The area mapped by the contractor is equivalent to approximately 60 USGS 7.5' quads. It included the following five sub-project areas: 1. Ocala National Forest, Central Orange County, and North-central Polk County 2. Baker County and western Nassau, Duval, and Clay counties 3. Central St. Johns, Flagler, and Volusia counties 4. Eastern Osceola County 5. Cape Canaveral
These wetlands maps only indicate areas of wetlands vegetation, primarily those in a natural state. They do not delineate hydric soils, by any definition. Developed wetlands areas are usually not included. Wetlands are mapped at a scale greater than 1:24,000, and may not be used accurately for presentation or analysis at larger scales. Local determinations always require field inspection.
It is recommended that the SJRWMD Wetlands maps be used in conjunction with other sources, particularly the National Wetlands Inventory, Soil Survey Reports, and Land Use / Land Cover maps. Due to the nature of land cover mapping, there are significant differences among these sources.
Drained wetlands are mapped as uplands if wetlands vegetation is not present, or if land is farmed or developed. Managed forests in hydric areas may be mapped as Forested Depression - Pine or as uplands.
No edit masks present; Coverages exist in double precision; Fuzzy tolerances will be 0.0001; Arc and polygon topology present; All coverages shall be coordinated edgematched to adjacent coverages; Identically coded polygons shall not be adjacent to each other within a coverage; No superfluous pseudo nodes or tics; No duplicate features; No sliver polygons, label errors, dangles, or intersection errors shall exist;
The maps are accurate only for the date of photography used. Many vegetation types undergo rapid change, such as floating vegetation or cleared areas. Many are changed by land use factors. Wetlands maps represent a baseline inventory, and are not edited to reflect changes.
Thematic accuracy: Correct differentiation of wetlands from uplands: 95% Correct differentiation of saline wetlands from freshwater or transitional wetlands: 95% Correct differentiation of forested, shrub, herbaceous, or other growth forms: 90% Correct differentiation of specific types within classes: 80%
Positional Accuracy: The horizontal error of clearly identifiable features shall not exceed an average of 10 meters or a maximum of 15 meters for any 7.5' quadrangle area, with error measured as horizontal discrepancy between wetlands map coordinates and the locations of features obtained from 1995 Digital Orthoquads.
Polygon boundaries and positional control points were delineated on mylar sheets using a zoom stereoscope. The linework and points were digitized and then georeferenced using a SJRWMD fortran program called Space 4, which performs perspective transformation using both ground control and tie points.
Ancillary data used to interpret wetland polygons includes National Wetlands Inventory (NWI) maps, Soil Surveys, USGS 7.5 topo maps, and other sources of Photography archived at the District. Extensive field checking was done on many of the quads.
An index map at /sjr/es2/wetlands/metadata/wetveg_index/windex.cmp shows the completion status of the quads. The coverage windex, same location, includes attributes for the completion status of each quad or sub-quad areas.
Added symbology (*,>,< /, -) indicate degree of inclusion, over/under story, and sub levels. A number of modifiers, infrequently used, mainly indicate management status.
Cypress (CY) - Forested wetlands dominated by bald cypress or pond cypress (Taxodium distichum or T. ascendens) and flooded annually for periods of long duration - typically 4 to 8 months in any given year. Includes cypress dome, stand, and lakeshore variants.
Hardwood Swamp (HS) - Forested wetlands dominated by one or more decidu-ous hardwood species typically including black gum, red maple, water ash, water elm, and willows. Cypress is often a significant compo-nent of this type. Subject to annual, seasonal periods of prolonged flooding.
Bayhead (BH) - Forested wetlands dominated by one or more species of broadleaved, evergreen bay trees (Gordonia lasianthus, Persea palus-tris, or Magnolia virginica). Dahoon holly (Ilex cassine) may occa-sionally be dominant. Soils usually organic and nearly constantly saturated as well as being at least occasionally flooded. The canopy of some sites may be dominated by pines, but bays and other indica-tors will be prevalent in the subcanopy and understory.
Baygall (BG) - Forested wetlands typically dominated by one or more species of evergreen bay trees or less commonly by dahoon holly, deciduous hardwoods, or pine. Located at the bases of sandy slopes and maintained by downslope seepage. Soils organic and nearly con-stantly saturated but infrequently flooded.
Hydric Hammock (HH) - Forested systems dominated by a mixture of broadle-aved evergreen and deciduous tree species. Cabbage palmetto (CP) may be dominant in some variants of this type. Seldom inundated but with saturated soils during much of the year.
Bottomland Hardwoods (BL) - Deciduous forest communities lying in the floodplains of rivers and streams subject to rapid rise and fall of floodwaters. At other times, they may be relatively well drained, or at most, saturated by lateral seepage. Associated soils are allu-vial.
Forested Flatwoods Depressions (FD) - Typically pond cypress, pine,decid-uous hardwood, bay, or cabbage palm dominated communities occupying shallow depressions in mesic flatwoods sites. Understory vegetation consists of hydrophytic shrubs, grasses, and herbs. Saw palmetto, gallberry and other typical mesic flatwoods species generally absent. In the absence of fires, or as a result of forest management practices, understory or associated species (such as loblolly bay) may dominate these sites. Soils usually sandy and subject to brief (1 - 2 months) seasonal inundation or prolonged soil saturation.
Shrub Swamp (SS) - Dominated by willows, buttonbush, or similar appearing vegetation. Hydrology similar to that of cypress, hardwood swamp, or shallow marsh communities.
