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• Identification_Information
• Data_Quality_Information
• Spatial_Data_Organization_Information
• Spatial_Reference_Information
• Entity_and_Attribute_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Nancy T. Dewitt

Originator: Kate T. Ciembronowicz

Originator: James G. Flocks

Originator: Lisa L. Robbins

Originator: Arnell S. Harrison

Publication_Date: 2007

Title:

Archive of side scan sonar and bathymetry data collected during USGS cruise 06FSH01 offshore of Siesta Key, Florida, May 2006.

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: U.S Geological Survey Data Series 291

Publication_Information:

Publisher: U.S. Geological Survey

Description:

Abstract:

This data set contains singlebeam bathymetric data acquired with a boat-based GPS/sonar hydrographic system collected during USGS cruise 06FSH01 aboard the R/V Streeterville. A side scan sonar, bathymetric, and high-resolution seismic-reflection survey was conducted off Sarasota, Florida to describe the relationship between the sediments and morphology of the inner shelf and adjacent shoreface. These data are part of the Florida Shelf Habitat (FLaSH) map project.

Purpose:

Part of a offshore site survey using high-resolution geophysical mapping (seismic, side scan and singlebeam bathymetery) techniques as part of the Florida Shelf Habitat (FLaSH) map project. More information is avilable at http://coastal.er.usgs.gov/flash.

Supplemental_Information:

In May of 2006, the U.S. Geological Survey conducted a geophysical survey offshore of Siesta Key, Florida, as part of the USGS Florida Shelf Habitat (FLaSH) study, a multiagency benthic habitat mapping project. For more information refer to http://coastal.er.usgs.gov/flash/. This report serves as an archive of the processed side scan sonar mosaic, processed singlebeam and swath bathymetry images, processed x,y,z swath bathymetry data, trackline maps, navigation files, GIS files, Field Activity Collection System (FACS) logs, observer's logbook, and formal FGDC metadata. Scanned images of the handwritten FACS logs and handwritten science logbook (12 MB) are also provided as PDF files. Gridded and interpolated surface digital images of the bathymetry are also provided. Refer to the Acronyms page for expansion of acronyms and abbreviations used in this report.

The USGS Florida Integrated Science Center (FISC) - St. Petersburg assigns a unique identifier to each cruise or field activity. For example, 06FSH01 tells us the data were collected in 2006 for the Florida Shelf Habitat (FLaSH) study and the data were collected during the first field activity for that project in that calendar year. Refer to http://walrus.wr.usgs.gov/infobank/programs/html/definition/activity.html for a detailed description of the method used to assign the field activity ID.

Aboard the R/V G.K. Gilbert, side scan sonar and interferometric swath bathymetry data were collected simultaneously along the tracklines. The side scan sonar towfish was towed behind the vessel close to the seafloor. The interferometric swath transducer was pole mounted to the ship's hull. See the digital FACS equipment log (13 KB) for details about the acquisition equipment used. Both raw data sets were stored digitally and processed using CARIS software in the St. Petersburg office. For more detailed information on processing refer to the Equipment and Processing page. Postprocessing of the swath data set revealed a motion artifact which is attributed to movement of the pole in relation to the boat. Due to scheduling constraints, the survey was forced to take place in less than ideal weather conditions, which caused a reduction in data quality. The rough seas contributed to both the movement of the pole and the very high noise base seen in the amplitude data.

In addition, singlebeam bathymetry was collected aboard the R/V Streeterville using SANDS, which is a singlebeam acoustic sounding GPS-based hydrographic data collection and processing system. Differential boat position was recorded using GPS referenced to a land-based benchmark which is occupied throughout the survey. Boat position, boat motion (heave, pitch, and roll), and depth readings are collected and stored in real time on the vessel and are later merged with the DGPS information using time correlations. For more detailed information on processing refer to the Equipment and Processing page. CHIRP data was also collected during the survey and is archived seperately in Data Series 254 and can be downloaded at https://pubs.usgs.gov/ds/2007/254.

Time_Period_of_Content:

Time_Period_Information:

Beginning_Date: May 10, 2006

Ending_Date: May 15, 2006

Calendar_Date: unknown

Currentness_Reference: Data collection interval

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -82.580708

East_Bounding_Coordinate: -82.507311

North_Bounding_Coordinate: 27.276281

South_Bounding_Coordinate: 27.195432

Keywords:

Theme:

Theme_Keyword: bathymetry

Theme_Keyword: seafloor mapping

Theme_Keyword: singlebeam

Theme_Keyword: USGS

Theme_Keyword: System for Accurate Nearshore Depth Surveying

Theme_Keyword: SANDS

Theme_Keyword: Hydrographic Survey

Theme_Keyword: Florida shelf habitat map

Place:

Place_Keyword: Sarasota, FL

Place_Keyword: Siesta Key

Place_Keyword: Eastern Gulf of Mexico

Place_Keyword: West-central Florida

Access_Constraints:

The U.S. Geological Survey must be referenced as the originator of this data set in any future products or research derived from these data.

