NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation.
The NHD was created to assist scientists in modeling hydrologic features and is also useful for cartographic mapping purposes. The geometric features that came from the USGS DLG files, combined with the flow direction, reach codes, and other attributes taken from the EPA RF3 file, make the NHD a powerful modeling tool.
USGS, Florida Water Management Districts, Florida Department of Environmental Protection
Florida Department of Environmental Protection
hydrography, water, lakes, streams, rivers, estuaries
Estimated to meet 1:24,000 National Map Accuracy Standards (+/- 40 feet)
If the source for elevation is 7.5 minute topo map, estimated to be one half of a contour, or +/- 2.5 feet.
ESRI File Geodatabase
Albers Florida HARN
permanent_identifier = Unique ID
fdate = Date of last feature modification.
resolution = Source resolution. All values = 2
gnis_id = USGS Geographic Names Information System (GNIS) ID
gnis_name = USGS Geographic Names Information System (GNIS) Name
ftype = 3-digit feature code. (Integer)
|503||Sounding Datum Line|
fcode = 5-digit feature code. Extra two digits provide a more detailed description of the feature. (Integer)