U.S. Geological Survey
20170508
Single-Beam Bathymetry Data Collected in 2015 nearshore Dauphin Island, Alabama, U.S. Geological Survey (USGS). These data are in the North American Datum 1983 (NAD83) for horizontal component, and the North American Vertical Datum 1988 (NAVD88) with respect to GEOID12A, and Mean Low or Lower Water (MLLW) for the vertical components.
Mulitmedia
https://doi.org/10.5066/F7BZ648W
Nancy T. DeWitt
Chelsea A. Stalk
James G. Flocks
Julie C. Bernier
Kyle W. Kelso
Jake J. Fredericks
Thomas Tuten
2017
Single-Beam Bathymetry Data Collected in 2015 nearshore Dauphin Island, Alabama.
multimedia presentation
U.S. Geological Survey Data Release
doi:10.5066/F7BZ648W
St. Petersburg, Florida
U.S. Geological Survey
https://doi.org/10.5066/F7BZ648W
Dauphin Island, Alabama is a barrier island located in the Gulf of Mexico that supports local residence, tourism, commercial infrastructure, and the historical Fort Gaines. During the past decade the island has been impacted by several major hurricanes (Ivan, 2004; Katrina, 2005; Isaac 2012). Storms along with sea level rise, presents a continued threat to island stability. State and federal managers are taking a scientific investigative approach to identify the best options available to formulate and implement a long-term plan to properly restore Dauphin Island and provide resilience against future storms and sea-level rise. Island morphology, including current bathymetry data, is one of several aspects being investigated and funded through a grant from National Fish and Wildlife Foundation Gulf Environmental Benefit Fund. In August 2015, the United States Geological Survey Saint Petersburg Coastal and Marine Science Center (USGS SPCMSC) in cooperation with the United States Army Corps of Engineers (USACE) and the state of Alabama conducted bathymetric surveys of the nearshore waters surrounding Dauphin Island. This data release provides 1,165-line kilometers (km) of processed single-beam bathymetry (SBB) data collected by the USGS SPCMSC in August 2015 (Field Activity Number [FAN] 2015-326-FA). Data were acquired aboard 4 separate survey vessels; the RV Sallenger (subFAN, 15BIM10), the RV Jabba Jaw (subFAN, 15BIM11), the RV Shark (subFAN, 15BIM12), and the RV Chum (subFAN, 15BIM13). The data are provided in three datums: 1) the International Terrestrial Reference Frame of 2000 (ITRF00), ellipsoid height (-47.04 meters [m] to -29.36 m); 2) the North American Datum of 1983, realization of CORS96 (NAD83 (CORS96)) horizontal, and the North American Vertical Datum 1988 (NAVD88) vertical (-0.24 m to -17.33 m); and 3) the NAD83 (CORS96) horizontal, and Mean Lower Low Water (MLLW) vertical (-0.12 m to -17.93 m). Additional files include trackline shapefiles, digital and handwritten Field Activity Collection Systems (FACS) logs, a comprehensive 50-meter Digital Elevation Model (DEM), and formal Federal Geographic Data Committee (FGDC) metadata.
This zip archive contains processed x,y,z data points for the single-beam bathymetry data (SBB) collected in August 2015 (FAN=2015-326-FA; SubFans=15BIM10, 15BIM11, 15BIM12 and 15BIM13) around Dauphin Island, Alabama. The processed single-beam soundings are provided as ASCII x,y,z point data.
The single-beam surveys were acquired and processed to a geodetic reference ellipsoid. The single-beam data was acquired using stand-alone GPS and then post-processed to obtain Differential Global Positioning System DGPS navigation. All single-beam surveys were referenced to WGS84 (G1150)/ITRF00. The final x,y,z position data from each survey were merged to generate a digital elevation model (DEM) with a cell-size resolution of 50 meters.
