47876 fl_ab06_bath-meta Data Set Published / External 37225 Benthic Project Completed 2007 These data were collected under a cooperative mapping program between the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration Office for Coastal Management (NOAA\OCM), and the Apalachicola National Estuarine Research Reserve (NERR). The primary objectives of this program were to collect marine geophysical data to develop a suite of seafloor maps to better define the extent of oyster habitats, the overall seafloor geology of the bay and provide updated information for management of this resource. In addition to their value for management of the bay's oyster resources, the maps also provide a geologic framework for scientific research and the public. High-resolution bathymetry, backscatter intensity, and seismic profile data were collected over 230 square kilometers of the floor of the bay. The study focused on Apalachicola Bay and Western St. George Sound portions of the estuary mostly in depths > 2.0 meters. Original contact information: Contact Name: Brian Andrews Contact Org: U.S. Geological Survey Title: Geographer Phone: 508-548-8700 x2348 Email: bandrews@usgs.gov The purpose of this dataset is to produce a bathymetric grid of the area within the survey boundary in St. George Sound and Apalachicola Bay. The purpose of these data is to represent the swath bathymetry in a courser grid cell resolution but cover the gaps between survey lines. In shallow areas less than 2m deep the digitized seafloor from the ASV seismic data was used to provide single beam bathymetry. 10033 These data are a bathymetric grid of Apalachicola Bay and St. George Sound generated from swath sounding gridded at 5m. Refer to processing steps under data quality section for detailed methods. Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > BENTHIC Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > COASTAL Theme Global Change Master Directory (GCMD) Science Keywords EARTH SCIENCE > BIOSPHERE > ECOSYSTEMS > MARINE ECOSYSTEMS > ESTUARY Theme ISO 19115 Topic Category elevation Theme ISO 19115 Topic Category oceans Spatial Global Change Master Directory (GCMD) Location Keywords CONTINENT > NORTH AMERICA > UNITED STATES OF AMERICA > FLORIDA Spatial Global Change Master Directory (GCMD) Location Keywords OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN > GULF OF AMERICA Theme General ArcGIS Raster Theme General CMGP Theme General Coastal and Marine Geology Program Theme General Interferometric Sonar Theme General Marine Geology Theme General Seafloor Theme General Swath Bathymetry Theme General U.S. Geological Survey Theme General USGS Theme General WHSC Theme General Woods Hole Science Center Theme General field activity serial number 05001 Theme General field activity serial number 06001 Theme General seafloor mapping Temporal General 2005 Temporal General 2006 Spatial General Apalachicola Bay Spatial General Apalachicola National Estuarine Research Reserve Spatial General Florida Spatial General Gulf of Mexico Spatial General St. George Sound Spatial General United States Office for Coastal Management Charleston SC Data Set None Planned Map (digital) NOAA manages much of the data to users of digital geographic data. NOAA is in no way condoning or endorsing the application of this data for any given purpose.It is the sole responsibility of the user to determine whether or not the data is suitable for the intended purpose. It is also the obligation of the user to apply the data in an appropriate and conscientious manner.NOAA provides no warranty,nor accepts any liability occurring from any incomplete,incorrect, or misleading data, or from any incorrect,incomplete, or misleading use of the data. Much of the data is based on and maintained with ARC/GIS software developed by the Environmental Systems Research Institute (ESRI).In addition, much of the information presented uses conventions and terms popularized by ARC/GIS and its user community. NOAA in no way represents the interests of ESRI,nor acts as agents for them. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 49278 fl_ab06_bath Published / External Completed Bathymetric depths | Description Source: USGS Converted from FGDC using 'fgdc_to_inport_xml_entity.pl' script. 1 ObjectID Unknown No No Active Internal feature number. | Description Source: ESRI Sequential unique whole numbers that are automatically generated. 