NLNB_GEO: 4-m Grid of Combined Multibeam and LIDAR Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Surveys H11441, H11442, H11224, and H11225 offshore of New London and Niantic, Connecticut (Geographic, WGS84)

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: National Oceanic and Atmospheric Administration
Originator: U.S. Geological Survey
Publication_Date: 2010
Title:
NLNB_GEO: 4-m Grid of Combined Multibeam and LIDAR Bathymetry from National Oceanic and Atmospheric Administration (NOAA) Surveys H11441, H11442, H11224, and H11225 offshore of New London and Niantic, Connecticut (Geographic, WGS84)
Edition: 1.0
Geospatial_Data_Presentation_Form: raster digital data
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1231
Publication_Information:
Publication_Place:
USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage:
<https://pubs.usgs.gov/of/2009/1231/data/bathy/grids/combined/nlnb_geo.zip>
Online_Linkage: <https://pubs.usgs.gov/of/2009/1231/data/bathy/grids/combined/>
Online_Linkage: <https://pubs.usgs.gov/of/2009/1231/html/catalog.html>
Larger_Work_Citation:
Citation_Information:
Originator: L.J. Poppe
Originator: W.W. Danforth
Originator: K.Y. McMullen
Originator: C.E. Parker
Originator: P.G. Lewit
Originator: E.F. Doran
Publication_Date: 2010
Title:
Integrated Multibeam and LIDAR Bathymetry Data Offshore of New London and Niantic, Connecticut
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2009-1231
Publication_Information:
Publication_Place:
USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <https://pubs.usgs.gov/of/2009/1231/>
Description:
Abstract:
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.
Purpose:
To release a 4-m grid of the combined multibeam and LIDAR bathymetry generated during NOAA surveys H11441, H11442, H11224, and H11225 offshore of New London and Niantic, Connecticut in geographic, WGS84.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20040120
Ending_Date: 20050522
Currentness_Reference:
ground condition (See the source citation in the lineage section for individual component's specific dates.)
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -72.252716
East_Bounding_Coordinate: -71.983730
North_Bounding_Coordinate: 41.380109
South_Bounding_Coordinate: 41.237268
Keywords:
Theme:
Theme_Keyword_Thesaurus: General
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: USGS
Theme_Keyword: Woods Hole Coastal and Marine Science Center
Theme_Keyword: multibeam bathymetry
Theme_Keyword: LIDAR
Theme_Keyword: Coastal and Marine Geology Program
Theme_Keyword: CMGP
Theme_Keyword: WHCMSC
Theme_Keyword: RESON 8101
Theme_Keyword: NOAA survey H11441
Theme_Keyword: H11441
Theme_Keyword: National Oceanic and Atmospheric Administration
Theme_Keyword: NOAA
Theme_Keyword: grid
Theme_Keyword: Open-File Report 2009-1231
Theme_Keyword: ArcRaster grid
Theme_Keyword: OFR 2009-1231
Theme_Keyword: RESON 8125
Theme_Keyword: NOAA survey H11224
Theme_Keyword: H11224
Theme_Keyword: bathymetry
Theme_Keyword: Connecticut Department of Environmental Protection
Theme_Keyword: CT DEP
Theme_Keyword: NOAA survey H11442
Theme_Keyword: H11442
Theme_Keyword: NOAA survey H11225
Theme_Keyword: H11225
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans and estuaries
Theme_Keyword: oceans and coastal
Theme_Keyword: elevation
Theme_Keyword: oceans
Place:
Place_Keyword_Thesaurus: General
Place_Keyword: Connecticut
Place_Keyword: New London
Place_Keyword: U.S. East Coast
Place_Keyword: United States
Place_Keyword: North America
Place_Keyword: Atlantic Ocean
Place_Keyword: Fishers Island
Place_Keyword: Groton
Place_Keyword: Long Island Sound
Place_Keyword: Avery Point
Place_Keyword: Fishers Island Sound
Place_Keyword: Niantic
Place_Keyword: Niantic Bay
Place_Keyword: Black Point
Place_Keyword: Giants neck
Place_Keyword: Twotree Island
Access_Constraints: None
Use_Constraints:
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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Larry Poppe
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2314
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: lpoppe@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<https://pubs.usgs.gov/of/2009/1231/data/bathy/grids/combined/nlnb_geo.jpg>
Browse_Graphic_File_Description:
Thumbnail image showing the 4-m gridded multibeam and LIDAR bathymetry collected during NOAA surveys H11441, H11442, H11224, and H11225 in Geographic
Browse_Graphic_File_Type: JPEG
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.2.6.1500
Cross_Reference:
Citation_Information:
Originator: Emily B. Christman
Publication_Date: 2005
Title: H11441
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Descriptive Report
Issue_Identification: H11441
Publication_Information:
Publication_Place: Atlantic Hydrographic Branch, Norfolk, VA
Publisher:
National Ocean Survey, National Oceanic and Atmospheric Administration
Online_Linkage:
<http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11441/DR/H11441.pdf>
Cross_Reference:
Citation_Information:
Originator: Darren Stephenson
Publication_Date: 2004
Title: H11224
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Descriptive Report
Issue_Identification: H11224
Publication_Information:
Publication_Place: Atlantic Hydrographic Branch, Norfolk, VA
Publisher:
National Ocean Survey, National Oceanic and Atmospheric Administration
Online_Linkage:
<http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11224/DR/H11224.pdf>
Cross_Reference:
Citation_Information:
Originator: Poppe, L.J.
Originator: Ackerman, S.D.
Originator: Doran, E.F.
Originator: Beaver, A.J.
Originator: Crocker, J.M.
Originator: Schattgen, P.T.
Publication_Date: 2006
Title:
Interpolation of reconnaissance multibeam bathymetry from north-central Long Island Sound
Edition: 1.0
Series_Information:
Series_Name: Open-File Report
Issue_Identification: 2005-1145
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Online_Linkage: <https://pubs.usgs.gov/of/2005/1145/>
Cross_Reference:
Citation_Information:
Originator: Emily B. Christman
Publication_Date: 2005
Title: H11442
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Descriptive Report
Issue_Identification: H11442
Publication_Information:
Publication_Place: Atlantic Hydrographic Branch, Norfolk, VA
Publisher:
National Ocean Survey, National Oceanic and Atmospheric Administration
Online_Linkage:
<http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11442/DR/H11442.pdf>
Cross_Reference:
Citation_Information:
Originator: Darren Stephenson
Publication_Date: 2004
Title: H11225
Edition: 1.0
Geospatial_Data_Presentation_Form: document
Series_Information:
Series_Name: Descriptive Report
Issue_Identification: H11225
Publication_Information:
Publication_Place: Atlantic Hydrographic Branch, Norfolk, VA
Publisher:
National Ocean Survey, National Oceanic and Atmospheric Administration
Other_Citation_Details:
Online_Linkage:
<http://surveys.ngdc.noaa.gov/mgg/NOS/coast/H10001-H12000/H11225/DR/H11225.pdf>
Cross_Reference:
Citation_Information:
Originator: Poppe, L.J.
Originator: Lewis, R.S.
Originator: Denny, J.F.
Originator: Parolski, K.F.
Originator: DiGiacomo-Cohen, M.L.
Originator: Tolderlund, D.S.
Publication_Date: 1998
Title:
Sidescan sonar image, surficial geologic interpretation, and bathymetry of the Long Island Sound sea floor in Niantic Bay, Connecticut
Edition: 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: U.S. Geological Survey Geologic Investigations Map
Issue_Identification: I-2625
Publication_Information:
Publication_Place: Woods Hole Coastal and Marine Science Center, Woods Hole, MA
Publisher: U.S. Geological Survey, Coastal and Marine Geology Program
Data_Quality_Information:
Logical_Consistency_Report:
No additional checks for consistency were performed on this data.