20150819
20150825
ground condition
None planned
-88.395035
-88.037688
30.271956
30.190155
USGS Metadata Identifier
USGS:5cfc2d26-faa3-4bfe-bf03-8dedb2806928
ISO 19115 Topic Category
oceans
elevation
location
geoscientificInformation
imageryBaseMapsEarthCover
USGS Thesaurus
marine geology
geophysics
bathymetry
single-beam echo sounder
field monitoring stations
digital elevation models
None
trackline
bathymetry
USGS
shapefile
HYPACK
single-beam bathymetry
base station
benchmark
West Dauphin Island (WDAU) Benchmark
NGS (National Geodetic Survey) Permanent Identifier (PID) BH1755
kinematic
shoreline
hydrography
ODOM Echotrach CV-100
ODOM
TSS Motion Sensor
echosounder
St. Petersburg Coastal and Marine Science Center
SPCMSC
geophysical
Barrier Island Evolution Research Project
Barrier Island Mapping
15BIM10
15BIM11
15BIM12
15BIM13
2015-326-FA
DEM
Digital Elevation Model
50-meter DEM
Geographic Names Information System (GNIS)
Alabama
Gulf of Mexico
Mississippi Sound
Dauphin Island
None
datum
water
shoreline
None
August 2015
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.
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
ndewitt@usgs.gov
U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center
Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcCatalog 10.1.0.3035
The accuracy of the data is determined during data collection. The SBB data were collected during one research effort in August, 2015, USGS FAN 2015-326-FA. This research effort utilized four vessels and is therefore internally consistent per platform. Methods were employed to maintain data collection consistency aboard the platform. During mobilization, each piece of equipment is isolated to obtain internal and external offset measurements with respect to the survey platform. Each system has a dedicated computer, and efforts are made to utilize the same equipment and software versions on all systems. However, upgrades and changes occur and require additional setup, measurements, and notation. DGPS was always implemented for navigational accuracy in post-processing. These bathymetric data have not been independently verified for accuracy.
For the SBB, offsets between the single-beam transducers, the Ashtech antenna reference point (ARP), and the TSS motion unit were measured and accounted for on the roving vessels. All pertinent measurements were accounted for in the DGPS post processing software packages (National Geodetic Survey On-Line Positioning User Service, OPUS, and Waypoint Product Group GrafNav, version 8.6). Bar checks were also performed as calibration efforts and accounted for any drift in the echosounder.
This file represents the post-processed bathymetric data (x,y,z) collected during SBB surveys. They represent data coverage for the single-beam portion of the 2015 Dauphin Island survey, specifically FAN 2015-326-FA (SubFans 15BIM10, 15BIM11, 15BIM12, and 15BIM13). Refer to the online data release linkage for field logs, vessel platform descriptions, and other survey information; this information is directly available at https://doi.org/10.5066/F7BZ648W
These are complete post-processed xyz bathymetric data points from acoustic single-beam data collected in August 2015 from the nearshore areas of Dauphin Island, Alabama.
All static GPS base station sessions were run through the On-Line Positioning User Service (OPUS) maintained by the National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS). The base location results from OPUS were entered into a spreadsheet to compute one final coordinate and error analysis for that base location. Using the OPUS values for each day, and the total time that data were collected each day, the average daily weighted value of occupation time was calculated; longer occupation times held more value than shorter times. The final value for latitude, longitude, and ellipsoid was the weighted average of all the GPS session processed with OPUS. This value was entered in GrafNav version 8.6 as the base station coordinates. Error was calculated using output from OPUS for each day and was calculated as the absolute value of the final value minus the daily value. The maximum horizontal error of the base station coordinates used for post-processing the single-beam bathymetry was 0.00028 decimal seconds latitude and 0.00022 decimal seconds longitude for BH17 and 0.00027 decimal seconds latitude and 0.00018 decimal seconds longitude for WDAU.
