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Short Citation:
OCM Partners, 2023: Autonomous Surface Vehicle Side-Scan-Sonar Mosaic of Apalachicola Bay, Florida,

Item Identification

Title: Autonomous Surface Vehicle Side-Scan-Sonar Mosaic of Apalachicola Bay, Florida
Short Name: fl_ab06_sss-mosaicASV-meta
Status: Completed
Publication Date: 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 the 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



These data are high-resolution acoustic backscatter measurements over part of Porter's Bar in St. George Sound, Florida. These data were collected using the Autonomous Surface Vessel (ASV) IRIS primarily over known oyster bars in waters less than 1-2 meters deep.




Theme Keywords

Thesaurus Keyword
ISO 19115 Topic Category
ISO 19115 Topic Category
ISO 19115 Topic Category
General ASV
General Autonomous Surface Vehicle
General CMGP
General Coastal and Marine Geology Program
General EdgeTech
General EdgeTech 4200 FS
General field activity serial number 06001
General GeoTIFF image
General IRIS
General Marine Geology
General Seafloor
General Sidescan
General Sidescan-Sonar
General U.S. Geological Survey
General USGS
General WHSC
General Woods Hole Science Center
None Environmental Monitoring

Temporal Keywords

Thesaurus Keyword
General 2006

Spatial Keywords

Thesaurus Keyword
None Apalachicola Bay
None Apalachicola National Estuarine Research Reserve
None Florida
None Gulf of Mexico
None St. George Sound
None United States

Physical Location

Organization: Office for Coastal Management
City: Charleston
State/Province: SC

Data Set Information

Data Set Scope Code: Data Set
Maintenance Frequency: None Planned
Data Presentation Form: Image (digital)
Entity Attribute Overview:

Side-scan sonar images are grey scale rasters. There are no attributes associated with a GeoTIFF image. Image pixel values contain acoustic reflectivity values normalized to an 8-bit data range (0-255). Low-backscatter is represented by dark tones (low values) and high-backscatter is represented by bright tones (high values).

Entity Attribute Detail Citation:


Distribution Liability:

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/GISand its user community.NOAA in no way represents the interests of ESRI,nor acts as agents for them. The user must have software capable of viewing a GeoTIFF data file.

Support Roles

Data Steward

CC ID: 668749
Date Effective From: 2007
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


CC ID: 668751
Date Effective From: 2007
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Metadata Contact

CC ID: 668752
Date Effective From: 2007
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202

Point of Contact

CC ID: 668750
Date Effective From: 2007
Date Effective To:
Contact (Organization): NOAA Office for Coastal Management (NOAA/OCM)
Address: 2234 South Hobson Ave
Charleston, SC 29405-2413
Email Address:
Phone: (843) 740-1202


Currentness Reference: Ground Condition

Extent Group 1

Extent Group 1 / Geographic Area 1

CC ID: 668755
W° Bound: -85.066448
E° Bound: -84.804303
N° Bound: 29.748173
S° Bound: 29.616901

Extent Group 1 / Time Frame 1

CC ID: 668754
Time Frame Type: Discrete
Start: 2006-06-03

Spatial Information

Spatial Representation

Representations Used

Grid: Yes

Grid Representation 1

CC ID: 668740
Dimension Count: 3
Cell Geometry: Point
Transformation Parameters Available?: No

Axis Dimension 1

Dimension Type: Row
Size: 1637

Axis Dimension 2

Dimension Type: Column
Size: 1988

Axis Dimension 3

Dimension Type: Vertical
Size: 1

Access Information

Security Class: Unclassified
Data Access Constraints:


Data Use Constraints:

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.

Distribution Information

Distribution 1

CC ID: 740243
Download URL:
File Name: Bulk Download

Simple download of data files.



CC ID: 740245
URL Type:
Online Resource


CC ID: 740246
URL Type:
Online Resource

Activity Log

Activity Log 1

CC ID: 668786
Activity Date/Time: 2016-05-23

Date that the source FGDC record was last modified.

Activity Log 2

CC ID: 668785
Activity Date/Time: 2017-11-14

Converted from FGDC Content Standards for Digital Geospatial Metadata (version FGDC-STD-001-1998) using '' script. Contact Tyler Christensen (NOS) for details.

Activity Log 3

CC ID: 718279
Activity Date/Time: 2018-02-08

Partial upload of Positional Accuracy fields only.

Activity Log 4

CC ID: 740244
Activity Date/Time: 2018-03-13

Partial upload to move data access links to Distribution Info.

Technical Environment


Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog

Data Quality


Not relevant to this data set.

Horizontal Positional Accuracy:

The ASV used RTK-GPS for navigation. RTK-GPS is assumed to be accurate within 1-2 meters. All GPS/DGPS data are referenced to WGS84. The sidescan-sonar transducers are mounted on a metal frame between the two pontoons about 0.5m below water surface, and directly below the GPS antenna..

Completeness Report:

Although both the 100 kHz and 400 kHz frequency data were collected, only the high-frequency 400 kHz data were processed and included in this mosaic. Small differences in contrast stretch (DN values) exist because of variations in sea and weather conditions on each survey day.

Conceptual Consistency:

Not applicable for raster data.


Process Steps

Process Step 1

CC ID: 668738

The sidescan-sonar data were acquired with a EdgeTech 4200 FS dual-frequency sidescan-sonar system. The EdgeTech 4200 operates in a frequency range of 100 and 400 kHz. Data were collected and logged to onboard in .jsf format using EdgeTech JStar acquisition software. All jsf files for each Julian day were imported to Xsonar and converted to Xsonar format using the 400 kHz channel. Each file was corrected for slant range and beam pattern corrections as described in Danforth (1997). The individual line files were mosaiced in Xsonar with a range cutoff of 25m. The composite mosaic was exported as a GeoTIFF image, with an associated world file.

Process Date/Time: 2006-09-01 00:00:00

Catalog Details

Catalog Item ID: 49583
GUID: gov.noaa.nmfs.inport:49583
Metadata Record Created By: Anne Ball
Metadata Record Created: 2017-11-15 15:15+0000
Metadata Record Last Modified By: SysAdmin InPortAdmin
Metadata Record Last Modified: 2023-05-30 18:09+0000
Metadata Record Published: 2018-03-13
Owner Org: OCMP
Metadata Publication Status: Published Externally
Do Not Publish?: N
Metadata Last Review Date: 2018-03-13
Metadata Review Frequency: 1 Year
Metadata Next Review Date: 2019-03-13