Florida Bay Bottom Types map

Metadata:

• 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:

Robert Halley

Ellen Prager

Publication_Date: 1997

Title: Florida Bay Bottom Types map

Geospatial_Data_Presentation_Form: map

Series_Information:

Series_Name: USGS Open-File Reports

Issue_Identification: OFR 97-526

Publication_Information:

Publication_Place: Reston VA

Publisher: U.S. Geological Survey

Online_Linkage:

<http://sofia.usgs.gov/publications/fs/156-96/bottom_types/index.html>

Description:

Abstract:

The map shows the bottom types for Florida Bay that resulted from site surveys, boat transects, and comparison with aerial photographs (December 1994-January 1995) and SPOT satellite imagery (1987).

Purpose:

The purpose of this map is to describe the bottom types found within Florida Bay for use in 1) assessing bottom friction associated with sediment and benthic communities and 2) providing a very general description for other research needs. For these purposes, two descriptors were considered particularly important: density of seagrass cover and sediment texture. Seagrass estimates are visual estimates of the amount of seagrass cover including both number of plants and leaf length. Therefore, seagrass cover may be greater in areas with long leaves than in areas with short blades, even though the number of shoots may be the same. Seagrass cover is a different measure than density (Zieman et al., 1989 or Durako et al., 1996). It is used here to more accurately reflect hydrodynamic influence than the standing crop of seagrass. Our use and definitions of dense, intermediate and sparse seagrass cover are similar to those used by Scoffin (1970). This map and associated descriptions are not meant to assess ecologic communities or detail sedimentological facies. The resolution of the map has been selected in an effort to define broad regions for use in modeling efforts. For these purposes, small-scale changes in bottom type (e.g. small seagrass patches) are not delineated.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 1996

Ending_Date: 199701

Currentness_Reference: bottom conditions

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -81.25

East_Bounding_Coordinate: -80.25

North_Bounding_Coordinate: 25.25

South_Bounding_Coordinate: 24.67

Keywords:

Theme:

Theme_Keyword_Thesaurus: none

Theme_Keyword: circulation

Theme_Keyword: sediments

Theme_Keyword: water quality

Theme_Keyword: chemistry

Theme_Keyword: hydrology

Theme_Keyword: bottom types

Place:

Place_Keyword_Thesaurus: none

Place_Keyword: Florida Bay

Place_Keyword: Florida

Place_Keyword: Monroe County

Place_Keyword: Central Everglades

Access_Constraints: none

Use_Constraints: none

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Robert Halley

Contact_Organization: U.S. Geological Survey

Contact_Position: Project Chief

Contact_Address:

Address_Type: mailing and physical address

Address: 600 Fourth Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727 803-8747 ext 3020

Contact_Facsimile_Telephone: 727 803-2030

Contact_Electronic_Mail_Address: rhalley@usgs.gov

Browse_Graphic:

Browse_Graphic_File_Name:

<http://sofia.usgs.gov/publications/fs/156-96/bottom_types/index.html>

Browse_Graphic_File_Description: Florida Bay Salinity Data Location Map

Browse_Graphic_File_Type: GIF

Data_Set_Credit: Data was collected by Robert Halley and Ellen Prager.

Native_Data_Set_Environment: The map is available as an Adobe PDF file.

Cross_Reference:

Citation_Information:

Originator:

Prager, E. J.

Halley, R. B.

Publication_Date: 1999

Title:

The influence of seagrass on shell layers and Florida Bay mudbanks

Series_Information:

Series_Name: Journal of Coastal Research

Issue_Identification: v. 15, 1151-1162

Publication_Information:

Publication_Place: Fort Lauderdale, FL

Publisher: Coastal Education and Research Foundation (CERF)

Data_Quality_Information:

Logical_Consistency_Report: not applicable

Completeness_Report:

Over 650 sites in the Bay were located and examined using a small, flat-bottomed boat, high resolution GPS and snorkeling gear.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:

Local information was recorded in the Bay using a DIO-issued military style GPSunit - Rockwell Precision Lightweight GPS Receiver PLGR+96 with a precision of +/- 10m.

Lineage:

Process_Step:

Process_Description:

During the summer of 1996 and January 1997 site surveys were conducted in Florida Bay. A small, flat-bottomed boat, high resolution GPS, and snorkeling gear were used to locate and examine over 650 sites within the Bay. In areas where depth and water clarity permitted, observations from the boat along transects between survey sites were used to identify the extent of bottom types. Over 100 sediment samples were collected and analyzed for grain size, mud, water, carbonate and organic content. Two descriptors were considered particularly important - the density of the seagrass and sediment texture.