0.00029
The range of error (0.00001 - 0.00029) for base stations BH17 and WDAU in latitude decimal seconds
0.00022
The range of error (0.00000 - 0.00022) for base stations BH17 and WDAU in longitude decimal seconds
All static base station sessions for BH17 and WDAU were processed through On-Line Positioning User Service (OPUS) maintained by the National Oceanic and Atmospheric Administration (NOAA) and the National Geodetic Survey (NGS). The base location results from OPUS were entered into a spreadsheet to compute a final, time-weighted positional coordinate (latitude, longitude, and ellipsoid height). Base-station positional error for each GPS session was calculated as the absolute value of the final position minus the session position value. SPCMSC standards define the maximum acceptable vertical error for any individual base station GPS session as less than or equal to three times the standard deviation of the ellipsoid height; any occupations exceeding this error are removed and the base station coordinates are recalculated. For BH17 base location the standard deviation of the ellipsoid height was 0.005 m and the maximum difference from the average ellipsoid for any GPS session was +/- 0.015 m. For WDAU base location the standard deviation of the ellipsoid height was 0.005 m and the maximum difference from the average ellipsoid for any GPS session was +/- 0.014 m.
VDatum Conversion: For the acquisition and processing steps please refer to the document Dauphin_Island_2015_SBB_ITRF00_xyz_metadata.txt, specifically the GPS acquisition, the single-beam bathymetry acquisition, the differentially corrected navigation processing, the single-beam bathymetry processing, and the single-beam bathymetry error analysis. This step involved transforming the file DI_2015_326_FA_SBB_Level_05_ITRF00.txt using VDATUM version 3.6 from ITRF00 to NAD83 for horizontal and NAVD88 with respect to GEOID12A model for the vertical component. This file was sent trough VDATUM version 3.6 a second time to convert the vertical from NAVD88 to Mean Low or Lower Water (MLLW).
DI_2015_326_FA_SBB_Level_05_ITRF00.txt
2016
Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt
Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
ndewitt@usgs.gov
Gridding Bathymetric NAD83 NAVD88 dataset: Using Esri ArcGIS version 10.3.1, the SBB data file Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt was converted into a shapefile from which the single-beam elevations were examined for spatial distribution and vertical agreement. A triangulated irregular network (TIN) was generated with this shapefile data and constrained using a polygon shoreline. The polygon shoreline was created in ArcGIS version 10.3.1 from using the zero line extracted from the 2015 USGS Dauphin Island Lidar dataset. The TIN was generated using the ArcToolbox 3D Analysts Data Management Tool “Create TIN”. This TIN file was then sent through the 3D Analyst Conversion Tool “TIN to Raster” using the natural neighbor method at 50 meter (m) by 50 m spacing to produce the raster Digital Elevation Model (DEM). Lastly, the raster was clipped to the survey extent using Spatial Analyst Extract tool “Extract by Mask” tool.
Gridding Bathymetric NAD83 MLLW dataset: Using Esri ArcGIS version 10.3.1, the SBB data file Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt was converted into a shapefile from which the single-beam elevations were examined for spatial distribution and vertical agreement. A triangulated irregular network (TIN) was generated with this shapefile data and constrained using a polygon shoreline. The polygon shoreline was created in ArcGIS version 10.3.1 from using the zero line extracted from the 2015 USGS Dauphin Island Lidar dataset. The TIN was generated using the ArcToolbox 3D Analysts Data Management Tool “Create TIN”. This TIN file was then sent through the 3D Analyst Conversion Tool “TIN to Raster” using the natural neighbor method at 50 meter (m) by 50 m spacing to produce the raster Digital Elevation Model (DEM). Lastly, the raster was clipped to the survey extent using Spatial Analyst Extract tool “Extract by Mask” tool.
Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt
Dauphin_2015_shoreline_NAD83_NAVD88_GEOID12A_polygon.shp
Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt
Dauphin_2015_shoreline_NAD83_MLLW_polygon.shp
2016
Dauphin_Island_2015_NAD83_NAVD88_GEOID12A_50_DEM.tif
Dauphin_Island_2015_NAD83_MLLW_50_DEM.tif
U.S. Geological Survey
Nancy DeWitt
Geologist
mailing and physical
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
ndewitt@usgs.gov
Trackline shapfefile:This trackline file was created from the all-encompassing x,y,z point file for USGS FAN 2015-326-FA (15BIM10, 15BIM11, 15BIM12 and 15BIM13) in Esri ArcGIS version 10.3 using the XTools Pro extension, version 11.1. The x,y,z data point shapefile was sent through the "XTools" feature conversion tool, "make polylines from points". Within "XTools" feature conversion selection window, the following items were selected. The "group by field selection" was set to use the HYPACK line name attribute and the "input feature order - order by field" was set to use the FID attribute. The trackline file does not have a vertical component and may be used for the NAD83 NAVD88 GEOID12A point dataset and the NAD83 MLLW point dataset.
Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.shp
2016
Dauphin_Island_2015_SBB_NAD83_tracklines.shp
U.S. Geological Survey
Nancy T. DeWitt
Geologist
Mailing and physical
600 4th Street South
St. Petersburg
FL
33701
U.S.
(727) 502-8000
ndewitt@usgs.gov
Added keywords section with USGS persistent identifier as theme keyword.
20201013
U.S. Geological Survey
VeeAnn A. Cross
Marine Geologist
Mailing and Physical
384 Woods Hole Road
Woods Hole
MA
02543-1598
508-548-8700 x2251
508-457-2310
vatnipp@usgs.gov
Raster
Grid Cell
174
686
1
Universal Transverse Mercator
16
0.9996
-87.0
0.0
500000.0
0.0
row and column
50
50
meter
North American Datum 1983
0.1
meter
Implicit coordinate
Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt
ASCII text file containing the processed single-beam bathymetry x,y,z point data in the NAD83, NAVD88 with respect to GEOID12A.
USGS
NAD83_X
NAD83 X-coordinate (easting) of sample point, in meters
VDatum version 3.6
365809.4126
400111.8019
NAD83_Y
NAD83 Y-coordinate (northing) of sample point, in meters
VDatum version 3.6
3340677.296
3349384.4683
NAVD88_G12A
NAVD88 orthometric height of sample point, in meters with respect to GEOID12A
VDatum version 3.6
-0.2438
-18.0175
NAD83_Lat
NAD83 Latitude of the sample point, in decimal degrees
VDatum version 3.6
30.193182
30.271231
NAD83_Long
NAD83 Longitude of the sample point, in decimal degrees
VDatum version 3.6
-88.394405
-88.038000
Year
The year the data was collected
CARIS
2015
DOY
Day of the year the data was collected
CARIS
232
236
GPS_Week
The GPS week that the data point was acquired.
CARIS
1858
1859
GPS_Second
The GPS second that the data point was acquired.
CARIS
48464.679
601766.29
HYPACKLine
Line number in survey generated by HYPACK.
HYPACK
Example 15BIM10_SALL_001_1400 in which 15BIM10 denotes the USGS FAN number, SALL denotes the vessel code of R/V Sallenger, 001 denotes the line number, and 1400 denotes the time the line started recording.
Variations in FAN number and vessel code are the following:
15BIM10_SALL_001_1400 = R/V Sallenger
15BIM11_TVEE_001_1400 = R/V Jabba Jaw
15BIM12_WVR1_001_1400 = R/V Shark
15BIM13_WVR2_001_1400 = R/V Chum
DataType
The type of data point.
USGS
SBB stands for single-beam bathymetry.
Dauphin_Island_2015_NAD83_tracklines.shp
Esri shapefile containing the survey tracklines for the single-beam bathymetry data collected during USGS FAN 2015-326-FA which includes subfans 15BIM10, 15BIM11, 15BIM12 and 15BIM13 surveyed in August 2015 nearshore Dauphin Island, Alabama.
USGS
FID
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Feature geometry.
Esri
Polyline ZM is the geometry type defining the features.
HYPACKLine
Trackline name assigned by HYPACK-A Xylem Brand acquisition software version 14 for 15BIM10 and version 13 for 15BIM11, 15BIM12, and 15BIM13 with the USGS FAN number appended to the beginning of the file. Example 15BIM10_SALL_001_1400 in which 15BIM10 denotes the USGS FAN number, SALL denotes the vessel code of R/V Sallenger, 001 denotes the line number, and 1400 denotes the time the line started recording.