Use_Constraints: These data are not to be used for navigation.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: USGS St. Petersburg Field Office

Contact_Person: Nancy Dewitt

Contact_Address:

Address_Type: mailing address

Address: 600 4th Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727.803.8747 x3058

Contact_Facsimile_Telephone: 727.803.2000

Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.1.0.722

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:

The accuracy of the attributes (latitude, longitude, and depth) is dependent on the accuracies of the equipment used to measure their values. See horizontal and vertical positional accuracy for further information.

Quantitative_Attribute_Accuracy_Assessment:

Attribute_Accuracy_Explanation:

A fixed 1-m bar is used for calibrating the USGS fathometer for shallow water surveys. The USGS bar is attached to the boat directly below the transducers. The USGS bar consists of a 1.5-inch aluminum pipe connected horizontally to a flat plate which is anchored to the boat. Because of the short bar length, this check only accounts for index errors of the echo system and does not account for speed of sound variations with depth. The speed of sound is continuously measured at the transducer by a sound velocity probe. Full phase carrier GPS data are acquired simultaneously by the reference and boat receivers. Reference station GPS data are first used to derive reference station coordinates (latitude, longitude, elevation), and later used for kinematic processing of the boat GPS data.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

The accuracy of the horizontal positions (latitude and longitude) is based on the accuracy of the Ashtech dual channel (Z-Xtreme), full-carrier-phase-resolving geodetic differential GPS receivers.

Quantitative_Horizontal_Positional_Accuracy_Assessment:

Horizontal_Positional_Accuracy_Value: +/- ~4 cm RMS

Horizontal_Positional_Accuracy_Explanation:

Surveys are only conducted during optimal weather conditions (surveying is not performed during storms or when winds are above 15 knots). Weather conditions, such as heavy storms, lightning storms, and heavy cloud cover, and water clarity affect the collection process. Surveying was halted when GPS cycle slips occurred or when PDOP values were greater than 3.0. These weather problems result in poor or inaccurate readings from the GPS unit. Any questionable data points are removed or reprocessed through the GPS processing software. The accuracy of horizontal position is based upon a measure of the GPS quality parameters: combined horizontal and vertical differences, RMS, PDOP, and quality flag. A bias of less than 1cm is introduced by inaccuracies of the reference station absolute horizontal position.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report:

The accuracy of the vertical position is based on the accuracy of the Ashtech dual channel (Z-Xtreme), full-carrier-phase-resolving geodetic differential GPS receivers.

Quantitative_Vertical_Positional_Accuracy_Assessment:

Vertical_Positional_Accuracy_Value: +/- ~10 cm RMS

Vertical_Positional_Accuracy_Explanation:

Surveys are only conducted during optimal weather conditions (surveying is not performed during storms or when winds are above 15 knots). Weather conditions, such as heavy storms, lightning storms, and heavy cloud cover, and water clarity affect the collection process. Surveying was halted when GPS cycle slips occur or when PDOP values were greater than 3.0. These weather problems result in poor or inaccurate readings from the GPS unit. Any questionable data points are removed or reprocessed through the GPS processing software. The accuracy of singlebeam data is based on the crossing readings conducted during the surveying and a measure of the GPS quality parameters: combined horizontal and vertical differences, RMS, PDOP, and quality flag. In general, 85 percent of the soundings are better than +/-6 cm RMS. A bias of less than 3 cm is introduced by inaccuracies of the reference station absolute vertical position.

Lineage:

Process_Step:

Process_Description:

