Bathymetric Survey of the Nearshore from Belle Pass to Caminada Pass, Louisiana: Methods and Data Report

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Nancy T. DeWitt
Originator: James G. Flocks
Originator: Mark Hansen
Originator: Mark Kulp
Originator: B.J. Reynolds
Publication_Date: 2007
Publication_Time: 2007
Title:

Bathymetric Survey of the Nearshore from Belle Pass to Caminada Pass, Louisiana: Methods and Data Report

Series_Information:

Series_Name: U. S. Geological Survey Data Series
Issue_Identification: 312, CD-ROM

Other_Citation_Details:

DeWitt, N.T., Flocks, J. G., Hansen, Mark, Kulp, Mark, Reynolds, B.J., 2007, Bathymetric Survey of the Nearshore from Belle Pass to Caminada Pass, Louisiana: Methods and Data Report: U.S. Geological Survey Data Series 312 CD-ROM. Also available online at <http://pubs.usgs.gov/ds/2007/312/>

Description:

Abstract:

The U.S. Geological Survey (USGS), in cooperation with the University of New Orleans (UNO) and the Louisiana Department of Natural Resources (LDNR), conducted a high-resolution, single-beam bathymetric survey along the southern Louisiana coastal zone from Belle Pass to Caminada Pass. The survey consisted of 483 line-kilometers of data acquired in July and August of 2005. This report outlines the methodology and provides the data from the survey. Analysis of the data and comparison to a similar bathymetric survey completed in 1989 show significant loss of seafloor and shoreline retreat, which is consistent with previously published estimates of shoreline change in the study area.

Purpose:

This project is a collection of high-resolution single-beam modern bathymetry data along the rapidly retreating Caminada-Moreau headland in the southern coastal zone, Louisiana, from Belle Pass eastward to Caminada Pass. These bathymetric data provide a 2005 dataset which succeeds a portion of the Louisiana Barrier Island Erosion Study: Atlas of Sea-Floor Changes from 1878 to 1989 by List and others (1994). The survey lines from Belle Pass to Caminada Pass (page 15 of the 1994 atlas) were digitized and resurveyed in 2005 in efforts to report sediment distribution (loss/gain) and shoreline transgression/regression along the Caminada-Moreau headland since the 1989 surveys.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 20050701
Ending_Date: 20050901

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -90.228836
East_Bounding_Coordinate: -89.995983
North_Bounding_Coordinate: 29.199592
South_Bounding_Coordinate: 29.009837

Keywords:

Theme:

Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:33a64c33-03ae-4d19-84af-5ae1725c0176

Theme:

Theme_Keyword_Thesaurus: ISO Topic Keywords 19115
Theme_Keyword: geoscientificinformation
Theme_Keyword: oceans

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: high-resolution bathymetry maps
Theme_Keyword: System for Accurate Nearshore Depth Surveying
Theme_Keyword: SANDS
Theme_Keyword: Global Positioning System
Theme_Keyword: GPS
Theme_Keyword: mapping
Theme_Keyword: survey
Theme_Keyword: depth
Theme_Keyword: bathymetric
Theme_Keyword: bathymetry
Theme_Keyword: navigation
Theme_Keyword: accuracy
Theme_Keyword: HYPACK
Theme_Keyword: GrafNav
Theme_Keyword: point data
Theme_Keyword: single beam
Theme_Keyword: hydrographic surveys
Theme_Keyword: HYPACK MAX
Theme_Keyword: Seafloor Atlas
Theme_Keyword: List and others, 1994
Theme_Keyword: Louisiana Department of Natural Resources
Theme_Keyword: LDNR
Theme_Keyword: United States Geological Survey
Theme_Keyword: USGS
Theme_Keyword: FISC - St. Petersburg, FL
Theme_Keyword: headland
Theme_Keyword: OPUS
Theme_Keyword: Gipsy
Theme_Keyword: Automated Gipsy
Theme_Keyword: SCOUT
Theme_Keyword: NAVD88
Theme_Keyword: NAD83
Theme_Keyword: UTM15
Theme_Keyword: Marimatech
Theme_Keyword: E-SEA-103

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Belle Pass
Place_Keyword: Caminada Pass
Place_Keyword: Caminada-Moreau headland
Place_Keyword: nearshore
Place_Keyword: southern Louisiana coastal zone
Place_Keyword: Louisiana
Place_Keyword: Fourchon

Access_Constraints:

Any use of these data signifies a user's agreement to insure all portions of the metadata are read and clearly understood before using these data in order to protect both user and the USGS interest.

Use_Constraints:

Acknowledgment of the USGS, Florida Integrated Science Center (FISC), St. Petersburg, FL, and the University of New Orleans, Department of Earth and Environmental Sciences, New Orleans, LA, as the source for the data would be appreciated in products developed from these data and such acknowledgements as is standard for citation and legal practices for data source is expected by users of this data. Users should be aware of comparisons with other datasets for the same area from other time periods which may be inaccurate due to inconsistencies resulting from different collection procedures, mapping procedures and lab or computer analysis. Although the USGS is making these datasets available to others who may find the data of value, USGS does not warrant, endorse, or recommend the use of this data for any given reason.

