National Hydrography Dataset (NHD) Points

Abstract

NHD Points represents hydrographic landmark point features.

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

areasqkm

elevation = Feature elevation (Integer)

reachcode = 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, length 14.

ftype = 3-digit feature code. (Integer)

Code	Description
343	DamWeir
367	Gaging Station
369	Gate
398	Lock Chamber
431	Rapids
436	Reservoir
441	Rock
450	SinkRise
458	SpringSeep
485	Water IntakeOutflow
487	Waterfall
488	Well

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