NATIONAL WETLANDS INVENTORY

Abstract: National Wetands Inventory for Volusia County. This layer was downloaded from St Johns River Water Management District and not maintained by the County Environmental Staff. Please use caution when using this data. All questions about this data should be directed to SJRWMD.
Source: NWI digital data files are records of wetlands location and classification as defined by the U.S. Fish & Wildlife Service. This dataset is one of a series available in 7.5 minute by 7.5 minute blocks containing ground planimetric coordinates of wetlands point, line, and area features and wetlands attributes. When completed, the series will provide coverage for all of the contiguous United States, Hawaii, Alaska, and U.S. protectorates in the Pacific and Caribbean. The digital data as well as the hardcopy maps that were used as the source for the digital data are produced and distributed by the U.S. Fish & Wildlife Service's National Wetlands Inventory project. This dataset reflects a wetlands that are within and contiguous to St Johns River Water Management District boundaries.

Purpose: The data provide consultants, planners, and resource managers with information on wetland location and type. The data were collected to meet U.S. Fish & Wildlife Service's mandate to map the wetland and deepwater habitats of the United States. The purpose of this survey was not to map all wetlands and deepwater habitats of the United States, but rather to use aerial photointerpretation techniques to produce thematic maps that show, in most cases, the larger ones and types that can be identified by such techniques. The objective was to provide better geospatial information on wetlands than found on the U.S. Geological Survey topographic maps. It was not the intent of the NWI to produce aps that show exact wetland boundaries comparable to boundaries derived from ground surveys. Boundaries are therefore generalized in most cases. Consequently, the quality of the wetland data is variable mainly due to source photography, ease or difficulty of interpreting specific wetland types, and survey methods (e.g., level of field effort and state-of-the-art of wetland delineation) (see section on "Completenesss_Report" found in NWI metadata for more information).

Entity_Type_Definition: Wetlands are lands transitional between terrestrial and aquatic system where the water table is usually at or near the surface or the land is covered by shallow water. For purposes of this classification wetlands must have one or more of the following three attributes: 1) at least periodically, the land supports predominantly hydrophytes; 2) the substrate is predominantly undrained hydric soil; and 3) the substrate is non-soil and is saturated with water or covered by shallow water at some time during the growing season of each year.
Entity_and_Attribute_Overview: The wetland classification system is hierarchical, with wetlands and deepwater habitats divided among five major systems at the broadest level. The five systems include Marine (open ocean and associated coastline), Estuarine (salt marshes and brackish tidal water), Riverine (rivers, creeks, and streams),Lacustrine (lakes and deep ponds), and Palustrine (shallow ponds, marshes, swamps, sloughs). Systems are further subdivided into subsystems which reflect hydrologic conditions. Below the subsystem is the class which describes the appearance of the wetland in terms of vegetation or substrate. Each class is further subdivided into subclasses; vegetated subclasses are described in terms of life form and substrate ubclasses in terms of composition. The classification system also includes modifiers to describe hydrology (water regime), soils, water chemistry (pH, salinity), and special modifiers relating to man's activities (e.g., impounded, partly drained).
For complete Metadata visit:
http://www.fws.gov/wetlands

\\covsdesrv\GIS Common\datadictionary\WetlandsDeepWaterHabitatsClassification.pdf

Update Frequency: Unknown. Check with SJRWMD for updates.

Spatial Domain

West Coordinate:

-81.359054

East Coordinate:

-80.928748

North Coordinate:

29.246552

South Coordinate:

28.846581

Spatial Data Information

Data Type:

digital map

Data Format:

SDE Feature Class

Data Projection:

NAD_1983_HARN_StatePlane_Florida_East_FIPS_0901_Feet

NAME

DESCRIPTION