The site surveys and boat transects were compared with aerial photographs from December 1994 - January 1995 and SPOT satellite imagery from 1987 to produce the map of bottom types for Florida Bay.

Process_Date: 1997

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Robert Halley

Contact_Organization: U.S. Geological Survey

Contact_Position: Project Chief

Contact_Address:

Address_Type: mailing and physical address

Address: 600 Fourth Street South

City: St. Petersburg

State_or_Province: FL

Postal_Code: 33701

Country: USA

Contact_Voice_Telephone: 727 803-8747 ext 3020

Contact_Facsimile_Telephone: 727 803-2030

Contact_Electronic_Mail_Address: rhalley@usgs.gov

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Florida Bay

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0001

Longitude_Resolution: 0.0001

Geographic_Coordinate_Units: Decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Overview_Description:

Entity_and_Attribute_Overview:

Eight bottom types are delineated on the map:

Bank Top Suite - commonly called mud banks and occurring at depths typically less the 0.6 m. These areas are spatially complex environments that are dominated by mud, sand, or, in the western portion of the Bay, gravel.

Open Mud - areas where no significant seagrass growth occurs and other benthic fauna except for algal mats are not apparent. Sediments are predominately carbonate mud with a relatively high organic and water content.

Hardbottom - areas with little or no seagrass cover and only up to 5 cm of sediment overlying the Pleistocene limestone bedrock. Sediments tend to be either lightly muddy carbonate sand or sand, have relatively little organic matter, and low water content.

Sparse Seagrass Cover - area in which greater than 50 percent of the bottom is exposed. Sediments are predominately slightly muddy carbonate sand, sandy mud, or sand and vary form 3 cm to over 2 m in thickness.

Intermediate Seagrass Cover - greater than 50 percent seagrass cover with open areas of exposed sediment on the bottom less that 50 percent. Sediments are dominated by sand and shelly (gravely) carbonate mud from 0.33 m to over 2m thick.

Dense Seagrass Cover - areas where the bottom is completely obscured from view by grass growth. Sediments are muddy sand with a relatively high organic and/or shell content.

Open Sandy Areas - areas that are distinct from hardbottoms in that no significant benthic life is present. Sediments are coarse shelly carbonate sands.

Mixed Bottom Suites - areas of a highly variable bottom type where variations in seagrass density are extreme and open mud areas occur on a seemingly irregular basis. Sediments are coarse shelly carbonate sands.

Entity_and_Attribute_Detail_Citation:

A more complete description of the bottom types may be found at <http://sofia.usgs.gov/publications/fs/156-96/bottom_types/index.html>.

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Roy Sonenshein

Contact_Organization: U.S. Geological Survey

Contact_Position: Database Manager

Contact_Address:

Address_Type: mailing address

Address:

9100 NW 36th Street Suite 107

City: Miami

State_or_Province: FL

Postal_Code: 33178

Country: USA

Contact_Voice_Telephone: 305 717-5824

Contact_Facsimile_Telephone: 305 717-5801

Contact_Electronic_Mail_Address: sunshine@usgs.gov

Resource_Description: Florida Bay Bottom Types map

Distribution_Liability: No warrantees are implied or explicit for the data

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Adobe Acrobat Reader

Format_Version_Number: 4.0

Format_Information_Content: The file contains the map of Florida Bay Bottom Types

Transfer_Size: 2.5

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name:

<http://sofia.usgs.gov/publications/fs/156-96/bottom_types/index.html>

Access_Instructions: Log on to the SOFIA web site at <http://sofia.usgs.gov>

Fees: none

Metadata_Reference_Information:

Metadata_Date: 20020207

Metadata_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Jo Anne Stapleton

Contact_Organization: U. S. Geological Survey

Contact_Address:

Address_Type: mailing address

Address: 521 National Center

City: Reston

State_or_Province: VA

Postal_Code: 20192

Contact_Voice_Telephone: 703 648 4592

Contact_Facsimile_Telephone: 703 648 4614

Contact_Electronic_Mail_Address: jastapleton@usgs.gov

Metadata_Standard_Name: FGDC Content Standard for Digital Geospatial Metadata

Metadata_Standard_Version: FGDC-STD-001-1998

U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
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Generated by mp version 2.7.19 on Fri Feb 22 13:17:01 2002