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Reaches are also defined on waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria established by the Federal Geographic Data Committee.NHDWaterbodies contain regions representing areal NHD hydrographic waterbody features. Some Waterbody features such as LakePond, Reservoir, and Estuary must have a reachcode. SwampMarsh may have a reachcode. Ice Mass and Playa do not have reachcodes.Field Descriptions:FDate - Date of last feature modification.Resolution - Source resolution. Currently NHD is available as separate resolutions. Plans are to develop a single-resolution database holding the highest resolution data with tools to allow for generalization.GNIS_ID \u2013 Unique identifier assigned by GNIS.GNIS_NAME \u2013 Proper name, specific term, or expression by which a particular geographic entity is known.AreaSqKm \u2013 Area of areal feature based on Albers Equal Area.REACH_CODE \u2013 Unique identifier composed of two parts: the first eight digits is the subbasin code as defined by FIPS 103; the next six digits are randomly assigned, sequential numbers that are unique within a subbasin.F_TYPE \u2013 Three-digit unique identifier of a feature type.F_TYPE Field Values are as follows:361 = Playa378 = Ice Mass390 = Lake/Pond436 = Reservoir466 = Swamp/Marsh493 = EstuaryF_CODE \u2013 Five-digit integer value composed of the feature type and combinations of characteristics and values.Source: https://nhd.usgs.gov/; https://nhd.usgs.gov/userguide.html", "geometryType": "esriGeometryPolygon", 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