make equivalent digital terrain model (DTM) files. The floating piont format for each sounding depth point is preserved during data import. Additionally, these fieldsheets were imported into DMagic as "gridded data", therefore re-gridding of data did not occur during the import process and thus preserved the original resolutions of the CARIS fieldsheets:
H11442 3 meter cell size
H11225 4 meter cell size
The H11442 DTM file was then exported as an ESRI ASCII raster file from the DMagic program. The export process preserves the floating point values of the grid cell nodes.
H11442 CARIS HIPS database
H11225 CARIS HIPS database
2009
h11442.dtm
h11225.dtm
h11442.asc
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543
USA
508-548-8700 x2274
508-457-2310
bdanforth@usgs.gov
The ESRI ASCII raster files were imported into ArcMap v9.3 using the ASCII to Raster tool (ArcToolbox, Conversion Tools, To Raster). The only option set here is to import each sounding grid cell value as a floating point number. Subsequently, 25 cm was added to the H11442 raster grid cells, creating a new raster that could now be combined with the LIDAR data set. The H11442 raster file was then exported out of ArcMap using the Raster to ASCII tool (ArcToolbox, Conversion Tools, From Raster).
h11442.asc
2009
h11442.asc
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2274
508-457-2310
bdanforth@usgs.gov
The adjusted multibeam raster was imported back into the Fledermaus v6.7 DMagic program in order to create new DTM files that could be combined with the LIDAR DTM files. The floating piont format for each sounding depth point is preserved during data import. Additionally, the data from the ArcGIS ASCII raster files were imported into DMagic as "gridded data", therefore re-gridding of data did not occur during the import process and thus preserved the original resolutions of the CARIS fieldsheets.
h11442.asc
2009
h11442.dtm
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2274
508-457-2310
bdanforth@usgs.gov
The DTM files from surveys H11442 (now 25 cm deeper) and H11225 were combined into one 4-m grid file using the Fledermaus command line option dtmmerge, and the combined H11442-H11225 grid was exported from DMagic as an ESRI ASCII raster file. The dtmmerge option combines the input grid files and sets the resolution of the output combined grid to the lowest resolution input grid, in this case the LIDAR grid. Additionally the output soundings for the combined grid is based on the average of the nearest input grid soundings for a particular output grid cell. The command line used was:
dtmmerge -in h11225.dtm h11442.dtm -out niantic.dtm -cellsize 4.0 -mode average
h11442.dtm
h11225.dtm
2009
niantic.asc
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2274
508-457-2310
bdanforth@usgs.gov
The ESRI ASCII raster file was then converted into raster within ArcToolbox v9.3 using the ASCII to Raster conversion tool, and reprojected using the data management tool Project Raster (ArcToolbox, Data Management Tools, Projections and Transformations) from UTM Zone 18N, NAD 83 to Geographic, WGS84. The options specified in the Project Raster tool were:
1. Input coordinate system: NAD_1983_UTM_Zone_18N
2. Output coordinate system: GCS_WGS_1984
3. Geographic transformation method: NAD_1983_WGS_1984_5
4. Resampling technique: BILINEAR
5. Output cell size: 0.000043 (decimal degrees, default as calculated by ArcMap for a 4 meter cell size)
The geographic transformation selected is the most accurate one provided by ESRI as it ties in WGS84 with ITRF96, thus reflecting the earth centered offset (x-y-z) between WGS84 and NAD83 (from the ESRI Knowledge Base Document Number 24159).
niantic.asc
2009
niantic_geo
Bill Danforth
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02453-1598
508-548-8700 x2274
508-457-2310
bdanforth@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.). The distribution format name was modified in an attempt to be more consistent with other metadata files of the same data format. 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.
20160412
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
Grid Cell
1801
3634
1
0.000043
0.000043
Decimal degrees
D_WGS_1984
WGS_1984
6378137.000000
298.257224
Mean lower low water
0.1
meters
Explicit depth coordinate included with horizontal coordinates
A 4-m grid of the combined multibeam and LIDAR bathymetry from NOAA surveys H11442 and H11225 in a geographic coordinate system.
U.S. Geological Survey
U.S. Geological Survey
Larry Poppe
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
lpoppe@usgs.gov
Downloadable Data
Neither the U.S. Government, the Department of the Interior, nor the USGS, nor the National Oceanic and Atmospheric Administration (NOAA), nor the Connecticut Department of Environmental Protection (CT DEP) 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, NOAA, or the CT DEP 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
ESRI ArcRaster Grid
One file (niantic_geo.zip) containing the ArcGIS grid file components, browse graphic and metadata.
zip archive
12.9
http://pubs.usgs.gov/of/2009/1231/data/bathy/grids/niantic/niantic_geo.zip
http://pubs.usgs.gov/of/2009/1231/html/catalog.html
Data are downloadable via the World Wide Web (WWW).
CD-ROM
640
Mbytes
ISO9660
None
The user must have a program capable of reading the ESRI grid data format. The user must have software capable of uncompressing archived zip files, such as WinZip or Pkware.
2010
20211116
Larry Poppe
U.S. Geological Survey
Geologist
mailing and physical address
384 Woods Hole Road
Woods Hole
MA
02543-1598
USA
(508) 548-8700 x2314
(508) 457-2310
whsc_data_contact@usgs.gov
The metadata contact email address is a generic address in the event the metadata contact is no longer with the USGS or the email is otherwise invalid.
FGDC Content Standards for Digital Geospatial Metadata
FGDC-STD-001-1998
local time
None
None