Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana

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Frequently anticipated questions:

What does this data set describe?

Title:
Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana
Abstract:
As a part of the Barrier Island Comprehensive Monitoring Program (BICM), scientists from the U.S. Geological Survey (USGS) St. Petersburg Coastal and Marine Science Center conducted a nearshore single-beam bathymetry survey along the Chenier Plain, Louisiana from Marsh Island to Sabine Pass. The goal of the BICM program is to provide long-term data on Louisiana's coastline and use this data to plan, design, evaluate, and maintain current and future barrier island restoration projects. The data described in this metadata record will provide baseline bathymetric information for future research investigating island evolution, sediment transport, recent- and long-term geomorphic change and will support modeling of future changes in response to restoration and storm impacts. Over 3,300-line kilometers of single-beam data were acquired during two field missions: USGS Field Activity numbers (FAN) 2017-323-FA, conducted June 2-14, and 2017-324-FA, which occurred July 8-16, 2017 aboard four separate survey vessels. The final x,y,z data are provided in the native World Geodetic System of 1984 (WGS84) G1150 acquisition format (which is equivalent to the International Terrestrial Reference Frame of 2000 [ITRF00]), with values ranging from -26.62 m to -68.94 m ellipsoid height, as well as the North American Datum of 1983 (NAD83) reference frame and the North American Vertical Datum of 1988 (NAVD88) GEOID12A , with values ranging from 0.00 to -30.13 m.
Supplemental_Information:
For the single-beam bathymetry, the differential positioning was obtained through post processing the base station data to the rover data. This dataset was transformed from the initial datum ITRF00 to NAD83 using the GEOID12A model (NOAA NGS VDatum software version 3.2 - http://vdatum.noaa.gov/).
  1. How might this data set be cited?
    Stalk, Chelsea A., Flocks, James G., Bernier, Julie C., DeWitt, Nancy T., Fredericks, Jake J., Kelso, Kyle W., Farmer, Andrew S., Tuten, Thomas M., and Wilcox, Hunter S., 20180628, Nearshore Single-Beam Bathymetry XYZ Data Collected in 2017 from the Chenier Plain, Louisiana: U.S. Geological Survey Data Release doi:10.5066/F7CV4GZH, U.S. Geological Survey, St. Petersburg, FL.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -93.831975
    East_Bounding_Coordinate: -91.749388
    North_Bounding_Coordinate: 29.776323
    South_Bounding_Coordinate: 29.434433
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 02-Jun-2017
    Ending_Date: 16-Jul-2017
    Currentness_Reference:
    ground condition
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: tabular digital data
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    Chenier_Plain_2017_SBB_Level_03B_xxx_ITRF00.txt
    Comma-Separated Values (CSV) file containing processed single-beam bathymetry x,y,z data collected in 2017, during the Chenier Plain (Louisiana) survey. Data were acquired in WGS84 (G1150), which is equivalent to ITRF00. (Source: USGS)
    ITRF00_X
