Hudson River Estuary Seismic gif Images

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Robin Bell
Originator: Suzanne Carbotte
Originator: Frank Nitsche
Originator: William Ryan
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2002
Title: Hudson River Estuary Seismic gif Images
Geospatial_Data_Presentation_Form: profile
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Department of Environmental Conservation
Description:
Abstract:
This report consists of two-dimensional marine seismic reflection profile data from the Hudson River Estuary. The data are available in binary and GIF image formats. Binary data are in Society of Exploration Geologists (SEG) SEG-Y format and may be downloaded for further processing or display. GIF images of the profiles may be viewed with your Web browser.
Purpose:
Seismic reflection data are used to image and map sedimentary and structural features of the estuary floor and subsurface. They have been crucial in defining areas of erosion or deposition that became fundamental classes in the sedimentary environment map.
Supplemental_Information:
Seismic reflection profiles are acquired by means of an acoustic source and receiver towed in the water behind the survey vessel. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), and detected at the receiver. As the vessel moves, this process is repeated at intervals of approx 0.83 meters. In this way a two-dimensional image of the geologic structure beneath the ship track is constructed. SEG-Y data can be used to generate images with vertical exaggeration different from the gif images. A free SEG-Y viewer for Windows SeisVu can be obtained at <http://www.phoenixdatasolutions.co.uk/>. More information and software for Windows and Macs can be obtained at <http://energy.cr.usgs.gov/nersl/index.html>.
The SB 4_24 tow fish, manufactured by Edge Tech of Boca Raton, Florida, was the source/receiver used in these surveys. This is a Chirp or swept frequency sonar system, which emits a broadband FM source pulse with low frequencies providing depth penetration into the subbottom and higher frequencies providing high vertical resolution. The X-Star acquisition unit controls all data transmission, recording and signal processing including Analogue to Digital (A to D) conversion, compression of the FM pulse and spherical divergence correction. The recorded signal is the output of the correlation filter used for pulse compression and is stored in SEG-Y format.
PEER REVIEWED PUBLICATIONS
- Bell, R.E., R.D. Flood, S. Carbotte, W.B.F. Ryan, C. McHugh, M. Cormier, R. Versteeg, H. Bokuniewicz, V.L. Ferrini, J. Thissen, J.W. Ladd, E. A. Blair, 2006, Benthic habitat mapping in the Hudson River Estuary, in J. Levinton and J. Waldman(editors), The Hudson River Estuary, Cambridge Univ Press., pp 51-64.
- Carbotte, S.M., R.E. Bell, W.B.F. Ryan, C. McHugh, A. Slagle, F.O. Nitsche , J. Rubenstone, 2004, Environmental change and oyster colonization within the Hudson River estuary linked to Holocene climate, Geo-Marine Letters, 24, 212-224.
- McHugh, C.M.G., Pekar, S.F., Christie-Blick, N., Ryan, W.B.F., Carbotte, S., Bell, R., 2004. Spatial variations in a condensed interval between estuarine and open marine settings: Holocene Hudson River Estuary and adjacent continental shelf, Geology, 32 (2): 169-172.
- Nitsche, F.O., Bell, R., Carbotte, S.M., Ryan, W.B.F., Flood, R., 2004. Process-related classification of acoustic data from the Hudson River Estuary, Marine Geology, 209(1-4): 131-145.
- Nitsche, F.O. R. Bell, S.M. Carbotte, W.B.F. Ryan, A. Slagle, S. Chillrud, T. Kenna, R. Flood, V. Ferrini, R. Cerrato, C. McHugh, D. Strayer, 2005, Integrative acoustic mapping reveals Hudson River sediment processes and habitats, EOS 86(24), pp
- Nitsche, F.O., S. Carbotte, W.B.F. Ryan and R. Bell, 2005, A seabed classification approach based on multiple acoustic sensors in the Hudson River Estuary, in D.M. FitzGerald and J. Knight (editors) High Resolution Morphodynamics and Sedimentary Evolution of Estuaries: Springer, pp 33-55.
- Nitsche, F.O., W.B.F. Ryan, S.M. Carbotte, R.E. Bell, A. Slagle, C. Bertinado, R. Flood, T. Kenna, C. McHugh, 2007, Regional patterns and local variations of sediment distribution in the Hudson River Estuary, Estuarine, Coastal and Shelf Science, 71, 259-277.
- Pekar, S.F., McHugh, C.M.G., Christie-Blick, N., Jones, M., Carbotte, S.M., Bell, R.E., Lynch-Stieglitz, J., 2004, Estuarine processes and their stratigraphic record: paleosalinity and sedimentation changes in the Hudson Estuary (North America), Marine Geology, 209(1-4): 113-129.
- Slagle, A.L., W.B.F. Ryan, S.M. Carbotte, R. Bell, F.O. Nitsche, and T. Kenna. 2006, Late-stage estuary infilling controlled by limited accommodation space in the Hudson River. Marine Geology, Volume 232, Issues 3-4, Pages 181-202.
- Strayer, D.L., M.M. Malcolm, R.E. Bell, S.M. Carbotte, F.O. Nitsche, 2006, Using geophysical information to define benthic habitats in a large river, Freshwater Biology 51, 25?38
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 1998
Single_Date/Time:
Calendar_Date: 2003
Currentness_Reference:
Data assumed to be constant over time, but may change due to geologic processes.
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -74.083759
East_Bounding_Coordinate: -73.685668
North_Bounding_Coordinate: 42.7478
South_Bounding_Coordinate: 40.605771
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: seismic reflection
Theme_Keyword: sediments
Theme_Keyword: subbottom
Theme_Keyword: profiles
Theme_Keyword: acoustic
Theme_Keyword: gif
Theme_Keyword: river
Theme_Keyword: estuary
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Hudson River Estuary
Place_Keyword: New York State
Access_Constraints: None. These data are held in the public domain.
Use_Constraints:
None; Lamont-Doherty Earth Observatory of Columbia University requests to be acknowledged as the originator of the data in future products or derivative research.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Robin Bell
Contact_Organization: Lamont-Doherty Earth Observatory of Columbia University
Contact_Address:
Address_Type: mailing address
Address: Lamont-Doherty Earth Observatory, 61 Route 9W
City: Palisades
State_or_Province: NY
Postal_Code: 10964-8000
Country: USA
Contact_Voice_Telephone: (845) 365-8827
Contact_Electronic_Mail_Address: robinb@ldeo.columbia.edu
Data_Set_Credit:
Robin Bell, William Ryan, Suzanne Carbotte, Frank Nitsche, Lamont-Doherty Earth Observatory of Columbia University
Cross_Reference:
Citation_Information:
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2005
Title: Hudson River Estuary Benthic Survey Index
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYS DEC
Cross_Reference:
Citation_Information:
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2003
Title:
Hudson River Estuary Sidescan and Seismic Track Navigation ascii
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYS DEC
Cross_Reference:
Citation_Information:
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2003
Title:
Hudson River Estuary Sidescan and Seismic Track Line Information
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYS DEC
Cross_Reference:
Citation_Information:
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2006
Title: Hudson River Estuary Seismic Shotpoints
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYS Dept Environmental Conservation
Cross_Reference:
Citation_Information:
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2002
Title: Hudson River Estuary Seismic Profile Data SEG-Y
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: New York State Dept of Environmental Conservation
Cross_Reference:
Citation_Information:
Originator: William Ryan
Originator: Lamont-Doherty Earth Observatory of Columbia University
Publication_Date: 2005
Title: Hudson River Estuary Sediment Environment Map
Series_Information:
Series_Name: Hudson River Estuary Program
Issue_Identification: Benthic Mapping Project
Publication_Information:
Publication_Place: Albany, NY
Publisher: NYS DEC