2 Value Unknown No No Active Depth in meters | Description Source: ESRI Depth values within the project area 3 Count Unknown No No Active Number of pixels with a given depth value. | Description Source: ESRI Counts of pixels within the data set. Data Steward 2007 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Distributor 2007 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Metadata Contact 2007 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Point of Contact 2007 Organization NOAA Office for Coastal Management NOAA/OCM coastal.info@noaa.gov 2234 South Hobson Ave Charleston SC 29405-2413 (843) 740-1202 https://coast.noaa.gov NOAA Office for Coastal Management Home Page Online Resource Ground Condition -85.096558 -84.753126 29.789051 29.597035 Discrete 2005-03-14 Discrete 2005-04-13 Discrete 2006-05-29 Discrete 2006-06-27 Yes 3 Area No Row 828 Column 1315 Vertical 1 Unclassified Data can be downloaded via the World Wide Web (WWW); None Data are not intended for navigational use. These data should not be used at resolutions for which it is not intended. Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information. http://pubs.usgs.gov/of/2006/1381/GIS/raster/bath/apbaybath25m.zip Downloadable Data https://ocmgeodatastor1.blob.core.windows.net/benthic-data/Benthic/Shallow_Water_Bathymetry/FL_ApalachicolaBay_bath.zip http://pubs.usgs.gov/of/2006/1381/GIS/thumbnails/apbaybath25m.jpg Browse Graphic Browse Graphic JPEG color coded image http://pubs.usgs.gov/of/2006/1381/ Online Resource https://coast.noaa.gov/ NOAA's Office for Coastal Management (OCM) website Online Resource Information on the NOAA Office for Coastal Management (OCM) 2017-03-30 Date that the source FGDC record was last modified. 2017-11-14 Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using 'fgdc_to_inport_xml.pl' script. Contact Tyler Christensen (NOS) for details. 2018-02-08 Partial upload of Positional Accuracy fields only. 2018-04-11 Partial upload to move data access FTP links to Distribution Info and remove broken URLs. Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350 DGPS is assumed to be accurate within 1-2 meters. Standard GPS is assumed accurate within 5-10 meters. 99% of the positional data is DGPS. Unless noted, all GPS/DGPS data is referenced to WGS84 (NAD83). The configuration of the fathometer is as follows: the transducer on the RAFAEL was mounted on a pole at the vessel's bow. Offset between the bow mount and GPS antenna is measured. On ASV IRIS, the subbottom profiler used to measure water depth was mounted directly below the GPS antenna. No measurements were taken of ship's pitch, yaw, heave, or change in draft due to water and fuel usage. Motion of the fathometer is not measured. Horizontal accuracy of the fathometer is assumed to be within +/- 3 meters. Ship motion was recorded with a TSS DMS 2-05 Attitude Sensor, mounted on a head above the interferometric Submetrix 2000 Series transducers. Navigation was recorded using Real Time Kinematic Differential Global Positioning System (RTK-DGPS). The interferometric sonar is an angle-measuring system; depth accuracy decreases with increasing horizontal range. The combined angular accuracy of the Submetrix 2000 Series and the TSS DMS 2-05 attitude sensor is documented as 0.1 degrees. Assuming a constant angular accuracy, and using the International Hydrographic Standard (IHO) of a required 0.3 meter accuracy in < 30 meter water depth, all data collected within the survey fall within the IHO accuracy standards. However, vertical accuracy is also directly affected by the accuracy of both the navigation system and tidal measurements. RTK DGPS vertical accuracy is assumed to be 0.2 meters. Tidal elevations were derived from RTK -DGPS heights sent from a survey-specific base station located on St. George Island. The base station occupied a temporary monument. The x & y positions were calculated for that location using a 3 day average of 12 hour data sets using the Online Positioning User Service (OPUS, National Geodetic Survey) solution. Tidal elevations were calculated from NOAA Tidal Station #8728690 using the same OPUS solution and then applied to the corrected elevations for the base station at St. George Island. Antenna heights were referenced to Mean Lower Low Water (MLLW) for easier comparison of NOAA nautical charts. Soundings were gridded in OMG SwathEd software using the entire swath width across track to achieve maximum coverage at the scale of the entire Apalachicola Bay/St. George Sound survey area. Although the soundings were manually edited, small data spikes may exist at outer edges of some swaths. Pockmark features that appear in the dredge channel of the intracoastal waterway fairways are artifacts of the processing methods used to generate a continuous surface from swath bathymetry collected on lines spaced 100m apart. These data have not been quantitatively compared to previous hydrographic data, although they generally agree with qualitative comparison of published NOAA charts. 