    WGS84 (ITRF00) X-coordinate (easting) of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:419507.981
    Maximum:621271.670
    Resolution:0.001
    ITRF00_Y
    WGS84 (ITRF00) Y-coordinate (northing) of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:3256693.907
    Maximum:3294026.130
    Resolution:0.001
    Ellipsoid
    WGS84 (G1150) ellipsoid height of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:-68.939
    Maximum:-26.619
    Resolution:0.01
    ITRF00_Lat
    WGS84 (ITRF00) latitude of sample point, in decimal degrees. (Source: OPUS)
    Range of values
    Minimum:29.434433
    Maximum:29.776323
    Resolution:0.000001
    ITRF00_Long
    WGS84 (ITRF00) longitude of sample point, in decimal degrees. (Source: OPUS)
    Range of values
    Minimum:-93.831975
    Maximum:-91.749388
    Resolution:0.000001
    Year
    Year data were acquired in YYYY format. (Source: HYPACK)
    Range of values
    Minimum:2017
    Maximum:2017
    DOY
    Julian day, day of year (DOY) the data were acquired. (Source: HYPACK)
    Range of values
    Minimum:153
    Maximum:197
    Resolution:1
    UTCTime
    Coordinated Universal Time (UTC) assingned to each data point durring acquisition. (Source: HYPACK) HH:MM:SS.SSS
    HypackLine
    Line identification assigned by Hypack durring acquisition. (Source: HYPACK) Vessel FAN_line number_UTC time of the start of the line
    Chenier_Plain_2017_SBB_Level_03B_xxx_NAD83_NAVD88_G12A.txt
    CSV file containing processed single-beam bathymetry x,y,z data from the 2017 Chenier Plain survey. This dataset has been transformed from the original ITRF00 datum to NAD83 NAVD88 using the geoid model 2012A (GEOID12A). (Source: USGS)
    NAD83_X
    NAD83 (2011) X-coordinate (easting) of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:419508.887
    Maximum:621272.532
    Resolution:0.001
    NAD83_Y
    NAD83 (2011)Y-coordinate (northing) of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:3256693.392
    Maximum:3294025.613
    Resolution:0.001
    NAVD88_G12A
    NAVD88 using GEOID12A height of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:-42.19
    Maximum:-0.00
    Resolution:0.01
    NAD83_Ellipsoid
    NAD83 ellipsoid height of sample point, in meters. (Source: OPUS)
    Range of values
    Minimum:-67.58
    Maximum:-25.25
    Resolution:0.01
    NAD83_Lat
    NAD83 (2011) latitude of sample point, in decimal degrees. (Source: OPUS)
    Range of values
    Minimum:29.4344281
    Maximum:29.7763184
    Resolution:0.000001
    NAD83_Long
    NAD83 (2011) longitude of sample point, in decimal degrees. (Source: OPUS)
    Range of values
    Minimum:-93.831975
    Maximum:-91.749379
    Resolution:0.000001
    Year
    Year data were acquired in YYYY format. (Source: HYPACK)
    Range of values
    Minimum:2017
    Maximum:2017
    DOY
    Julian day, day of year (DOY) the data were acquired. (Source: HYPACK)
    Range of values
    Minimum:153
    Maximum:197
    Resolution:1
    UTCTime
    Coordinated Universal Time (UTC) assigned to each data point during acquisition. (Source: HYPACK) HH:MM:SS.SSS
    HypackLine
    Line identification assigned by Hypack durring acquisition. (Source: HYPACK) Vessel FAN_line number_UTC time of the start of the line