The survey was conducted using a precision hydrographic system developed and tested by the USGS called SANDS (System for Accurate Nearshore Depth Surveying). The SANDS system consist of a shallow draft boat equipped with two Ashtech Z-Xtreme GPS receivers which acquire full phase carrier signals from the NAVSTAR GPS constellation. The USGS SANDS utilizes Ashtech Z-12 generation type dual-frequency, 12-channel full-carrier-phase GPS receivers. Dorne-Margolin-type choke ring antennas are used at the reference station and on the boat. GPS acquisition interval is 1 s (1 Hz). To minimize the adverse effects of vessel motion, the SANDS system is equipped with a TSS-DMS-05 heave, pitch, and roll compensator. Motion acquisition interval is 0.05 s (20 Hz). The scientific grade echosounder or fathometer used in the SANDS system is a Marimatech E-Sea-103. Sounding acquisition interval is 0.1 s (10 Hz). Motion of the boat was continuously measured at 0.05 s (20 Hz) using a TSS-DMS-05 sensor. An Applied Microsystems Smart SV is used to collect speed of sound (SOS) information at the transducers. SOS acquisition interval is 1 s (1 Hz). The boat is navigated and all sensor data acquired using Coastal Oceanographics, Inc. HYPACK surveying software. GPS data are processed using Waypoint Consulting, Inc. GrafNav GPS processing software. GPS data are processed relative to the WGS84 ellipsoid. The USGS SANDS software merges all senor data based upon time, performs geometric corrections, and outputs final x,y,z data relative to NAVD88 via GEOID99.

Process_Date: 2007

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

Address: 600 4th Street South

City: Saint Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727.803.8747 x3058

Contact_Facsimile_Telephone: 727.803.2000

Contact_Electronic_Mail_Address: ndewitt@usgs.gov

Process_Step:

Process_Description:

The x,y,z ASCII data were imported into ESRI ArcGIS v. 9.1 using the ASCII to GRID command. A nearest neighbor interpolation was used in order to generate a continuous bathymetric surface from the interferometric sonar data. This surface was exported to raster using a 5- and 10-m cell size. This file is named "grd_5m."

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Kate Ciembronowicz

Contact_Organization:

U.S. Geological Survey, Florida Integrated Science Center, St. Petersburg, FL

Contact_Position: Geologist

Contact_Address:

Address_Type: mailing and physical address

Address: 600 4th Street South

City: Saint Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727.803.8747 x3124

Contact_Facsimile_Telephone: 727.803.2000

Contact_Electronic_Mail_Address: kciembro@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String

Point_and_Vector_Object_Count: 48

Raster_Object_Information:

Raster_Object_Type: Grid Cell

Row_Count: 1774

Column_Count: 1432

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: 17

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600

Longitude_of_Central_Meridian: -81.000000

Latitude_of_Projection_Origin: 0.000000

False_Easting: 500000.000000

False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: row and column

Coordinate_Representation:

Abscissa_Resolution: 5.000000

Ordinate_Resolution: 5.000000

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: WGS_1984

Semi-major_Axis: 6378137.000000

Denominator_of_Flattening_Ratio: 298.257224

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988

Altitude_Resolution: 1

Altitude_Distance_Units: meters

Altitude_Encoding_Method: Implicit coordinate

Depth_System_Definition:

Depth_Datum_Name: North American Vertical Datum of 1988

Depth_Resolution: 0.01

Depth_Distance_Units: meters

Depth_Encoding_Method: Implicit coordinate

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: WO3

Entity_Type_Definition:

The coordinates and elevation for bathymetric soundings nearshore Sarasota, FL

Attribute:

Attribute_Label: ObjectID

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: Value

Attribute:

Attribute_Label: Red

Attribute:

Attribute_Label: Green

Attribute:

Attribute_Label: Blue

Overview_Description:

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey

Contact_Address:

Address_Type: mailing and physical address

Address: 600 4th Street South

City: St. Petersburg

State_or_Province: Florida

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727.803.8747

Resource_Description: Downloadable data

Distribution_Liability:

This DVD publication was prepared by an agency of the United States Government. Although these data have been 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, or for general or scientific purposes, 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 therein. Reference therein 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.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: ESRI_Grid

Format_Version_Number: ArcGIS 9.1

Format_Specification: ESRI Grid file

Format_Information_Content:

Grid containing swath bathymetric data collected offshore Sarasota, FL

File_Decompression_Technique: no compression applied

Transfer_Size: 10.444

Metadata_Reference_Information:

Metadata_Date: 20070501

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Kate Ciembronowicz

Contact_Organization: U.S. Geological Survey FISC

Contact_Position: Geologist

Contact_Address:

Address_Type: 600 4th Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727.803.8747 x3124

Contact_Facsimile_Telephone: 727.803.2000

Contact_Electronic_Mail_Address: kciembro@usgs.gov

Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

Metadata_Time_Convention: local time

Metadata_Access_Constraints:

The U.S. Geological Survey must be referenced as the originator of this data set in any future products or research derived from these data.

Metadata_Use_Constraints: none

Metadata_Extensions:

Online_Linkage: http://www.esri.com/metadata/esriprof80.html

Profile_Name: ESRI Metadata Profile