Completeness_Report:
All collected data were processed and used to produce this dataset.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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 surfaces for the MBES data were produced at a 4-m cell size for survey H11441 and a 3-m cell size for survey H11442; original cell size of the gridded LIDAR data was primarily 4 m.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator:
National Ocean Survey, National Oceanic and Atmospheric Administration
Publication_Date: Unpublished Material
Title: H11441 bathymetry
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050427
Ending_Date: 20050522
Source_Currentness_Reference: ground condition
Source_Contribution: Original processed multibeam bathymetric data.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
National Ocean Survey, National Oceanic and Atmospheric Administration
Publication_Date: Unpublished Material
Title: H11224 bathymetry
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20040120
Ending_Date: 20040305
Source_Currentness_Reference: ground condition
Source_Contribution: Original processed LIDAR bathymetric data.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
National Ocean Survey, National Oceanic and Atmospheric Administration
Publication_Date: Unpublished Material
Title: H11442 bathymetry
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20050418
Ending_Date: 20050506
Source_Currentness_Reference: ground condition
Source_Contribution: Original processed multibeam bathymetric data.
Source_Information:
Source_Citation:
Citation_Information:
Originator:
National Ocean Survey, National Oceanic and Atmospheric Administration
Publication_Date: Unpublished Material
Title: H11225 bathymetry
Geospatial_Data_Presentation_Form: raster digital data
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20040120
Ending_Date: 20040305
Source_Currentness_Reference: ground condition
Source_Contribution: Original processed LIDAR bathymetric data.
Process_Step:
Process_Description:
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.
Process_Date: 2005
Source_Produced_Citation_Abbreviation: H11441 CARIS HIPS database
Source_Produced_Citation_Abbreviation: H11224 CARIS HIPS database
Source_Produced_Citation_Abbreviation: H11442 CARIS HIPS database
Source_Produced_Citation_Abbreviation: H11225 CARIS HIPS database
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: National Oceanic and Atmospheric Administration
Contact_Person: Marc Moser
Contact_Position: Field Operations Officer
Contact_Address:
Address_Type: mailing address
Address: 439 West York Street
City: Norfolk
State_or_Province: VA
Postal_Code: 23510
Country: USA
Contact_Voice_Telephone: 757-441-6746
Contact_Electronic_Mail_Address: marc.s.moser@noaa.gov
Process_Step:
Process_Description:
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, and partly because the Tenix LADS surveys were conducted using real-time kinematic GPS techniques and judged to be accurate in the vertical dimension.
Source_Used_Citation_Abbreviation: H11441 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11442 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11224 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11225 CARIS HIPS database
Process_Date: 2009
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Process_Step:
Process_Description:
The field sheets from surveys H11441, H11442, H11224, 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: H11441 4 meter cell size H11442 3 meter cell size H11224 4 meter cell size H11225 4 meter cell size The H11441 and H11442 DTM files were then exported as an ESRI ASCII raster file from the DMagic program.
Source_Used_Citation_Abbreviation: H11441 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11442 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11224 CARIS HIPS database
Source_Used_Citation_Abbreviation: H11225 CARIS HIPS database
Process_Date: 2009
Source_Produced_Citation_Abbreviation: h11441.dtm
Source_Produced_Citation_Abbreviation: h11442.dtm
Source_Produced_Citation_Abbreviation: h11224.dtm
Source_Produced_Citation_Abbreviation: h11225.dtm
Source_Produced_Citation_Abbreviation: h11441.asc
Source_Produced_Citation_Abbreviation: h11442.asc
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543
Country: USA
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Process_Step:
Process_Description:
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 each multibeam survey (H11441 and H11442) raster grid cell, creating a new raster that could now be combined with the LIDAR data sets. Each survey raster file was then exported out of ArcMap using the Raster to ASCII tool (ArcToolbox, Conversion Tools, From Raster).