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Chelsea A. Stalk
    • James G. Flocks
    • Julie C. Bernier
    • Nancy T. DeWitt
    • Jake J. Fredericks
    • Kyle W. Kelso
    • Andrew S. Farmer
    • Thomas M. Tuten
    • Hunter S. Wilcox
  2. Who also contributed to the data set?
    U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center (SPCMSC).
  3. To whom should users address questions about the data?
    Chelsea A. Stalk
    Cherokee Nation Technologies/U.S. Geological Survey - St. Petersburg Coastal and Marine Science Center
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727)502-8000 (voice)
    cstalk@usgs.gov

Why was the data set created?

Single-beam bathymetry data were collected in support of the BICM program along the Chenier Plain of Louisiana's coastline to provide current bathymetry and shoreline information, as well as supplement historical archives for change analysis. The goal of the BICM program is to provide long-term data along the Louisiana coastline and use this data to plan, design, evaluate and maintain current and future barrier island restoration projects.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2017 (process 1 of 7)
    GPS Acquisition: A total of 8 Geographic Positioning Systems (GPS) base stations were established throughout the survey area, 5 of which were located on NGS established marks, 1 on a USGS installed mark, and 2 on other marks within the Rockefeller National Wildlife Refuge. Located in the eastern portion of the survey area, NGS mark DN4165 is established at the mouth of the freshwater lock to the west of Marsh Island. USGS established mark MIGP, installed in 2016, is located on the western shore of Marsh Island. Near the middle of the survey area, RFS1 (markings Fish Lab 1), and ME18 were located on the grounds of the Rockefeller National Wildlife Refuge. In the western portion of the survey area, NGS mark DJ9378 is established near the northern grass edge of the boat ramp at the southern end of Calcasieu Pass, this mark was found damaged with a bent rod tip. Because of the damage, coordinates derived from survey occupations were used in final processing. NGS mark DH3817 is located off Highway 27 in Cameron city limits and mark AV0360 is located in Holly Beach on the grounds of the torn down church, near the stop sign. The most western NGS mark utilized is DN4168 which is located off highway 82 past the high school near the Sabine Pass Bridge. All base stations were occupied 24 hours and equipped with Ashtech Proflex GPS receivers recording 12-channel full-carrier-phase positioning signals (L1/L2) from satellites via Thales Choke-ring antennas, recording at a rate of 0.1 seconds (s). Person who carried out this activity:
    Chelsea A. Stalk
    Cherokee Nation Technologies/U.S. Geological Survey's St. Petersburg Coastal and Marine Science Center
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Date: 2017 (process 2 of 7)
    Single-Beam Bathymetry Acquisition: The single-beam bathymetric data were collected under the USGS Field Activity Numbers (FAN) 2017-323-FA and 2017-324-FA, which encompass data from four separate survey platforms; The RV Sallenger (17BIM01, 17BIM05), a 26-foot (ft) Parker, collected 1,202.80 line-km (378 Lines), RV Jabba Jaw (17BIM02, 17BIM07), a shallow draft 22-ft Twin Vee collected 906.87 line-km (338 lines), the RV Shark (17BIM03, 17BIM07), a 12-ft Yamaha Personal Water Craft (PWC) collected 568.64 line-km (174 lines), and the RV Chum (17BIM04, 17BIM08), an additional 12-ft Yamaha PWC collected 720.38 line-km (251 lines). Boat motion was recorded at 50-millisecond (ms) intervals using a Teledyne TSS Dynamic Motion Sensor (TSS DMS-05) on the R/V Sallenger, R/V Jabba Jaw, and by use of a SBG Ellipse A #1 motion sensor aboard each PWC. HYPACK (version 16.1.8.0), a marine surveying, positioning, and navigation software package, managed the planned-transect information and provided real-time navigation, steering, correction, data quality, and instrumentation-status information to the boat operator. Depth soundings were recorded at 50-ms intervals using an Odom echotrac CV100 sounder with a 200-kilohertz (kHz) transducer on all vessels. Data from the GPS receiver, motion sensor, and fathometer were recorded in real-time aboard all vessels independently and merged into a single raw data file (*.RAW) in HYPACK, with each device string referenced by a device identification code and time stamped to Coordinated Universal Time (UTC). Sound velocity profile (SVP) measurements were collected using four SonTek Castaway Conductivity, Temperature, and Depth (CTD) instruments as well as one Valport mini sound velocity profiler (SVP). The instruments were periodically cast overboard to observe changes in water column speed of sound (SOS). A total of 392 successful sound velocity casts were taken throughout the survey at an average depth of 5.06 meters, and on average produced a sound velocity of 1519.68 meters per second (m/s). Person who carried out this activity:
    Chelsea A. Stalk
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources produced in this process:
    • HYPACK raw (*.RAW ) data files were produced for each trackline surveyed. In addition, HYPACK target files for any targets (*.TGT) and speed of sound files (*.TXT) in text format were also recorded digitally, during data collection.
    Date: 2017 (process 3 of 7)
