State of New State of New Jersey Jersey

1:2,400 Scale Hydrography 1:2,400 Scale Hydrography DataData

Integration with NHDIntegration with NHD

By: Seth Hackman, GIS Specialist - NJDEP

NJDEP

2002 Aerial Photography2002 Aerial Photography Digital imagery produced by BAE/ADR. Digital imagery produced by BAE/ADR. Keystone Aerial Surveys conducted the Keystone Aerial Surveys conducted the

flyover.flyover. Images produced at 1:2,400 scale, 1 ft. pixel Images produced at 1:2,400 scale, 1 ft. pixel

resolution, ground accuracy of +/- 4 ft.resolution, ground accuracy of +/- 4 ft. Imagery is available as an image service or Imagery is available as an image service or

for individual tile download through the NJ for individual tile download through the NJ State Clearinghouse – NJGIN State Clearinghouse – NJGIN

Also available from EROS Data CenterAlso available from EROS Data Center

NJDEP

2002 Hydro Delineations2002 Hydro Delineations Work was contracted to Work was contracted to

Aerial Information Aerial Information Systems (AIS) -- Redlands, Systems (AIS) -- Redlands, CA.CA.

Hydro linework was done Hydro linework was done in conjunction with the in conjunction with the 2002 land use/land cover 2002 land use/land cover update update

Previous GIS projects Previous GIS projects undertaken by AIS for State of undertaken by AIS for State of NJ include:NJ include:

- Land Use/Land Cover 1986

- Land Use/Land Cover Update - 1995/97

NJDEP

NJ Hydrography Update

Original 1986 Hydrography Original 1986 Hydrography source was USGS quadrangle data as DLG’ssource was USGS quadrangle data as DLG’s Currently available for download (Currently available for download (http://http://

www.state.nj.us/dep/gis/listall.htmlwww.state.nj.us/dep/gis/listall.html) )

NHD 1:24,000NHD 1:24,000 Used internallyUsed internally Good attributionGood attribution

2002 Hydrography (1:2,400)2002 Hydrography (1:2,400) Updated based on 2002 imageryUpdated based on 2002 imagery Accurate stream data photo-interpreted Accurate stream data photo-interpreted

(arcs)(arcs) Water Body data layer delineated (polygonal)Water Body data layer delineated (polygonal)

NJDEP

Stream Data Layer Spec’s:Stream Data Layer Spec’s:

Minimum mapping width for linear streams = 10 ft.Minimum mapping width for linear streams = 10 ft. Streams greater than 10 ft. but less than 30 ft. in width Streams greater than 10 ft. but less than 30 ft. in width

shall be delineated as a single line.shall be delineated as a single line. Streams greater than 30 feet in width will be captured Streams greater than 30 feet in width will be captured

as polygons. The stream boundary will be delineated as polygons. The stream boundary will be delineated within +/- 5 feet of the land-water interface.within +/- 5 feet of the land-water interface.

For all polygonal streams, an artificial stream For all polygonal streams, an artificial stream centerline (drainage path) will be digitized down the centerline (drainage path) will be digitized down the approximate middle of the polygon, with the correct approximate middle of the polygon, with the correct arc/node topology that can be related to upstream and arc/node topology that can be related to upstream and downstream flow direction analysis.downstream flow direction analysis.

NJDEP

Resources of DelineationResources of Delineation Time (and lots of it)Time (and lots of it) GeographyGeography StaffingStaffing Money!!!Money!!!

The benefits far outweigh The benefits far outweigh the problems!the problems!

NJDEP

Statistics of Change:

Original Hydro from DLG’s ©

1986

vs.

Streams 2002 (1:2,400)

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1986 Hydrogrpahy (DLG’s)1986 Hydrogrpahy (DLG’s)

NJDEP

1:24,000 NHD1:24,000 NHD

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2002 Hydrography 1:2,4002002 Hydrography 1:2,400

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Stream Situation Code

0- River bank/Water body (>30ft)1- Stream(10-30ft)2- River/Water Body Centerline3- Artificial Connector4- Ditches5- Indeterminate Wetland drainage

NJDEP

Water Body data layer Water Body data layer (polygonal)(polygonal)

The minimum mapping unit for non-linear The minimum mapping unit for non-linear water bodies is 1-acre.water bodies is 1-acre.

The minimum width for capturing linear The minimum width for capturing linear water bodies as polygons is 30 feet.water bodies as polygons is 30 feet.

Water bodies captured as polygons have Water bodies captured as polygons have been delineated within +/- 5 feet of the land-been delineated within +/- 5 feet of the land-water interface as interpreted on the 2002 water interface as interpreted on the 2002 imagery.imagery.

Water polygons delivered as separate layerWater polygons delivered as separate layer

NJDEP

Current Lakes & Streams

NJDEP

New Lakes & Streams

NJDEP

Integration with NHDIntegration with NHD

Our intent is to:Our intent is to: Implement NHD using one pilot Implement NHD using one pilot

watershed in NJ (using EPA grant watershed in NJ (using EPA grant funding)funding) Pass NHD24K attributes to new linework.Pass NHD24K attributes to new linework. Add new codes to new delineated streams Add new codes to new delineated streams

found NHD24K.found NHD24K. Use the 1:2,400 hydrography network Use the 1:2,400 hydrography network

for NJ as the “NHD Layer” for the for NJ as the “NHD Layer” for the state.state.

NJDEP

1.Produce NHD stewardship agreement between State of NJ and USGS.

2.Get trained in the latest tools and technologies for attribute transfer and coding for new stream lines.

3.Network with other states to share experiences and determine the best way forward.

4.Incorporate the needs of NJDEP Water Programs to add new themes and features to NHD Model for NJ.

What’s Next?What’s Next?

NJDEP

Thanks!Thanks!Contact Info: NJDEP, Bureau of GIS

Website: http://www.nj.gov/dep/gis

Phone: (609) 777-0672

E-mail: gisnet@dep.state.nj.us

• Seth Hackman – Project Manager

Phone: 609-633-1262

E-mail: seth.hackman@dep.state.nj.us