Shrub Bog (SB) - Dominated by shrubby vegetation occupying typical bayhead sites. Often developing in bayheads destroyed by fire or other disturbance. Hydrology similar to that of bayhead communities.
Shrubgall (SG) - Wetlands dominated by shrubby vegetation occupying typical baygall sites and having similar hydrologies and soils.
Transitional Shrub (TS) - Dominated by transitional shrubby vegetation at upland margins of wetter community types or on clear cut hydric sites. Also develops on wet prairie sites which have been protected from fire. Wax myrtle (Myrica cerifera) and Baccharis halimnifolia are typical species.
Deep Marsh (DM) - Deep water wetlands dominated by a mixture of water lilies and deep water emergent species. Semi-permanently to perma-nently flooded.
Lakeshore Emergents (DM-LS) - Emergent vegetation growing along lake shores and usually semi-permanently flooded. Panicum hemitomon and species of Scirpus are most common.
Water Lilies (DM-N) - Floating leaved species in the genera Nymphaea, Nuphar, Nelumbo, Brasenia and Nymphoides. Usually semi-permanently to permanently flooded.
Shallow Marsh (SM) - Herbaceous or graminoid communities dominated by species such as sawgrass, maidencane, cattails, pickerel weed, arrowhead, or other grasses and broad leaved herbs. Occurs most often on organic soils that are subject to lengthy seasonal inunda-tion. Subject to occasional fire.
Wet Prairie (WP) - Communities of grasses, sedges, rushes, and herbs typically dominated by sand cordgrass, maidencane, or a mixture of species. Usually on mineral soils that are inundated for a relatively short duration each year, but with prolonged soil saturation. Subject to frequent fire.
Floating Marshes (FF) - Communities of free-floating plants (such as water hyacinth, water lettuce, or lemna) or floating mats of rhizomatous species (such as alligator weed or various grasses and sedges).
Submerged Aquatic Beds (AB) - Communities of aquatic plants rooted in the sediments of shallow water bodies and having the majority of their photosynthetic tissues below the water surface. Generally permanently flooded.
Freshwater Flats and Barren Areas (BA) - Sandy or muddy sites subject to occasional or regular inundation with less than 33% vegetation cover during the growing season.
Water (W) - Unvegetated or sparsely vegetated sites subject to prolonged or semi-permanent flooding. Includes lakes, streams, ponds and other water bodies.
Mangrove Forest (MF) - Forested saline wetlands dominated by one or more mangrove tree species (Rhizophoramangle, Avicennia germinans, or Laguncularia racemosa) growing on sites where they are capable of achieving tree stature. These communities may be further classified by dominant species or by forest physiognomy.
Shrub Mangrove (MS) - Sites dominated by one or more mangrove tree species growing on sites where they are prevented by natural processes (including climate, nutrients, and wave action) from achieving tree size. These communities may be further classified according to dominant tree species or by stand physiognomy.
Spartina alterniflora Marsh (SA) - Herbaceous saline wetlands dominated by smooth cordgrass, often in nearly pure stands. Typically occupies a zone between open water or tidal flat communities and a salt flat or black needle rush zone.
Juncus roemerianus Marsh (JR) - Herbaceous saline wetlands dominated by black needlerush, often in nearly pure stands. Typically occupies a zone between the lower smooth cordgrass zone and the high meadow community type.
Salt Flats (SF) - Communities developing on sandy, hypersaline soils upland from the Spartina or Juncus zone and which are characterized by concentric bands of vegetation developing in response to a salinity gradient. Consists of salt barrens (SF-B) and vegetated flats (SF-V).
Borrichia frutescens (BO) - Saline wetlands dominated by sea ox-eye. Most abundant in marshes of high salinity and low tidal amplitude and at higher elevations adjacent to high meadow communities.
High Meadow (HM) - High irregularly flooded herbaceous communities transitional between uplands and salt flats or Juncus roemerianus marshes and typically dominated by Spartina bakeri, S. patens, Borrichia frutescens, or other facultative species.
Tidal Flats (TF) - Non-vegetated, shallow-water habitats situated between the low and high tide limits. Substrate soft to semi- soft sand or mud. Found where sediments accumulate and usually bordered landward by Spartina alterniflora marshes and seaward by tidal channels or subtidal seagrass beds.
Shoreline and Beach (BE) - Non-vegetated sites occupying slopes exposed to periodic inundation, and wave action. Typically bordering open water areas and transitional to upland coastal dunes and scrub com-munities.
Seagrass Beds (SG) - Submerged beds of marine vascular plants dominated by Halodule beaudettei, Ruppia maritima, Thalassia testudinum or other species occurring below the intertidal zone.
Intermediate Marsh (IM) - Herbaceous wetlands of low or fluctuating salinity in which neither estuarine or freshwater species attain full dominance. Subject to significant freshwater inflows as well as to daily tides and saltwater influence.
UPLANDS (U) - Used for all areas that are not delineated as wetlands vegetation. May include drained areas, developed or farmed lands, and pine plantations on hydric soils. Hydrology may be xeric, mesic, or hydric.
CP Cabbage Palm PI Pines EX Outside of Mapping area
X excavated A artificial I impounded PI partially impounded D drained PD partially drained C clearcut CO old clearcut Y regenerative young growth, secondary succession S saline or salt influenced B burned HY occupying heavy clay soils
XY Component X is only slightly more dominant than Y X>Y Component X is dominant; Y is subdominant X*Y A small percent of Y occurs in X X/Y X is the overstory; Y is the understory X-Y Community X contains component species typically associated with Y