47919
Hudson River Sub_Bottom Profile Data - Raw SEG-Y Files (*.sgy)
ny_hr09_sbp-segy-meta
Data Set
Published / External
37225
Benthic
Project
Completed
2010
Hudson River Estuary Shallow Water Surveys. Subbottom data was collected November 5 to December 15, 2009, in the estuary north from Saugerties to Troy. Data Collection and Processing: Subbottom Data - Fugro utilized the EdgeTech SB216 Chirp subbottom profiler system for seismic data collection. This system was operated using a swept frequency range of 2-16 KHz, maximizing subsurface resolution within the very shallow near-surface material (1- 5 m beneath seafloor). Subbottom data was processed and interpreted using Discover and SMT Kingdom software. The intent of the processing was to provide the NYSDEC with SEG-Y files that were properly filtered and spatially oriented to allow for near-surface interpretation of sediments in the Hudson River. Processing steps for the subbottom data included swell filtering to compensate for sea conditions during survey operations, compiling correct shotpoint navigation, and adjusting data gains for optimal interpretation. An isopach (sediment thickness) of the unconsolidated surficial sediments was created from the seafloor and mapped sediment horizon base using an acoustic two-way travel time of 1500 meters/second. Subbottom data was used to assist in selecting sediment sampling locations. Graphical sub-bottom profiles for areas of interest were produced and descriptive results will be included in the final report. Points were created every 300th shot (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
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.
10076
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 was the line of zero depth relative to mean lower low water (MLLW) depicted on NOAA charts 12347 and 12348. The EdgeTech FS-SB subbottom profiler deployed during survey operations operated at a swept frequency range of 2-16 kHz. However, a transducer ping rate of 6-8 Hz (depending on water depths) corresponded to a hardware-applied data sampling interval of 40 microseconds. A built in anti-alias filter ensured a recorded frequency cut-off of 12 kHz. This is the maximum frequency that can be sampled at 40 microseconds, ensuring that no higher frequency events (above 12kHz) are aliased as a lower frequency event in the data. Given that high frequency events tend to rapidly attenuate in the water column and immediate subsurface, the lack of recorded frequencies above 12 kHz does not adversely impact data resolution (.02 meters estimated resolution for 16 kHz and .03 meters for 12 kHz) or subsurface mapping capabilities given the system's stated overall resolution (incorporating lower frequencies toward 2 kHz) of .1 meter.
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL
Theme
Global Change Master Directory (GCMD) Science Keywords
EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY
Theme
ISO 19115 Topic Category
environment
Spatial
Global Change Master Directory (GCMD) Location Keywords
CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > NEW YORK
Theme
Environment Monitoring
Theme
Subbottom, Profile, Chirp, Shallow Water, River
Spatial
Hudson River
Spatial
New York
Spatial
USA
Office for Coastal Management
Charleston
SC
Data Set
None Planned
Map (digital)
Sub bottom profile trace header data in SEG-Y format
Fugro
NOAA manages much of the data to users of digital geographic data.NOAA is in no way condoning or endorsing the application of this data for any given purpose.It is the sole responsibility of the user to determine whether or not the data is suitable for the intended purpose.It is also the obligation of the user to apply the data in an appropriate and conscientious manner.NOAA provides no warranty,nor accepts any liability occurring from any incomplete,incorrect, or misleading data, or from any incorrect,incomplete, or misleading use of the data.Much of the data is based on and maintained with ARC/GIS software developed by the Environmental Systems Research Institute (ESRI).In addition, much of the information presented uses conventions and terms popularized by ARC/GIS and its user community. NOAA in no way represents the interests of ESRI,nor acts as agents for them.
Patrick Nissen, Robbie Dame, Jeff Carothers, Gilbert Suarez, Cindy Pratt, Fugro
49330
SEG-Y headers
SEG-Y headers
Published / External
Completed
32-bit integer SEG-Y data format | Description Source: Fugro
Converted from FGDC using 'fgdc_to_inport_xml_entity.pl' script.
