Parent Layer: Lake Worth Lagoon Seagrass Mapping Project (3016)

Name: GIS_3016B

Display Field: UniqueID

Type: Feature Layer

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Description: Coordinate data (NAD 1983 HARN State Plane Florida East) for the 1,508 ground-truthing sites (1,000 original sites and 508 new bed edge sites) were imported into ArcGIS and overlaid on top of a copied shapefile of the 2007 seagrass polygons. The first adjustment to the 2007 seagrass polygons was extension of the seagrass bed edges in areas where seagrass had expanded waterward of the 2007 edge, and there were a sufficient number of ground-truthing sites for extrapolation of bed edge expansion (“b” sites). Seagrass bed edge expansion was limited to the distance of the survey transect (30 m). Once polygons were adjusted for areas of seagrass expansion, several polygons were then split based on the Braun-Blanquet (BB) cover scores of the 2013 ground-truthing sites within the polygon. At locations where the seagrass bed had retreated from the 2007 edge (“a” sites), polygons were split to remove the unvegetated areas from the areas where seagrass was observed only if a sufficient number of ground-truthing sites were sampled in the polygon to suggest complete loss of seagrass cover in the area. Additionally, polygons were split to separate areas with different BB cover scores. If water depth appeared to be the controlling factor in seagrass occurrence within a specific polygon, the polygon was split along a consistent depth contour of seagrass cover and/or occurrence using the 2002-2003 bathymetry merge contour provided by PBCERM. Bathymetry contours used to split polygons were dependent upon seagrass cover scores at the 2013 ground-truthing sites; other factors, such as sediment type, Secchi depth readings, qualitative transect notes, were also used to determine the most appropriate depth contour line for splitting seagrass cover within polygons. Note: Zero (0) values within the attribute fields (Alias names) 'DEPTH_ft', 'DEPTH_TIDECORR', 'DEPTH MLLW', DEPTH_NAVD88', 'NAVD_NOAA', 'VISIBILITY', ‘SECCHI_1’, ‘SECCHI_2’, ‘AVG_SECCHI’, ‘SALINITY_ppt’, and ‘TEMP’ are not true values of zero. Zero values within these fields represent sites where this data was unavailable. The zero values within these fields were not used in calculating averages for associated polygons in the 2013 Ground-truthing map.For a complete description of 2013 seagrass ground-truthing and map creation methods and results, refer to the associated ‘2013 Lake Worth Lagoon Seagrass Mapping Report’ (CEG, 2014).

Copyright Text: Seagrass bed ground-truthing field verification, data collection, and map development were completed from July 2, 2013 to January 10, 2014 by Coastal Eco-Group Inc. Work was performed through a sub-contract agreement with Coast and Harbor Engineering Inc. for Palm Beach County Department of Environmental Resource Management.

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )
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