Gulf Islands National Seashore (Alabama) 2001 Submerged Aquatic Vegetation

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey, National Wetlands Research Center
Publication_Date: 2003
Title:: Gulf Islands National Seashore (Alabama) 2001 Submerged Aquatic Vegetation
Geospatial_Data_Presentation_Form: Digital vector data

Description:

Abstract:: This data set consists of digital data describing the submerged aquatic vegetation (seagrass) beds for the Gulf Islands National Seashore in Alabama in 2001. The data set includes 7 3.75' quarter quadrangles, which were digitized at the Mid-Continent Ecological Science Center from mylar hard copy maps developed by the U.S. Geological Survey, National Wetlands Research Center. For three of the quadrangles, an associated linear file exist. The seagrass beds were classified according to a seagrass classification developed by USGS, NOAA, and FMRI based on bed density.
Purpose:: The intended use of this data set is to provide a comprehensive assessment of the distribution and extent of seagrass habitat communities along the Northeast Gulf of Mexico.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2001

Currentness_Reference: Photography Date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None Planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -88.375
East_Bounding_Coordinate: -88.000
North_Bounding_Coordinate: 30.375
South_Bounding_Coordinate: 30.250

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Submerged Aquatic Vegetation
Theme_Keyword: Seagrass
Theme_Keyword: SAV
Theme_Keyword: bed density
Theme_Keyword: classification
Theme_Keyword: mapping
Theme_Keyword: photointerpretation
Theme_Keyword: GIS

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Fort Morgan
Place_Keyword: Heron Bay
Place_Keyword: Little Dauphin Island
Place_Keyword: Gulf Islands National Seashore
Place_Keyword: Petit Bois Pass
Place_Keyword: Dauphin Island
Place_Keyword: Mobile Bay
Place_Keyword: USA
Place_Keyword: Alabama
Place_Keyword: AL

Temporal:

Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2001

Access_Constraints:

It is strongly recommended that this data is directly acquired from the distributor described above or from another USGS Biological Resources Division server and not indirectly through other sources which may have changed the data in some way. The distributor makes no claims as to the data's suitability for other purposes.

Use_Constraints:

Acknowledgement of the U.S. Geological Survey, National Wetlands Research Center as a data source would be appreciated in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed directly from these data would also be appreciated by NWRC staff. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The distributor shall not be liable for improper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. These data are not legal documents and are not to be used as such.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey, National Wetlands Research Center
Contact_Person: Larry Handley

Contact_Position: Geographer and Principle Investigator

Contact_Address:

Address_Type: Mailing and Physical Address
Address: 700 Cajundome Blvd
City: Lafayette
State_or_Province: LA
Postal_Code: 70506
Country: USA

Contact_Voice_Telephone: 337 266-8691

Contact_Facsimile_Telephone: 337 266-8513

Contact_Electronic_Mail_Address: larry_handley@usgs.gov

Data_Set_Credit:

The U.S. Geological Survey, National Wetlands Research Center acknowledges 3Di for the use of the aerial photography to create the seagrass data.

Native_Data_Set_Environment: ARC/INFO Version 8+ double precision

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:: Interpreted photos were quality checked by two photo interpreters for attribute classification. Field verification was performed for areas where attribute classification was questionable. The mylar-based maps were checked by cartographic personnel for line and labelworks. The attribute accuracy is tested by manually comparing hard copy plots of the digital data with the source materials. When attributes cannot be visually verified on plots, they are interactively queried and verified on screen. In addition, the attributes are compared against a master set of valid attributes.

Logical_Consistency_Report:

ARC/INFO software is used to create and maintain topological relationships between features. There are no duplicate features, but coincident lines are maintained between data layers where appropriate. Polygonal features begin and end at the same point, contain no overshoots or undershoots, and contain a single label. Linear features are continuous where appropriate, i.e., dangling arcs are removed if they are not required.

Completeness_Report:

For cartographic process, accordance with nationally accepted mapping standards and conventions were followed.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report:: The horizontal positional accuracy is tested by visual comparison of hard copy check plots to the source materials and verifying the location of the data on-screen relative to other data layers in the same geographic area.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: Not applicable

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: 3Di, LLC

Publication_Date: 200110

Title: Natural Color Aerial Photography

Edition: Varies

Geospatial_Data_Presentation_Form: Remote-Sensing Image

Publication_Information:

Publication_Place: Easton, Maryland
Publisher: 3Di, LLC

Source_Scale_Denominator: 12000

Type_of_Source_Media: Stable-Base Material

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 20011030

Source_Currentness_Reference: Photography Date

Source_Citation_Abbreviation: 3Di NC

Source_Contribution:

Primary data for photo interpretation and identification of submerged vegetation.

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey, Mapping Applications Center

Publication_Date: 200306

Title: Digital Orthophoto Quadrangles

Geospatial_Data_Presentation_Form: digital raster data

Publication_Information:

Publication_Place: Reston, VA
Publisher: U.S. Geological Survey (USGS)

Source_Scale_Denominator: 24000

Type_of_Source_Media: database file

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 200202

Source_Currentness_Reference: Publication Date

Source_Citation_Abbreviation: DOQQ

Source_Contribution:

Provided base maps for submerged aquatic vegetation information.

Process_Step:

Process_Description:: Cartographic process: Planning for the flight mission was prepared according to shoreline distance. The photos were interpreted using a Bausch Lomb stereoscope at 10X magnification. Cartographic work was performed using a Zoom Transfer Scope, and magnification varied according to source material scale.
Process_Date: 2002

Process_Step:

Process_Description:: Digitizing Process: Mylar overlays were manually digitized using an Altek Datatab digitizer to capture the data at a resolution of at least 0.001 inches. Four control points corresponding to the four corners of the quadrangle were used for registration during data collection. Cover type features continuing onto adjacent quadrangles were adjusted to intersect the quad boundary at a common, coincident node. Attributes were assigned as the data were digitized, or in an editing session after the digitizing was completed.
Process_Date: 2003

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Dauphin Island, Alabama
Direct_Spatial_Reference_Method: Vector

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:

Longitude_of_Central_Meridian: -87
Latitude_of_Projection_Origin: 0
False_Easting: 500000
False_Northing: 0
Scale_Factor_at_Central_Meridian: .9996

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: Coordinate Pair

Coordinate_Representation:

Abscissa_Resolution: .61
Ordinate_Resolution: .61

Planar_Distance_Units: Meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS80
Semi-major_Axis: 6378206
Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Submerged aquatic vegetation (SAV)
Entity_Type_Definition: Aquatic vegetation, rooted, found up to 6 meters of water
Entity_Type_Definition_Source:: Seagrass Density Classification System (USGS, NOAA, FMRI): Handley, L., et.al. Gulf of Mexico Seagrass Status and Trends Report. United States, U.S. Geological Survey

Attribute:

Attribute_Label: Sub_aq_veg

Attribute_Definition: Submerged aquatic vegetation as a percentage of ground cover

Attribute_Definition_Source: Seagrass Density Classification System