1
bytes_1_4
Unknown
No
No
Active
trace sequence number | Description Source: Fugro
Varies per line
2
bytes_17_20
Unknown
No
No
Active
shotpoint number | Description Source: Fugro
Varies per line
3
bytes_37_40
NUMBER
No
No
Active
distance from source point to receiver group | Description Source: Fugro
meter
0 - 0
4
bytes_49_52
NUMBER
No
No
Active
source depth below surface | Description Source: Fugro
meter
1 - 1
5
bytes_61_64
Unknown
No
No
Active
water depth at source (meters) | Description Source: Fugro
Varies per line
6
bytes_73_76
Unknown
No
No
Active
source x-coordinate (easting UTM WGS84 Zone 18N) | Description Source: Fugro
Varies per line
7
bytes_77_80
Unknown
No
No
Active
source Y-coordinate (northing UTM WGS84 Zone 18N) | Description Source: Fugro
Varies per line
8
bytes_115_116
Unknown
No
No
Active
number of samples in this trace | Description Source: Fugro
Varies per line
9
bytes_117_118
NUMBER
No
No
Active
sample interval in microseconds for this trace | Description Source: Fugro
microseconds
40 - 40
10
bytes_121_122
NUMBER
No
No
Active
instrument gain | Description Source: Fugro
0 - 0
11
bytes_127_128
NUMBER
No
No
Active
sweep frequency at start | Description Source: Fugro
kHz
2 - 2
12
bytes_129_130
NUMBER
No
No
Active
sweep frequency at end | Description Source: Fugro
kHz
16 - 16
13
bytes_131_132
NUMBER
No
No
Active
sweep length in microseconds | Description Source: Fugro
microseconds
20 - 20
14
bytes_141_142
NUMBER
No
No
Active
alias filter | Description Source: Fugro
kHz
12.5 - 12.5
15
bytes_157_158
NUMBER
No
No
Active
Year data recorded | Description Source: Fugro
2009 - 2009
16
bytes_159_160
Unknown
No
No
Active
day of year | Description Source: Fugro
Varies per line
17
bytes_161_162
Unknown
No
No
Active
hour of day | Description Source: Fugro
Varies per line
18
bytes_163_164
Unknown
No
No
Active
minute of hour | Description Source: Fugro
Varies per line. This value is recorded to the SEG-Y file header from the Sub bottom profiler PC clock which was offset from GPS time (as collected by the side scan sonar system).
19
bytes_165_166
Unknown
No
No
Active
second of minute | Description Source: Fugro
Varies per line. This value is recorded to the SEG-Y file header from the Sub bottom profiler PC clock which was offset from GPS time (as collected by the side scan sonar system).
20
bytes_167_168
NUMBER
No
No
Active
time basis code (1-local, 2-GMT, 3-other) | Description Source: Fugro
3 - 3
Data Steward
2010
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Distributor
2010
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Metadata Contact
2010
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Point of Contact
2010
Organization
NOAA Office for Coastal Management
NOAA/OCM
coastal.info@noaa.gov
2234 South Hobson Ave
Charleston
SC
29405-2413
(843) 740-1202
https://coast.noaa.gov
NOAA Office for Coastal Management Home Page
Online Resource
Publication Date
-73.933423
-73.685289
42.752039
42.06449
Discrete
2009
Yes
Unclassified
None
None
ftp://ftp.coast.noaa.gov/pub/benthic/Sub-Bottom_Profile_Data/NY_HudsonRiver_sbp.zip
Bulk Download
FTP download of data files.
2017-03-30
Date that the source FGDC record was last modified.
2017-11-14
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.
2018-02-08
Partial upload of Positional Accuracy fields only.
2018-04-11
Partial upload to move data access FTP links to Distribution Info and remove broken URLs.
