Short Citation:
Office for Coastal Management, 2021: Side-Scan-Sonar Points for Hudson River, NY, https://www.fisheries.noaa.gov/inport/item/47921.

Item Identification

Title: Side-Scan-Sonar Points for Hudson River, NY
Short Name: ny_hr09_sss-points-meta
Status: Completed
Publication Date: 2012
Abstract:

Side Scan Point Files. These points correspond to individual pings which produced hte side-scan-sonar backscatter imagery. Sonar data were collected November 6 to December 15, 2009, in the estuary north from Saugerties to Troy. Data Collection and Processing: The interferometric system used to measure acoustic reflectivity, provided a quantitative measure of reflectivity for every square meter of the survey area. Fugro's system measured and recorded acoustic reflectivity that has a high dynamic range such that the full range of reflectivity's encountered in the estuary environment can be recorded while maintaining a constant gain setting on the system receiver. Reflectivity data from the GeoSwath was used to produce a normalized as well as a classified image of the bottom. Additionally, Fugro provided slope, aspect and hillshade models as additional acoustic parameters. Backscatter data processing was completed with CARIS 7.0. Raw XTF files were created by converting Hypack format (*.HSX) into Triton format (*.XTF). Points were exported from the raw XTF files at an interval of 400 pings (approximately 100 meters).

Original contact information:

Contact Name: John Ladd

Contact Org: Hudson River National Estuarine Research Reserve, NYS DEC

Phone: 845-889-4745

Email: jxLadd@gw.dec.state.ny.us

Purpose:

Our work was consistent with the Statement of Work prepared by the New York State Department of Environmental Conservation (NYSDEC) to develop detailed bathymetric maps, acoustic reflectivity and acoustic character maps of the shallow portions of the Hudson River Estuary from the Verrazano Narrows north to the federal dam in Troy. In addition NYSDEC requested the collection of grab samples and 100 sediment cores at least one meter in length distributed throughout the same shallow portions of the Estuary. This project was being conducted as part of the Hudson River Estuary Action Plan promulgated by NYSDEC and approved by the Governor in 1996 which committed the State to, among other things, -Conduct a submerged habitat inventory to define areas most in need of protection for Hudson River fish, blue crab, and food chain species. -To conserve, protect, and, where possible, enhance critical river and shoreline habitats to assure that the life cycles of key species are supported for human enjoyment and to sustain a healthy ecosystem. -To conserve for future generations the rich diversity of plants, animals and habitats that are key to the vitality, natural beauty and environmental quality of the Hudson River Valley. Previous work in the Estuary was limited, in that detailed bathymetry was not acquired in areas of the estuary shallower than about 4 meters due to financial constraints. About a third of the estuary was not surveyed this third is the area that is home to important submerged aquatic vegetation (SAV) beds which sustain much of the biologic community in the estuary. Utilizing advanced technology and the experience of the previous benthic mapping projects, this project provided NYSDEC maps of the shallow areas that were not addressed with the previous studies. Pilot studies (Maher, 2006; Strayer et al., 2006; Yeung and McConnaughey 2008) have indicated that variations in remote sensing acoustic data are strongly correlated to variations in benthic macro invertebrate communities. This primary goal of this project, guided by NYSDEC, was to acquire acoustic data in the shallow water areas of the estuary that would facilitate classification of the substrate into biologically significant units.

Notes:

10078

Supplemental Information:

Geographic limits of the project survey covered some or all shallow areas of the estuary from the Verrazano Narrow Bridge north to the federal dam at Troy. The landward limit of surveys along the eastern shore of the estuary was the low tide line or the railroad tracks that extend up the east shore of the estuary whichever was most westward on a given line of latitude including Schodack Creek north to Little Schodack Island. The landward limit of surveys along the western shore was the low tide line or the railroad tracks that extend up the west shore of the estuary whichever is most eastward on a given line of latitude except for tidal portions of tributaries such as the Binnen Kill north of Interstate 90 and Catskill Creek north of Bridge Street. For the purposes of this project the low-tide line will be the line of zero depth relative to mean lower low water (MLLW) depicted on NOAA charts 12347 and 12348.

Keywords

Theme Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Benthic
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Coastal
Global Change Master Directory (GCMD) Science Keywords Earth Science > Biosphere > Ecosystems > Marine Ecosystems > Estuary
ISO 19115 Topic Category geoscientificInformation
None Acoustic Reflectivity
None Aspect
None Backscatter
None Environmental Monitoring
None Hillshade
None River
None Shallow Water
None Slope
None Swath Bathymetry

Spatial Keywords

Thesaurus Keyword
Global Change Master Directory (GCMD) Location Keywords Continent > North America > United States Of America > New York
None Hudson River
None New York
None USA

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: Map (digital)
Distribution Liability:

New York State Department of Environmental Conservation provides these geographic data "as is." New York State Department of Environmental Conservation makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. New York State DEC further makes no warranty, either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on a computer system at New York State Department of Environmental Conservation, no warranty expressed or implied is made regarding the accuracy or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. It is strongly recommended that careful attention be paid to the contents of the metadata file associated with these data. New York State Department of Environmental Conservation shall not be held liable for improper or incorrect use of the data described and/or contained herein.