Source_Used_Citation_Abbreviation: h11441.asc
Source_Used_Citation_Abbreviation: h11442.asc
Process_Date: 2009
Source_Produced_Citation_Abbreviation: h11441.asc
Source_Produced_Citation_Abbreviation: h11442.asc
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Process_Step:
Process_Description:
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.
Source_Used_Citation_Abbreviation: h11441.asc
Source_Used_Citation_Abbreviation: h11442.asc
Process_Date: 2009
Source_Produced_Citation_Abbreviation: h11441.dtm
Source_Produced_Citation_Abbreviation: h11442.dtm
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Process_Step:
Process_Description:
The DTM files from surveys H11441 and H11442 (now 25 cm deeper) and surveys H11224 and H11225 were combined into one 4-m grid file using the Fledermaus command line option dtmmerge and the combined H11441-H11442-H11224-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 4-meter 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 h11224.dtm h11441.dtm h11442.dtm -out nlnb.dtm -cellsize 4.0 -mode average
Source_Used_Citation_Abbreviation: h11441.dtm
Source_Used_Citation_Abbreviation: h11442.dtm
Source_Used_Citation_Abbreviation: h11224.dtm
Source_Used_Citation_Abbreviation: h11225.dtm
Process_Date: 2009
Source_Produced_Citation_Abbreviation: nlnb.asc
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02453-1598
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Process_Step:
Process_Description:
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).
Source_Used_Citation_Abbreviation: nlnb.asc
Process_Date: 2009
Source_Produced_Citation_Abbreviation: nlnb_geo
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Bill Danforth
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Raod
City: Woods Hole
State_or_Province: MA
Postal_Code: 02453-1598
Contact_Voice_Telephone: 508-548-8700 x2274
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: bdanforth@usgs.gov
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Raster
Raster_Object_Information:
Raster_Object_Type: Grid Cell
Row_Count: 3328
Column_Count: 6267
Vertical_Count: 1
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000043
Longitude_Resolution: 0.000043
Geographic_Coordinate_Units: Decimal degrees
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: 0.1
Depth_Distance_Units: meters
Depth_Encoding_Method: Explicit depth coordinate included with horizontal coordinates
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
A 4-m grid of the combined multibeam and LIDAR bathymetry from NOAA surveys H11441, H11442, H11224, and H11225 in a geographic coordinate system.
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Person: Larry Poppe
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2314
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: lpoppe@usgs.gov
Resource_Description: Downloadable Data
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCG
Format_Specification: ESRI ArcRaster Grid
Format_Information_Content:
One file (nlnb_geo.zip) containing the ArcGIS grid file components, browse graphic and metadata.
File_Decompression_Technique: zip archive
Transfer_Size: 25.0
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<https://pubs.usgs.gov/of/2009/1231/data/bathy/grids/combined/nlnb_geo.zip>
Network_Resource_Name: <https://pubs.usgs.gov/of/2009/1231/html/catalog.html>
Access_Instructions: Data are downloadable via the World Wide Web (WWW).
Offline_Option:
Offline_Media: CD-ROM
Recording_Capacity:
Recording_Density: 640
Recording_Density_Units: Mbytes
Recording_Format: ISO9660
Fees: None
Technical_Prerequisites:
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.
Available_Time_Period:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2010
Metadata_Reference_Information:
Metadata_Date: 20091208
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Larry Poppe
Contact_Organization: U.S. Geological Survey
Contact_Position: Geologist
Contact_Address:
Address_Type: mailing and physical address
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598
Country: USA
Contact_Voice_Telephone: (508) 548-8700 x2314
Contact_Facsimile_Telephone: (508) 457-2310
Contact_Electronic_Mail_Address: lpoppe@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_Access_Constraints: None
Metadata_Use_Constraints: None
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile
Generated by mp version 2.9.6 on Tue Dec 08 07:04:10 2009