Metadata: Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey Publication_Date: 20170508 Title: 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. Geospatial_Data_Presentation_Form: Mulitmedia Online_Linkage: https://doi.org/10.5066/F7BZ648W Larger_Work_Citation: Citation_Information: Originator: Nancy T. DeWitt Originator: Chelsea A. Stalk Originator: James G. Flocks Originator: Julie C. Bernier Originator: Kyle W. Kelso Originator: Jake J. Fredericks Originator: Thomas Tuten Publication_Date: 2017 Title: Single-Beam Bathymetry Data Collected in 2015 nearshore Dauphin Island, Alabama. Geospatial_Data_Presentation_Form: multimedia presentation Series_Information: Series_Name: U.S. Geological Survey Data Release Issue_Identification: doi:10.5066/F7BZ648W Publication_Information: Publication_Place: St. Petersburg, Florida Publisher: U.S. Geological Survey Online_Linkage: https://doi.org/10.5066/F7BZ648W Description: Abstract: 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 Field Activity Collection Systems (FACS) logs, a comprehensive 50-meter Digital Elevation Model (DEM), and formal Federal Geographic Data Committee (FGDC) metadata. Purpose: 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. Supplemental_Information: 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. Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 20150819 Ending_Date: 20150825 Currentness_Reference: ground condition Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -88.395035 East_Bounding_Coordinate: -88.037688 North_Bounding_Coordinate: 30.271956 South_Bounding_Coordinate: 30.190155 Keywords: Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:5cfc2d26-faa3-4bfe-bf03-8dedb2806928 Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: oceans Theme_Keyword: elevation Theme_Keyword: location Theme_Keyword: geoscientificInformation Theme_Keyword: imageryBaseMapsEarthCover Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: marine geology Theme_Keyword: geophysics Theme_Keyword: bathymetry Theme_Keyword: single-beam echo sounder Theme_Keyword: field monitoring stations Theme_Keyword: digital elevation models Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: trackline Theme_Keyword: bathymetry Theme_Keyword: USGS Theme_Keyword: shapefile Theme_Keyword: HYPACK Theme_Keyword: single-beam bathymetry Theme_Keyword: base station Theme_Keyword: benchmark Theme_Keyword: West Dauphin Island (WDAU) Benchmark Theme_Keyword: NGS (National Geodetic Survey) Permanent Identifier (PID) BH1755 Theme_Keyword: kinematic Theme_Keyword: shoreline Theme_Keyword: hydrography Theme_Keyword: ODOM Echotrach CV-100 Theme_Keyword: ODOM Theme_Keyword: TSS Motion Sensor Theme_Keyword: echosounder Theme_Keyword: St. Petersburg Coastal and Marine Science Center Theme_Keyword: SPCMSC Theme_Keyword: geophysical Theme_Keyword: Barrier Island Evolution Research Project Theme_Keyword: Barrier Island Mapping Theme_Keyword: 15BIM10 Theme_Keyword: 15BIM11 Theme_Keyword: 15BIM12 Theme_Keyword: 15BIM13 Theme_Keyword: 2015-326-FA Theme_Keyword: DEM Theme_Keyword: Digital Elevation Model Theme_Keyword: 50-meter DEM Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Alabama Place_Keyword: Gulf of Mexico Place_Keyword: Mississippi Sound Place_Keyword: Dauphin Island Stratum: Stratum_Keyword_Thesaurus: None Stratum_Keyword: datum Stratum_Keyword: water Stratum_Keyword: shoreline Temporal: Temporal_Keyword_Thesaurus: None Temporal_Keyword: August 2015 Access_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. Use_Constraints: These data should not be used for navigational purposes. Point_of_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Nancy T. DeWitt Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Position: 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) 502-8000 Contact_Electronic_Mail_Address: ndewitt@usgs.gov Data_Set_Credit: U.S. Geological Survey, Coastal and Marine Geology Program, St. Petersburg Coastal and Marine Science Center Native_Data_Set_Environment: Microsoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcCatalog 10.1.0.3035 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: 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. Logical_Consistency_Report: 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 vessel platform descriptions and other survey information; this information is directly available at https://doi.org/10.5066/F7BZ648W Completeness_Report: 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: 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. Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 0.00029 Horizontal_Positional_Accuracy_Explanation: The range of error (0.00001 - 0.00029) for base stations BH17 and WDAU in latitude decimal seconds Quantitative_Horizontal_Positional_Accuracy_Assessment: Horizontal_Positional_Accuracy_Value: 0.00022 Horizontal_Positional_Accuracy_Explanation: The range of error (0.00000 - 0.00022) for base stations BH17 and WDAU in longitude decimal seconds Vertical_Positional_Accuracy: Vertical_Positional_Accuracy_Report: 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. Lineage: Process_Step: Process_Description: 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). Source_Used_Citation_Abbreviation: DI_2015_326_FA_SBB_Level_05_ITRF00.txt Process_Date: 2016 Source_Produced_Citation_Abbreviation: Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt Process_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Nancy T. DeWitt Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Position: 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) 502-8000 Contact_Electronic_Mail_Address: ndewitt@usgs.gov Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: 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 Process_Date: 2016 Source_Produced_Citation_Abbreviation: Dauphin_Island_2015_NAD83_NAVD88_GEOID12A_50_DEM.tif Dauphin_Island_2015_NAD83_MLLW_50_DEM.tif Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Nancy DeWitt Contact_Position: Geologist Contact_Address: Address_Type: mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: USA Contact_Voice_Telephone: (727) 502-8000 Contact_Electronic_Mail_Address: ndewitt@usgs.gov Process_Step: Process_Description: 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. Source_Used_Citation_Abbreviation: Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.shp Process_Date: 2016 Source_Produced_Citation_Abbreviation: Dauphin_Island_2015_SBB_NAD83_tracklines.shp Process_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey Contact_Person: Nancy T. DeWitt Contact_Position: Geologist Contact_Address: Address_Type: Mailing and physical Address: 600 4th Street South City: St. Petersburg State_or_Province: FL Postal_Code: 33701 Country: U.S. Contact_Voice_Telephone: (727) 502-8000 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_Data_Organization_Information: Direct_Spatial_Reference_Method: Raster Raster_Object_Information: Raster_Object_Type: Grid Cell Row_Count: 174 Column_Count: 686 Vertical_Count: 1 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Planar: Grid_Coordinate_System: Grid_Coordinate_System_Name: Universal Transverse Mercator Universal_Transverse_Mercator: UTM_Zone_Number: 16 Transverse_Mercator: Scale_Factor_at_Central_Meridian: 0.9996 Longitude_of_Central_Meridian: -87.0 Latitude_of_Projection_Origin: 0.0 False_Easting: 500000.0 False_Northing: 0.0 Planar_Coordinate_Information: Planar_Coordinate_Encoding_Method: row and column Coordinate_Representation: Abscissa_Resolution: 50 Ordinate_Resolution: 50 Planar_Distance_Units: meter Vertical_Coordinate_System_Definition: Depth_System_Definition: Depth_Datum_Name: North American Datum 1983 Depth_Resolution: 0.1 Depth_Distance_Units: meter Depth_Encoding_Method: Implicit coordinate Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Dauphin_Island_2015_SBB_NAD83_NAVD88_GEOID12A_xyz.txt Entity_Type_Definition: ASCII text file containing the processed single-beam bathymetry x,y,z point data in the NAD83, NAVD88 with respect to GEOID12A. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: NAD83_X Attribute_Definition: NAD83 X-coordinate (easting) of sample point, in meters Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 365809.4126 Range_Domain_Maximum: 400111.8019 Attribute: Attribute_Label: NAD83_Y Attribute_Definition: NAD83 Y-coordinate (northing) of sample point, in meters Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3340677.296 Range_Domain_Maximum: 3349384.4683 Attribute: Attribute_Label: NAVD88_G12A Attribute_Definition: NAVD88 orthometric height of sample point, in meters with respect to GEOID12A Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.2438 Range_Domain_Maximum: -18.0175 Attribute: Attribute_Label: NAD83_Lat Attribute_Definition: NAD83 Latitude of the sample point, in decimal degrees Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 30.193182 Range_Domain_Maximum: 30.271231 Attribute: Attribute_Label: NAD83_Long Attribute_Definition: NAD83 Longitude of the sample point, in decimal degrees Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -88.394405 Range_Domain_Maximum: -88.038000 Attribute: Attribute_Label: Year Attribute_Definition: The year the data was collected Attribute_Definition_Source: CARIS Attribute_Domain_Values: Unrepresentable_Domain: 2015 Attribute: Attribute_Label: DOY Attribute_Definition: Day of the year the data was collected Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 232 Range_Domain_Maximum: 236 Attribute: Attribute_Label: GPS_Week Attribute_Definition: The GPS week that the data point was acquired. Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1858 Range_Domain_Maximum: 1859 Attribute: Attribute_Label: GPS_Second Attribute_Definition: The GPS second that the data point was acquired. Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48464.679 Range_Domain_Maximum: 601766.29 Attribute: Attribute_Label: HYPACKLine Attribute_Definition: Line number in survey generated by HYPACK. Attribute_Definition_Source: HYPACK Attribute_Domain_Values: Unrepresentable_Domain: 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 Attribute: Attribute_Label: DataType Attribute_Definition: The type of data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: SBB stands for single-beam bathymetry. Detailed_Description: Entity_Type: Entity_Type_Label: Dauphin_Island_2015_NAD83_tracklines.shp Entity_Type_Definition: 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. Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: FID Attribute_Definition: Internal feature number. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated. Attribute: Attribute_Label: Shape Attribute_Definition: Feature geometry. Attribute_Definition_Source: Esri Attribute_Domain_Values: Unrepresentable_Domain: Polyline ZM is the geometry type defining the features. Attribute: Attribute_Label: HYPACKLine Attribute_Definition: 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 Attribute_Definition_Source: HYPACK Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 15BIM10_001_1554 Range_Domain_Maximum: 15BIM13_142_2159 Attribute: Attribute_Label: DOY Attribute_Definition: Day of year the trackline was surveyed. Attribute_Definition_Source: USGS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 232 Range_Domain_Maximum: 236 Attribute: Attribute_Label: Year Attribute_Definition: The year the data was collected Attribute_Definition_Source: CARIS Attribute_Domain_Values: Unrepresentable_Domain: 2015 Attribute: Attribute_Label: USGS_FAN Attribute_Definition: 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. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: USGS FAN Number as assigned. Attribute: Attribute_Label: Lenth_m Attribute_Definition: Length of survey line, in meters Attribute_Definition_Source: Esri Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.28 Range_Domain_Maximum: 27,948.06 Attribute_Units_of_Measure: meters Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Boat Attribute_Definition: 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. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: USGS research vessel name Detailed_Description: Entity_Type: Entity_Type_Label: Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt Entity_Type_Definition: ASCII text file containing the processed single-beam bathymetry x,y,z point data in the NAD83 and MLLW Entity_Type_Definition_Source: USGS Attribute: Attribute_Label: NAD83_X Attribute_Definition: NAD83 X-coordinate (easting) of sample point, in meters Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 365809.4126 Range_Domain_Maximum: 400111.8019 Attribute: Attribute_Label: NAD83_Y Attribute_Definition: NAD83 Y-coordinate (northing) of sample point, in meters Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3340677.296 Range_Domain_Maximum: 3349384.4683 Attribute: Attribute_Label: MLLW Attribute_Definition: Mean Lower Low Water (MLLW) of sample point, in meters Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.1182 Range_Domain_Maximum: -17.9311 Attribute: Attribute_Label: NAD83_Lat Attribute_Definition: NAD83 Latitude of the sample point, in decimal degrees Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 30.193182 Range_Domain_Maximum: 30.271231 Attribute: Attribute_Label: NAD83_Long Attribute_Definition: NAD83 Longitude of the sample point, in decimal degrees Attribute_Definition_Source: VDatum version 3.6 Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -88.394405 Range_Domain_Maximum: -88.038000 Attribute: Attribute_Label: Year Attribute_Definition: The year the data was collected Attribute_Definition_Source: CARIS Attribute_Domain_Values: Unrepresentable_Domain: 2015 Attribute: Attribute_Label: DOY Attribute_Definition: Day of the year the data was collected Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 232 Range_Domain_Maximum: 236 Attribute: Attribute_Label: GPS_Week Attribute_Definition: The GPS week that the data point was acquired. Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1858 Range_Domain_Maximum: 1859 Attribute: Attribute_Label: GPS_Second Attribute_Definition: The GPS second that the data point was acquired. Attribute_Definition_Source: CARIS Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 48464.679 Range_Domain_Maximum: 601766.29 Attribute: Attribute_Label: HYPACKLine Attribute_Definition: Line number in survey generated by HYPACK. Attribute_Definition_Source: HYPACK Attribute_Domain_Values: Unrepresentable_Domain: 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 Attribute: Attribute_Label: DataType Attribute_Definition: The type of data point. Attribute_Definition_Source: USGS Attribute_Domain_Values: Unrepresentable_Domain: SBB stands for single-beam bathymetry. Distribution_Information: Distributor: Contact_Information: Contact_Person_Primary: Contact_Person: Nancy T. DeWitt Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Position: 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) 502-8000 Contact_Electronic_Mail_Address: ndewitt@usgs.gov Resource_Description: Dauphin_Island_2015_SBB_NAD83_MLLW_xyz.txt Distribution_Liability: 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. 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Available_Time_Period: Time_Period_Information: Single_Date/Time: Calendar_Date: 2017 Metadata_Reference_Information: Metadata_Date: 20220613 Metadata_Contact: Contact_Information: Contact_Person_Primary: Contact_Person: Nancy T. DeWitt Contact_Organization: U.S. Geological Survey St. Petersburg Coastal and Marine Science Center Contact_Position: 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) 502-8000 Contact_Electronic_Mail_Address: ndewitt@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_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. 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