    Differentially Corrected Navigation Processing: The coordinate values of the GPS base stations are the time-weighted average of values obtained from the NGS?s OPUS. The base station coordinates were imported into GrafNav version 8.7 (Waypoint Product Group) and the kinematic GPS data from the survey vessel were post processed to the concurrent GPS session data at the base stations. During processing, steps were taken to ensure that the trajectories between the base and the rover were clean, resulting in fixed positions. By analyzing the graphs, trajectory maps, and processing logs that GrafNav produces for each GPS session, GPS data from satellites flagged by the program as having poor health or satellite time segments that had cycle slips could be excluded, or the satellite elevation mask angle could be adjusted to improve the position solutions. The final differentially corrected, precise DGPS positions were computed at 0.1s and exported in ASCII text format to replace the uncorrected rover positions recorded during acquisition. The GPS data were processed and exported in the WGS84 G1150 geodetic datum. Person who carried out this activity:
    Cherokee Nation Technologies/U.S. Geological Survey
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources produced in this process:
    • Post-processed differential navigation data for the rover (boat) were created in ASCII text format. Three files (forward, reverse, and combined trajectories) are produced for each GPS session file.
    Date: 2017 (process 4 of 7)
    Single-beam bathymetry processing: All data were processed using CARIS HIPS and SIPS (Hydrographic Information Processing System and Sonar Information Processing System) version 10.2.1. The raw HYPACK data files were imported into CARIS, the differentially corrected navigation files were imported using the generic data parser tool within CARIS, and any SVP profile casts were entered and edited using the SVP editor. The bathymetric data components (position, motion, depth, and SOS) were then merged and geometrically corrected in CARIS to produce processed x,y,z data. Next, the data were edited for outliers and then further reviewed in the Subset Editor utility for crossing status, and questionable data points or areas. The geometrically corrected point data were then exported as an x,y,z ASCII text file referenced to WGS84(G1150), equivalent to ITRF00, ellipsoid height in meters. Person who carried out this activity:
    Cherokee Nation Technologies/U.S. Geological Survey
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources used in this process:
    • Post-processed differential navigation data, raw HYPACK bathymetric data, and sound velocity data were all exported in ASCII text format.
    Data sources produced in this process:
    • 17BIM01_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM02_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM03_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM04_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM05_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM06_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM07_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM08_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt
    Date: 2017 (process 5 of 7)
    Quality Control and Quality Assurance (QA/QC): All single-beam data exported from CARIS were imported into Esri ArcMap version 10.3.1, where a shapefile of the individual data points (x,y,z) was created and plotted in 0.5-m color coded intervals. First, all data were visually scanned for any obvious outliers or problems. Next, a Python script was used to evaluate elevation differences at the intersection of crossing tracklines by calculating the elevation difference between points at each intersection using an inverse distance weighting equation. GPS cycle slips, stormy weather conditions, and rough sea surface states can contribute to poor data quality. In all cases where discrepancies in the data, or high (>0.30 m) crossing values were found, there was sufficient data coverage to delete the problem data points and/or lines. The script was run on all vessel point data first on a vessel by vessel basis and then run a final time for all data points from all vessels collectively within a merged file. A total of 4,406 crossing values were observed throughout the survey area, 95% of which are less than 0.30m. Once the dataset passed all QA/QC procedures and manual editing steps, the data were considered final and included in the download section of this data release. Person who carried out this activity:
    Cherokee Nation Technologies/U.S. Geological Survey
    Attn: Chelsea A. Stalk
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources used in this process:
    • 17BIM01_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM02_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM03_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM04_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM05_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM06_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM07_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt 17BIM08_SBB_Level_03_xxx_WGS84_ITRF00_UTM15N.txt
    Data sources produced in this process:
    • Chenier_Plain_2017_SBB_Level_03B_xxx_ITRF00.txt
    Date: 2017 (process 6 of 7)
    Datum Transformation: The text file, Chenier_Plain_2017_SBB_Level_03B_xxx_ITRF00.txt, was converted using NOAA?s VDatum software conversion tool version 3.6 (reported vertical transformation error is 7.6158 cm) from ITRF00 to the NAD83 reference frame and NAVD88 orthometric height using the National Geodetic Survey (NGS) geoid model of 2012A (GEOID12A). Person who carried out this activity:
    Chelsea A. Stalk
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
    Data sources used in this process:
    • Chenier_Plain_2017_SBB_Level_03B_xxx_ITRF00.txt
    Data sources produced in this process:
    • Chenier_Plain_2017_SBB_Level_03B_xxx_NAD83_NAVD88_G12A.txt