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The validity or accuracy of seismic reflection profiles is highly qualitative, and depends on equipment and operating condition variables too numerous to quantify. There have been no efforts to assess the validity of the data.
Logical_Consistency_Report: These data have not been assessed for internal consistency.
Completeness_Report:
These are sparse line coverages (2D). Therefore, data are inherently incomplete. Geologic details between lines must be inferred.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Positions were determined with differential Global Positioning System (GPS). Absolute position accuracy was approximately ± 1 m.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
The acoustic source/receiver fish was kept more or less at a constant depth of ~0.5 meters. The datum (NADV88) is between low and high tide. Depending on the tidal cycle the fish was above or below this datum. Therefore, the correction value (found in the ascii position files) will sometime be positive, sometimes negative to correct for this.
Lineage:
Process_Step:
Process_Description:
NAVIGATION GPS navigation data were acquired from a pair of Ashtech Z-12 (dual-frequency 12-channel Y-Code) geodetic-quality GPS receivers, operated continuously at 2 Hz. One receiver was located on the ship and one was located at a fixed basestation at LDEO. The GPS data are postprocessed with the KARS (Kinematic and Rapid Static) software package developed by G.Mader at the National Geodetic Survey (NGS). We solve for the relative position of the ship at each epoch with respect to the fixed basestation, which has been precisely located from a static solution with nearby stations in the CORS (Continuously Operated Reference Stations) network, and precise satellite orbit data obtained from the Crustal Dynamics Data Information System (CDDIS) archive. Differential processing allows us to remove clock errors and orbit errors which are common to both receivers. The tropospheric delay is modeled, and the ionospheric error is reduced by using both the L1 and L2 frequency observables. KARS uses an optimized integer-search algorithm to resolve initial satellite ambiguities and detect cycle slips. Final pseudorange corrected positions are accurate to 0.5 meters.
Process_Date:
1998-2003 (Processing step was done in real time during data acquisition and was, therefore, done on various dates as shown in the attribute tables for hr_track and hr_seismic_shotpoints)
Process_Step:
Process_Description:
Data collected using EdgeTech CHIRP 424 (4-24kHz) Data have been merged with corrected navigation and corrected for tides. General scaling of amplitudes and image generation via Seismic Unix.
Process_Date:
1998 and later (data processing at various times post-acquisition)