Variations in FAN number and vessel code are the following:
15BIM10_SALL_001_1400 = R/V Sallenger
15BIM11_TVEE_001_1400 = R/V Jabba Jaw
15BIM12_WVR1_001_1400 = R/V Shark
15BIM13_WVR2_001_1400 = R/V Chum
HYPACK
15BIM10_001_1554
15BIM13_142_2159
DOY
Day of year the trackline was surveyed.
USGS
232
236
Year
The year the data was collected
CARIS
2015
USGS_FAN
The USGS FAN number assigned to the survey vessel and survey type. 15BIM10 = RV Sallenger, 15BIM11 = RV Jabba Jaw, 15BIM12 = RV Shark, and 15BIM13 = RV Chum.
USGS
USGS FAN Number as assigned.
Lenth_m
Length of survey line, in meters
Esri
1.28
27,948.06
meters
0.01
Boat
USGS vessel name from which survey data was acquired. The R/V Sallenger was used to acquire data for 15BIM10. The R/V Jabba Jaw was used to acquire data for 15BIM11. The R/V Shark was used to acquire data for 15BIM12, and the R/V Chum was used to acquire data for 15BIM13.
USGS
USGS research vessel name
Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt
ASCII text file containing the processed single-beam bathymetry x,y,z point data in the NAD83 and MLLW
USGS
NAD83_X
NAD83 X-coordinate (easting) of sample point, in meters
VDatum version 3.6
365809.4126
400111.8019
NAD83_Y
NAD83 Y-coordinate (northing) of sample point, in meters
VDatum version 3.6
3340677.296
3349384.4683
MLLW
Mean Lower Low Water (MLLW) of sample point, in meters
VDatum version 3.6
-0.1182
-17.9311
NAD83_Lat
NAD83 Latitude of the sample point, in decimal degrees
VDatum version 3.6
30.193182
30.271231
NAD83_Long
NAD83 Longitude of the sample point, in decimal degrees
VDatum version 3.6
-88.394405
-88.038000
Year
The year the data was collected
CARIS
2015
DOY
Day of the year the data was collected
CARIS
232
236
GPS_Week
The GPS week that the data point was acquired.
CARIS
1858
1859
GPS_Second
The GPS second that the data point was acquired.
CARIS
48464.679
601766.29
HYPACKLine
Line number in survey generated by HYPACK.
HYPACK
Example 15BIM10_SALL_001_1400 in which 15BIM10 denotes the USGS FAN number, SALL denotes the vessel code of R/V Sallenger, 001 denotes the line number, and 1400 denotes the time the line started recording.
Variations in FAN number and vessel code are the following:
15BIM10_SALL_001_1400 = R/V Sallenger
15BIM11_TVEE_001_1400 = R/V Jabba Jaw
15BIM12_WVR1_001_1400 = R/V Shark
15BIM13_WVR2_001_1400 = R/V Chum
DataType
The type of data point.
USGS
SBB stands for single-beam bathymetry.
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
ndewitt@usgs.gov
Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt
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.
ASCII, raster, and shapefile
ZIP
241.34
https://coastal.er.usgs.gov/data-release/doi-F7BZ648W/data/Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-F7BZ648W/data/Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_50_DEM.zip
https://coastal.er.usgs.gov/data-release/doi-F7BZ648W/data/Dauphin_Island_2015_SBB_NAD83_tracklines.zip
https://coastal.er.usgs.gov/data-release/doi-F7BZ648W/data/Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.zip
https://coastal.er.usgs.gov/data-release/doi-F7BZ648W/data/Dauphin_Island_2015_SBB_NAD83_MLLW_50_DEM.zip
none
The ASCII text files contained in the .zip archive can be accessed with any standard text file reader.
2017
20201013
Nancy T. DeWitt
U.S. Geological Survey St. Petersburg Coastal and Marine Science Center
Geologist
mailing and physical address
600 4th Street South
St. Petersburg
FL
33701
USA
(727) 502-8000
ndewitt@usgs.gov
Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998
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.
none
unclassified
None