Data Set Credit: Patrick Nissen, Robbie Dame, Jeff Carothers, Gilbert Suarez, Cindy Pratt, Fugro

Support Roles

Data Steward

CC ID: 612850
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Distributor

CC ID: 612852
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Metadata Contact

CC ID: 612853
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Point of Contact

CC ID: 612851
Date Effective From: 2012
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address: coastal.info@noaa.gov
Phone: (843) 740-1202
URL: https://coast.noaa.gov

Extents

Currentness Reference: Publication Date

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 612856
W° Bound: -73.933415
E° Bound: -73.685283
N° Bound: 42.752057
S° Bound: 42.064507

Extent Group 1 / Time Frame 1

CC ID: 612855
Time Frame Type: Range
Start: 2009
End: 2010

Spatial Information

Spatial Representation

Representations Used

Vector: Yes

Vector Representation 1

CC ID: 612845
Point Object Present?: Yes
Point Object Count: 6537

Access Information

Security Class: Unclassified
Data Access Constraints:

None

Data Use Constraints:

None.

Distribution Information

Distribution 1

CC ID: 750579
Download URL: ftp://ftp.coast.noaa.gov/pub/benthic/Side_Scan_Sonar_Backscatter_Data/NY_HudsonRiver_sss-xtf.zip
Distributor:
File Name: Bulk Download
Description:

FTP download of data files.

URLs

URL 1

CC ID: 750581
URL: https://coast.noaa.gov
Name: NOAA's Office for Coastal Management (OCM) website
URL Type:
Online Resource
Description:

Information on the NOAA Office for Coastal Management (OCM)

Activity Log

Activity Log 1

CC ID: 612875
Activity Date/Time: 2017-03-30
Description:

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 612874
Activity Date/Time: 2017-11-14
Description:

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 717931
Activity Date/Time: 2018-02-08
Description:

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 750580
Activity Date/Time: 2018-04-11
Description:

Partial upload to move data access FTP links to Distribution Info and remove broken URLs.

Technical Environment

Description:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770

Data Quality

Horizontal Positional Accuracy:

Data are geo-referenced using a combination of differential GPS (DGPS) and PPK which results in a horizontal accuracy of <+/- 1 meter.

Completeness Report:

The data covers the area of the estuary north from Saugerties to Troy in areas of shallow water (defined as any part of the estuary covered by water at low tide and shallower than 5 meters relative to NAVD88). For the purpose of this project the low-tide line will be the line of zero depth relative to mean lower low water (MLLW) depicted on NOAA charts 12347 and 12348.

Conceptual Consistency:

The Kongsberg GeoSwath Plus System was used to provide swath bathymetry coverage of the riverbed in shallow water. The system uses interferometric sonar, generating short pulses of acoustic energy which propagate out from the transducers at the speed of sound in water, ensonifying a narrow strip of riverbed perpendicular to the vessel track. Side scan data was collected utilizing the GeoSwath's backscatter at 255 kHz. For positioning, Fugro conducted the survey operations using a combination of DGPS and PPK. The differentially corrected position from DGPS was transmitted to the POS MV (Position Orientation System for Marine Vessels) via ethernet at 25 Hz and recorded to a POS file to be processed in conjunction with the base station data. Final corrected positions are accurate to <+/- 1 meter. Geoswath and position data from the POS MV was recorded in Hypack 2009a.

Lineage

Process Steps

Process Step 1

CC ID: 612842
Description:

Using a data converter in Hypack, raw side scan sonar files were converted from Hypack's HSX format to Triton's XTF format reserving the 16-bit format.

For each line, every 400th ping was extracted from the *.xtf files along with the first and last ping to create the Sonar_Ping shapefile.

Process Date/Time: 2009-01-01 00:00:00

Process Step 2

CC ID: 612843
Description:

The point shapefile was brought into ArcGIS along with the sidescan tracklines file. The data was qc'd for accuracy. A spatial join was created between the sidescan point shapefile and the SBP trackline shapefile, so that the user can determine the corresponding subbottom .sgy file to a particular SSS point. If a subbottom line was not run concurrently with the sidescan line, the SSS_Line field in the attribute table was filled with 'xxx'. In the case where the sidescan data may have been collected over a longer distance than the subbottom data, the SSS_Line field will be completed with 'xxx' or with a subbottom file collected on a different day.

Process Date/Time: 2010-01-01 00:00:00

Child Items

Rubric scores updated every 15m

Rubric Score Type Title
Entity (ENT) ny_hr09_sss-points

Catalog Details

Catalog Item ID: 47921
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-14 12:57+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2019-07-02 15:17+0000
Metadata Record Published: 2018-04-11
Owner Org: OCM
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Next Review Date: 2019-04-12