National Hydrography Dataset (NHD) Lines

Abstract

NHD Lines represent linear NHD hydrographic landmark features used for cartographic representation.

Purpose

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.

Time Period of Content

Beginning date: 1990s
Ending date: 2016

Publish Date

2016-05-11

Originator

USGS, Florida Water Management Districts, Florida Department of Environmental Protection

Publisher

Florida Department of Environmental Protection

Theme Keywords

hydrography, water, lakes, streams, rivers, estuaries

Place Keywords

Florida

Source Scale

1:24,000

Horizontal Accuracy

Estimated to meet 1:24,000 National Map Accuracy Standards (+/- 40 feet)

Vertical Accuracy

If the source for elevation is 7.5 minute topo map, estimated to be one half of a contour, or +/- 2.5 feet.

Process Steps

Format

ESRI File Geodatabase

Format Details

Projection

Albers Florida HARN

Field Names

permanent_identifier = Unique ID

fdate = Date of last feature modification.

resolution = Source resolution. All values = 2

Code | Description1 | Description2 ----: | ----- 1 | Local | >1:12,000 2 | High | 1:24,000/12,000 3 | Medium | 1:100,000

gnis_id = USGS Geographic Names Information System (GNIS) ID

gnis_name = USGS Geographic Names Information System (GNIS) Name

lengthkm

ftype = 3-digit feature code. (Integer)

Code	Description
343	Dam/Weir
369	Gate
398	Lock Chamber
411	Nonearthen Share
434	Reef
483	Wall
487	Waterfall
503	Sounding Datum Line

fcode = 5-digit feature code. Extra two digits provide a more detailed description of the feature. (Integer)

Distribution Info

http://geodata.dep.state.fl.us/

http://publicfiles.dep.state.fl.us/otis/gis/data/FLORIDA_NHD.zip