    Date: 13-Oct-2020 (process 7 of 7)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    The accuracy of the data is determined during data collection. Methods are employed to maintain data collection consistency aboard all survey platforms. During mobilization, each piece of equipment is isolated to obtain internal and external offset measurements with respect to the survey platform. All critical measurements are recorded manually and digitally and entered into their respective programs for calibration. Once calibration is complete and calibration status is considered acceptable, the survey operations commence. The single-beam systems on each survey platform have a dedicated computer, equipment and software versions for each system and platform were consistent at all times throughout the survey. Offsets between the single beam transducers, motion reference units, and the Ashtech antenna reference point (ARP) were measured and accounted for in post-processing. Differential Global Positioning System (DGPS) coordinates were obtained using post-processing software packages (NGS?s OPUS, and Waypoint Product Group GrafNav, version 8.7.
  2. How accurate are the geographic locations?
    All static base station sessions were processed through OPUS maintained by NOAA and the NGS. The OPUS solutions were entered into a spreadsheet to compute a final, time-weighted position (latitude, longitude, and ellipsoid height) for each base station. The time-weighted positions for all base stations occupying established NGS benchmarks (DN4165, DH3817, DN4168, AV0360, and DJ9378) were compared against the published NGS coordinates. The time-weighted positions at base stations DN4165, DH3817, and DN4168 were within 3 standard deviations of the published positions for each NGS mark (DN4165: +/-0.31 cm North, +/-0.27 cm East; DH3817: +/-0.66 cm North, +/-0.57 cm East; and DN4168: +/-0.29 cm North +/-0.25 cm East), and the published positions for those base stations were used in subsequent processing steps. The time-weighted positions at base stations AV0360 and DJ9378, however, varied by more than 3 standard deviations from the published coordinates. At these base stations, the time-weighted average coordinates computed from the survey occupations were used. The horizontal variability of the base station coordinates at AV0360 and DJ9378 as well as UGSG-installed mark MIGP, and other marks ME18, and RFS1, were determined by calculating the maximum difference of any individual occupation from the time-weighted average latitude and longitude values (MIGP: 0.00030 seconds latitude, 0.00021 seconds longitude; ME18: 0.00022 seconds latitude, 0.00014 seconds longitude; RFS1: 0.00036 seconds latitude, 0.00035 seconds longitude; AV0360: 0.0022 seconds latitude, 0.00044 seconds longitude; and DJ9378: 0.0029 seconds latitude, 0.00018 seconds longitude). Continuously Operating Reference Station (CORS) station TXPT data were also utilized, reported horizontal error equals +/-1.2 cm east and north.
  3. How accurate are the heights or depths?
    All static base station sessions were processed through OPUS, which is maintained by NOAA and the NGS. The OPUS solutions were entered into a spreadsheet to compute a final, time-weighted position (latitude, longitude, and ellipsoid height) for each base station. The time-weighted positions for all base stations occupying established NGS marks (DN4165, DH3817, DN4168, AV0360, and DJ9378) were compared against the published NGS coordinates. The time-weighted positions at base stations DN4165, DH3817, and DN4168 were within 3 standard deviations of the published positions for each NGS mark (DN4165: +/-0.97 cm; DH3817: +/-2.80 cm; and DN4168: +/-0.98 cm), and the published positions for those base stations were used in subsequent processing steps. The time-weighted positions at base stations AV0360 and DJ9378, however, varied by more than 3 standard deviations from the published coordinates. At these base stations, the time-weighted average coordinates computed from the survey occupations were used. The vertical variability of the base station coordinates at AV0360 and DJ9378 as well as UGSG-installed mark MIGP, and other marks ME18, and RFS1, were determined by calculating the maximum difference of any individual occupation from the time-weighted average ellipsoid height values (MIGP: +/-2 cm; ME18: +/-3.2 cm; RFS1: +/-2.7 cm; AV0360: +/-1.4 cm; and DJ9378: +/-1.4 cm). CORS station TXPT data were also utilized, reported vertical error equals +/- 0.4 cm ellipsoid height.
  4. Where are the gaps in the data? What is missing?
    This dataset is considered complete for the information presented, as described in the abstract section. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    These datasets are from two field efforts with consistent instrument calibrations.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints:
The U.S. Geological Survey requests that it be referenced as the originator of this dataset in any future products or research derived from these data. These data should not be used for navigational purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    Chelsea A. Stalk
    Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
    Researcher I
    600 4th Street South
    St. Petersburg, FL
    USA

    (727) 502-8000 (voice)
    cstalk@usgs.gov
  2. What's the catalog number I need to order this data set? Chenier_Plain_2017_SBB_Level_03B_xxx_ITRF00.txt, Chenier_Plain_2017_SBB_Level_03B_xxx_NAD83_NAVD88_G12A.txt
  3. What legal disclaimers am I supposed to read?
    This publication was prepared by an agency of the United States Government. Although these data were processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S. Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    The ASCII text files contained in the .zip archive can be accessed with any standard text file reader.

Who wrote the metadata?

Dates:
Last modified: 13-Oct-2020
Metadata author:
Chelsea A. Stalk
Cherokee Nation Technologies/U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Researcher I
600 4th Street South
St. Petersburg, FL
USA

(727) 502-8000 (voice)
cstalk@usgs.gov
Metadata standard:
Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/spcmsc/Chenier_Plain_2017_SBB_XYZ_metadata.faq.html>
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