1 Bathymetric data were corrected for variations in the speed of sound throughout the water column; sound velocity profiles were acquired throughout the survey area using an Applied MicroSystems SVPlus Sound Velocimeter. These data were downloaded and reformatted to the required format needed for use within University of New Brunswick's Ocean Mapping Group (OMG) SwathEd multibeam processing software. The raw Submetrix 2000 Series data were "unraveled" and reformatted into the OMG format. This process creates several files on disk: 1) bathymetric soundings 2) raw sidescan backscatter 3) navigation 4) parameter files describing the configuration of the system (i.e. offsets between motion reference unit and GPS antenna, etc). This process also incorporates the sound velocity profiles in order to properly trace the rays given the structure of the water column. 2006-10-01T00:00:00 10 Converted Tin to Raster using Natural Neighbors using floating point and natural neighbors options. Cells size was set at 25m. 2007-01-01T00:00:00 11 Output Raster was clipped to a polygon boundary delineating the extent of bathymetric data. 2007-01-01T00:00:00 12 The clipped 25m bathymetric grid was smoothed with a 3x3 low-pass filter. 2007-01-01T00:00:00 13 Individual 25m smoothed grids of Apalachicola Bay and St. George Sound were merged together to make one grid for both areas. 2007-01-01T00:00:00 2 The OMG formatted bathymetric data were then graphically edited using the SwathEd multibeam processing software. This step enabled editing on a "ping-by-ping" basis, both in the across- and along-track dimension. Spurious or erroneous data were removed. The navigation data were also graphically examined for each line of data. 2006-10-01T00:00:00 3 Soundings were corrected to mean lower low water (MLLW) using high-resolution Real-Time Kinematic Global Positioning System (RTKGPS) measurements. The one second RTK data were smoothed in MatLab using a 3rd order polynomial and then merged with each line file in SwathEd. 2006-10-01T00:00:00 4 Soundings data were gridded using the weigh_grid routines from SwathEd. Soundings were corrected to mean lower low water during the weigh_grid operation using the real time kinematic differential global positioning navigation files. The final weigh_grid parameters used were: weigh_grid -omg -coeffs -butter -lambda 5 -cutoff 20 Max_incidence angle was not used on most lines to allow usage of bathymetry data points from a broader section of the swath. Only lines from rough days, when the vessel heave was large, were gridded with a small incidence angle to maximize the good data from adjacent lanes and reduce the noisy data. 2006-10-01T00:00:00 5 Final soundings were gridded to a 5m grid cell resolution using SwathEd weigh_grid command and the following gridding parameters: weigh_grid -omg -coeffs -butter -power 2 -lambda 1 -cutoff 4 -max_incidence 60 A 5m grid cell size reduced the number of points and a max_incidence of 60 degrees was used to remove the outer soundings which tended to be noisy. 2006-10-01T00:00:00 6 The final grid in SwathEd OMG format was imported directly into IVS DMagic software producing a .geo, .dtm, and .shade file. The dtm file was exported to an x,y,z comma delimited file. 2006-10-01T00:00:00 7 The comma-delimited x,y,z file of bathymetry was added to ArcMap as an event theme and converted to a point feature class. Two separate x,y,z files and feature classes were processed; one for Apalachicola Bay, and one for St. George Sound. 2006-10-01T00:00:00 8 The remaining geoprocessing steps were completed using one model developed in ArcGIS Modelbuilder. The Model is included in the geodatabase distributed with the Open-File Report. Each of the processing steps used to Create the Model for St. George Sound are described below. The same processing steps were used to create a second Model for Apalachicola Bay using the same steps. Created empty TIN and added the x,y,z points using the geoprocessing history below: Create TIN *Date: 20061027 *Time: 113410 *Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\3D Analyst Tools.tbx\CreateTin *Command issued: CreateTin D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\StGTin "PROJCS['WGS_1984_UTM_Zone_16N',GEOGCS['GCS_WGS_1984',DATUM['D_WGS_1984',SPHEROID['WGS_1984',6378137.0,298.257223563]],PRIMEM['Greenwich',0.0],UNIT['Degree',0.0174532925199433]],PROJECTION['Transverse_Mercator'],PARAMETER['False_Easting',500000.0],PARAMETER['False_Northing',0.0],PARAMETER['Central_Meridian',-87.0],PARAMETER['Scale_Factor',0.9996],PARAMETER['Latitude_Of_Origin',0.0],UNIT['Meter',1.0]];-10000 -10000 100000;0 100000;0 100000" 2006-10-01T00:00:00 9 Added 5m xyz points to TIN See geoprocessing history below: Process: *Process name: Edit TIN *Date: 20061027 *Time: 113535 *Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\3D Analyst Tools.tbx\EditTin *Command issued: EditTin D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\stgtin "StG_5mc_xyz depth masspoints false;BathClip <None> <None> hardclip false" D:\GIS\FL\rafa06001\ArcGIS\Bathy\BathInterp\Tin\stgtin 2006-10-01T00:00:00 49278 Entity gov.noaa.nmfs.inport:47876 Anne Ball 2017-11-14T12:57:21 Jesse Brass 2026-06-19T19:17:23 2018-04-11 Office for Coastal Management OCM 1002 Public No No 2018-04-11 1 Year 2019-04-11