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nancy T. DeWitt
Contact_Organization: USGS

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 x3058
Contact_Facsimile_Telephone: 727-803-2030
Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Data_Set_Credit:

We would like to thank UNO and the LDNR for their partnership on this project.

Native_Data_Set_Environment:

Microsoft Windows XP version 2002 Service Pack 2; ESRI ArcCatalog 9.1 (build 750)

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The accuracy of the attributes (latitude, longitude, and depth) is dependent on the accuracies of the equipment used to measure their values. See horizontal and vertical positional accuracy for further information.

Logical_Consistency_Report:

A fixed 1-meter bar is used for calibrating the USGS fathometer for shallow water surveys. The 1-meter bar is sufficient, as most shallow water surveys are conducted in 3 meters of water or less, and a very accurate bar check is mandated. The USGS bar is attached to the boat directly below the transducers. The USGS bar consists of a 1.5-inch aluminum pipe connected horizontally to a flat plate which is anchored to the boat. Because of the short bar length, this check only accounts for index errors of the echo system and does not account for speed-of-sound variations with depth. In shallow water surveys the high sound velocity to depth ratio and the assumed mixing of the water tend to decrease the significance of sound velocity variations due to salinity and temperature gradients in the water column. For these reasons, using an average sound velocity of 1,500 meters per second (m/s) in combination with the daily bar check is suitable within the depth range of surveying. Full-phase-carrier GPS data are acquired simultaneously by the reference and boat receivers. Reference station GPS data are first used to derive reference station coordinates (latitude, longitude, elevation) and later used for kinematic processing of the boat GPS data. All kinematic data processing for this study were processed using GrafNav software by Waypoint, Inc. This processing step produces an accurate boat position and elevation at 1-second intervals, or about 10 feet (3 meters) apart along a track line.

Completeness_Report:

Data are complete. Surveys are conducted only during optimal weather conditions (surveying is not performed during storms or when winds are above 15 knots). Weather conditions, such as heavy storms, lightning storms, and heavy cloud cover, and water clarity affect the collection process. Surveying was halted when GPS cycle slips occurred or when Percent Dilution of Position (PDOP) values were greater than 3.0. These weather problems result in poor or inaccurate readings from the GPS unit. Any questionable data points are removed or reprocessed through the GPS processing software.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The accuracy of the horizontal positions (latitude and longitude) is based on the accuracy of the Ashtech dual-channel (Z-Xtreme), full-carrier-phase resolving geodetic differential GPS receivers.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: 4 ~ Boat centimeters RMS
Horizontal_Positional_Accuracy_Explanation:

The accuracy of horizontal position is based upon a measure of the GPS quality parameters: combined horizontal and vertical differences, RMS, PDOP, and quality flag. A bias of less than 1 centimeter is introduced by inaccuracies of the reference station absolute horizontal position. The accuracy of LIDAR data is based on ranging measurements, which are based on the time interval from the transmitted pulse to a point in the returned laser backscatter or waveform.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The accuracy of the vertical position is based on the accuracy of the Ashtech dual-channel (Z-Xtreme), full-carrier-phase resolving geodetic differential GPS receivers.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: 10 ~ Boat +/- centimeters RMS
Vertical_Positional_Accuracy_Explanation:

The accuracy of single-beam data is based on the crossing readings conducted during the surveying and a measure of the GPS quality parameters: combined horizontal and vertical differences, RMS, PDOP, and quality flag. In general, 85 percent of the soundings are better than +/- 6 centimeters RMS. A bias of less than 3 centimeters is introduced by inaccuracies of the reference station absolute vertical position.

Lineage:

Process_Step:

Process_Description:

Points containing x, y, and z (latitude, longitude, and depth) data are collected through a USGS-developed surveying system, the System for Accurate Nearshore Depth Surveying (SANDS). The SANDS system consists of a shallow draft boat equipped with two Ashtech Z-Xtreme GPS receivers which acquire full-phase-carrier signals from the NAVSTAR GPS constellation. The USGS SANDS utilizes Ashtech Z-Xtreme dual frequency, 12-channel full-carrier-phase GPS receivers. Dorne-Margolin type choke ring antennas are used at the reference station and on the boat. GPS acquisition interval is 1second (1 hertz). To minimize the adverse effects of vessel motion, the SANDS system is equipped with a TSS-DMS-05 heave, pitch, and roll compensator. Motion acquisition interval is 0.05 seconds (20 hertz). The scientific grade echosounder or fathometer used in the SANDS system is a Marimatech E-SEA-103. Sounding acquisition interval is 0.1 seconds (10 hertz). The boat is navigated and all sensor data acquired using Coastal Oceanographics Inc. HYPACK surveying software. The GPS data from the reference point (base station) and the GPS data from the boat (rover) are processed together using Waypoint Consulting, Inc., GrafNav GPS processing software, which produces the differential navigation file for the survey session. The USGS SANDS software merges this differential navigation file with all senor data based upon time, performs geometric corrections, and outputs final x, y, z data relative to NAVD88 via GEOID03. The x, y, z data are then imported into CPS-3 Software by Schlumberger and gridded at 135 grid node spacing. This grid node spacing corresponds with the gridded datasets from the 1980s survey outlined in List and others (1994).