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
The naming convention for profiles is as follows: the first two characters (letter and digit) refer to a survey area as defined in the Hudson River Estuary Benthic Survey Index. The third character (e,w,n,s) designates the direction from which the line was shot (e-east to west, w-west to east, n-north to south, s-south to north). The remainder of the name is the line number in the survey area. Horizontal X and Y locations for each shot location are provided in ASCII position files and ESRI shape files. Shot Points (tracenumbers) are annotated on the horizontal axis of the gif images. Two-way travel time (seconds) is annotated on the vertical axis of the gif images.

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.00001
Longitude_Resolution: 0.00001
Geographic_Coordinate_Units: decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: WGS 84
Ellipsoid_Name: WGS 84
Semi-major_Axis: 6378137 m
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview: Graphic image file: Each profile is available as a GIF image.
Entity_and_Attribute_Detail_Citation: Lamont-Doherty earth Observatory of Columbia University

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Ladd
Contact_Organization: Hudson River National Estuarine Research Reserve
Contact_Position: benthic mapping coordinator
Contact_Address:
Address_Type: mailing address
Address: Norrie Point Environmental Center
City: Staatsburg
State_or_Province: NY
Postal_Code: 12580
Country: USA
Contact_Voice_Telephone: 845-889-4745
Contact_Electronic_Mail_Address: jxLadd@gw.dec.state.ny.us
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.

Metadata_Reference_Information:
Metadata_Date: 20080101
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Ladd
Contact_Organization: Hudson River National Estuarine Research Reserve
Contact_Position: benthic mapping coordinator
Contact_Address:
Address_Type: mailing address
Address: Norrie Point Environmental Center
Address: PO Box 315
City: Staatsburg
State_or_Province: NY
Postal_Code: 12580
Country: USA
Contact_Voice_Telephone: 845-889-4745
Contact_Electronic_Mail_Address: jxLadd@gw.dec.state.ny.us
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.9.5 on Fri Mar 07 11:59:46 2008