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 3; ESRI ArcCatalog 9.3.0.1770
Data are geo-referenced using differential GPS (DGPS) which results in a lateral accuracy of <+/-1 meter.
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 purposes of this project the low-tide line was the line of zero depth relative to mean lower low water (MLLW) depicted on NOAA charts 12347 and 12348.
Fugro utilized the EdgeTech SB216 Chirp subbottom profiler system for seismic data collection. This system was operated using a swept frequency range of 2-16 KHz, maximizing subsurface resolution within the very shallow near-surface material (1- 5 m beneath seafloor). Position of the device was determined every second. After acquisition, navigation data was examined for outliers and applied to the subbottom profiler data to ensure proper positioning in the spatial domain.
1
The position recorded in the header of the SEG-Y file comes from the GPS navigation system interfaced to the sub bottom profiler computer, whereas the time comes from the sub bottom profiler computer clock. It has been determined that the time of the sub bottom profiler PC clock was offset from GPS time (as collected by the side scan sonar system). The positions found in the SEG-Y file headers and the SBP_points attribute tables represent the position of the subbottom profiler source at the GPS times for that position as found in the XTF headers and the Sidescan Sonar ping shape file attribute table. Users should not use time but rather geographic positions to compare the sub bottom profile and side scan sonar datasets. Subbottom data was processed and interpreted using Discover and SMT Kingdom software. The intent of the processing was to provide the NYSDEC with SEG-Y files that were properly filtered and spatially oriented to allow for near-surface interpretation of sediments in the Hudson River. Processing steps for the subbottom data included swell filtering to compensate for sea conditions during survey operations, compiling correct shotpoint navigation, and adjusting data gains for optimal interpretation. Ship GPS data were acquired using a Trimble AG332 GPS receiver, operating at 1 Hz. The GPS position of the sub bottom fish was calculated in the Discover software on the XStar topside processor by applying a layback (the offset of the towfish from the GPS antenna). The raw GPS data were viewed in ArcGIS for any outliers, and the processed data were applied to the SEG-Y files in Kingdom. Final corrected positions are accurate to <+/- 1 meter.
2010-01-01T00:00:00
2
The position recorded in the header of the SEG-Y file comes from the GPS navigation system interfaced to the sub bottom profiler computer, whereas the time comes from the sub bottom profiler computer clock. It has been determined that the time of the sub bottom profiler PC clock was offset from GPS time (as collected by the side scan sonar system). The positions found in the SEG-Y file headers and the SBP_points attribute tables represent the position of the subbottom profiler source at the GPS times for that position as found in the XTF headers and the Sidescan Sonar ping shape file attribute table. Users should not use time but rather geographic positions to compare the sub bottom profile and side scan sonar datasets. Subbottom data was processed and interpreted using Discover and SMT Kingdom software. The intent of the processing was to provide the NYSDEC with SEG-Y files that were properly filtered and spatially oriented to allow for near-surface interpretation of sediments in the Hudson River. Processing steps for the subbottom data included swell filtering to compensate for sea conditions during survey operations, compiling correct shotpoint navigation, and adjusting data gains for optimal interpretation. Ship GPS data were acquired using a Trimble AG332 GPS receiver, operating at 1 Hz. The GPS position of the sub bottom fish was calculated in the Discover software on the XStar topside processor by applying a layback (the offset of the towfish from the GPS antenna). The raw GPS data were viewed in ArcGIS for any outliers, and the processed data were applied to the SEG-Y files in Kingdom. Final corrected positions are accurate to <+/- 1 meter.
2010-01-01T00:00:00
49330
Entity
SEG-Y headers
gov.noaa.nmfs.inport:47919
Anne Ball
2017-11-14T12:57:38
SysAdmin InPortAdmin
2023-05-30T18:09:28
2018-04-11
Office for Coastal Management
OCM
1002
Public
No
2018-04-11
1 Year
2019-04-11