Davis Pond Marsh-Vegetative Type 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:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division, and the U.S. Geological Survey, Biological Resources Division's National Wetlands Research Center
Publication_Date: 200104
Title: Davis Pond Marsh-Vegetative Type Map
Geospatial_Data_Presentation_Form: Vector Digital data

Description:

Abstract:: This data set consists of vector line information. The original data set was collected through visual field observation by Greg Linscombe of LDWF and Robert H. Chabreck of LSU Agricultural Center. The observations were made while flying over the Davis Pond study area in a Bell 206 Jet Ranger helicopter. Flight was along north/south transects over the area (bounded by Bayou Lafourche on the west, Mississippi River on the east, Highway 90 to the north, and the Gulf of Mexico to the south). Vegetative data were obtained at pre-determined stations. The stations were located using a Trimble Ag 122 Global Positioning system (GPS) and a computer running Dynamo Geographic Information System (GIS) by GeoFocus. This information was recorded manually into field tally sheets and later converted in a GIS application. The marsh type delineation lines were produced by freehanding contours through on-screen interpretation. The flight line data were used as a guide for drawing the lines. The new data set resulted in a line coverage delineating vegetative marsh type.
Purpose: To describe the vegetative marsh type for the Davis Pond area.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2000

Currentness_Reference: Ground condition

Status:

Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -90.979
East_Bounding_Coordinate: -89.729
North_Bounding_Coordinate: 29.85
South_Bounding_Coordinate: 29.142

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Coastal
Theme_Keyword: Marsh
Theme_Keyword: Vegetation
Theme_Keyword: Delineation
Theme_Keyword: Ecological Characterization

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Louisiana
Place_Keyword: Coastal Louisiana
Place_Keyword: Louisiana Coastal Zone
Place_Keyword: Davis Pond

Temporal:

Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2000

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 U.S. Geological Survey, National Wetlands Research Center 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:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division
Contact_Person: Greg Linscombe

Contact_Position: Biologist

Contact_Address:

Address_Type: Mailing and Physical
Address: 2415 Darnall Road
City: New Iberia
State_or_Province: LA
Postal_Code: 70506
Country: USA

Contact_Voice_Telephone: 337-373-0032

Contact_Facsimile_Telephone: 337-373-0181

Contact_Electronic_Mail_Address: linscombe_rg@wlf.state.la.us

Data_Set_Credit:

The National Wetlands Research Center acknowledges the Louisiana Department of Wildlife and Fisheries for the use of the data derived from the vegetative marsh study conducted by Robert H. Chabreck and Greg Linscombe.

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.0.0.535

Cross_Reference:

Citation_Information:

Originator:

Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division, and the U.S. Geological Survey, Biological Resources Division's National Wetlands Research Center

Publication_Date: 200104

Title: Davis Pond Marsh-Vegetative Transect Point Database

Edition: 2000

Publication_Information:

Publication_Place: Lafayette, LA
Publisher:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division, and the U.S. Geological Survey, Biological Resources Division's National Wetlands Research Center

Cross_Reference:

Citation_Information:

Originator:

Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division, and the U.S. Geological Survey, Biological Resources Division's National Wetlands Research Center

Publication_Date: 200104

Title: Davis Pond Marsh-Vegetative Type Transect Lines

Edition: 2000

Publication_Information:

Publication_Place: Lafayette, LA
Publisher:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division, and the U.S. Geological Survey, Biological Resources Division's National Wetlands Research Center

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:: Digital data was generated using a tabular database from which values were assigned by the data collector in the field. The accuracy is not based on a formal quantitative assessment and was based on the judgement of the data collector in the field. To attain a better estimate of accuracy, a formal re-evaluation of the Davis Pond area would be necessary to see if there are areas where discrepancies exist.

Logical_Consistency_Report:

Data is inherently polygonal. Polygons intersecting the neatline are closed along the border. Segments making up the outer and inner boundaries of a polygon tie end-to-end to completely enclose the area. Line segments are a set of sequentially numbered coordinate pairs. No duplicate features exist nor duplicate points in the data string. Intersecting lines are separated into individuals line segments at the points of intersection.

Completeness_Report:

All data were derived in the same general format, through freehand contouring in ArcView by on-screen interpretation utilizing transect point data as a guide for contouring. During the freehand contouring of the lines between marsh types, if a levee existed, the line would follow the levee. If no levee existed, the line would split the space between the two marsh types. If a body of water existed between the marsh types, the boundary of the water body would be used to split the two categories.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: Louisiana Department of Wildlife and Fisheries

Publication_Date: 2000

Title: Davis Pond Marsh Vegetative Type Database

Edition: 2000

Geospatial_Data_Presentation_Form: Tabular digital data

Publication_Information:

Publication_Place: New Iberia, LA
Publisher:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division

Type_of_Source_Media: Digital database file

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2000

Source_Currentness_Reference: Date of source data

Source_Citation_Abbreviation: LDWF

Source_Contribution: Primary data for the vegetative marsh type map

Process_Step:

Process_Description:: The original data were collected through visual field observation by Greg Linscombe of LDWF and Robert H. Chabreck of LSU Agricultural Center. The observations were made while flying over the study area in a Bell 206 Jet Ranger helicopter. DynaMo GIS software (GEOFocus, Inc) and a differental GPS (Trimble Ag 122) were used to navigate the helicopter along the transect lines. Attribute information was then entered in a Microsoft Access database containing all the attribute information. The marsh type delineation lines were produced by freehanding contours through on-screen interpretation. The flight data were used as a guide for delineating the marsh type lines. The shapefile containing the contour information was created in ArcView and later converted to a coverage in Arc/INFO. The coverage was subsequently cleaned, assigned polygon toplogy, and assigned attributes. Attributes assigned include: fresh marsh, intermediate marsh, brackish marsh, salt marsh, non-marsh/other, and water. The vegetative type was an indicator of soil and water salinity of an area and was comprised of an association of plant species having similar salt tolerances.
Process_Date: 2001

Spatial_Data_Organization_Information:

Indirect_Spatial_Reference: Davis Pond
Direct_Spatial_Reference_Method: Vector

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: Unknown
Longitude_Resolution: Unknown
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:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Vegetative Marsh Types
Entity_Type_Definition:: An indicator of soil and water salinity of an area and comprised of plant species having similar salt tolerances.
Entity_Type_Definition_Source:: Louisiana Department of Wildlife and Fisheries, Fur and Refuge Division

Attribute:

Attribute_Label: CODE

Attribute_Definition: Vegetative Marsh Type

Attribute_Definition_Source: LDWF