Process_Date: 20050101 through 20061231
Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nancy T. DeWitt
Contact_Organization: USGS

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 x3058
Contact_Facsimile_Telephone: 727-803-2030
Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Process_Step:

Process_Description:

Added keywords section with USGS persistent identifier as theme keyword.

Process_Date: 20201013
Process_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: VeeAnn A. Cross

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: Mailing and Physical
Address: 384 Woods Hole Road
City: Woods Hole
State_or_Province: MA
Postal_Code: 02543-1598

Contact_Voice_Telephone: 508-548-8700 x2251
Contact_Facsimile_Telephone: 508-457-2310
Contact_Electronic_Mail_Address: vatnipp@usgs.gov

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.25722210100002

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Point Data
Entity_Type_Definition: Text Delimited File
Entity_Type_Definition_Source: CSV

Attribute:

Attribute_Label: X
Attribute_Definition: Easting
Attribute_Definition_Source: UTM Zone 15
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 770086.32
Range_Domain_Maximum: 791329.5

Attribute:

Attribute_Label: Y
Attribute_Definition: Northing
Attribute_Definition_Source: UTM Zone 15
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 3212872.26
Range_Domain_Maximum: 3233531.18

Attribute:

Attribute_Label: Z1
Attribute_Definition: elevation to NAVD88
Attribute_Definition_Source: NAVD88
Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: -14.55
Range_Domain_Maximum: -0.16

Attribute:

Attribute_Label: line_name
Attribute_Definition: track line name as named by HYPACK Software
Attribute_Definition_Source: HYPACK version 4.3
Attribute_Domain_Values:

Codeset_Domain:

Codeset_Name: ###_####
Codeset_Source:

First 3 numbers represent the number of the line and the last 4 numbers represent the time at which the line was aquired.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nancy T. DeWitt
Contact_Organization: USGS

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 x3058
Contact_Facsimile_Telephone: 727-803-2030
Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Resource_Description: Digital Data
Distribution_Liability:

THIS INFORMATION IS DISTRIBUTED SOLELY FOR THE PURPOSE OF PREDISSEMINATION PEER REVIEW UNDER APPLICABLE INFORMATION QUALITY GUIDELINES. IT HAS NOT BEEN DISSEMINATED BY USGS. IT DOES NOT REPRESENT AND SHOULD NOT BE CONSTRUED TO REPRESENT ANY DETERMINATION OR POLICY OF THE DEPARTMENT OF THE INTERIOR. Although these data have been processed successfully on a computer system at the designated principal investigator's facility, 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 or aggregate use with other data. It is strongly recommended that these data are directly acquired from the official USGS integrated science data server or from the principal investigator and not indirectly through other sources which may have changed the data in some way. It is also strongly recommended that careful attention be given to the contents of the metadata file associated with these data. The Principal investigator shall not be held liable for improper or incorrect use of the data described and (or) contained herein. So, these data are provided as is and without any expressed or implied warranties. In addition, use of trade names or commercial products in the metadata file is solely for providing specific information, and does not imply recommendation or endorsement. Any downloading and use of these data signifies a user's agreement to comprehension and compliance of the disclaimer. Insure all portions of the metadata are read and clearly understood before using the data in order to protect both user and principal investigator's interests.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: CSV
Format_Version_Number: CSV
Format_Specification: Text delimited file
Format_Information_Content: Point data file
File_Decompression_Technique: no compression applied
Transfer_Size: 5.5 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: http://pubs.usgs.gov/ds/577/software/arc.zip

Offline_Option:

Offline_Media: CD-ROM
Recording_Format: CD-RW

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20210922
Metadata_Review_Date: 20070516
Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Nancy T. DeWitt
Contact_Organization: USGS

Contact_Position: Marine Geologist
Contact_Address:

Address_Type: mailing and physical address
Address: 600 4th St. South
City: St. Peterbsurg
State_or_Province: FL
Postal_Code: 33701
Country: USA

Contact_Voice_Telephone: 727-803-8747 x3058
Contact_Facsimile_Telephone: 727-803-2030
Contact_Electronic_Mail_Address: ndewitt@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_Extensions:

Profile_Name: ESRI Metadata Profile

This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/ds-312metadata.html>