NJDEP Open Water Areas of Hunterdon County, New Jersey 1986 (1:24000)

Citation:

Citation Information:

Originator: NJ Department of Environmental Protection (NJDEP), Office of Information Resources Management (OIRM), Bureau of Geographic Information and Analysis (BGIA)
Publication Date: 19981101
Title: NJDEP Open Water Areas of Hunterdon County, New Jersey 1986 (1:24000)
Edition: 1986
Geospatial Data Presentation Form: vector digital data
Publication Information:

Publication Place: Trenton, NJ
Publisher: DEP

Online Linkage: http://www.state.nj.us/dep/gis/digidownload/zips/lakes/hunlakes.zip

Description:

Abstract:
This data contains all the open water areas for this county as of 1986. Open water areas such as as lakes, ponds, tidal waters, reservoirs, bays, etc., are included. This file was created by reselecting the water series out of its LULC (land use/land cover) data. The following reselect was performed on LULC in ArcView to create this data: land_use greater than 5000 and land_use less than 6000 (the numeric codes refer to the Anderson classification system, and represent all codes that refer to bodies of water). Non-open water wetlands polygons can be found in the county's "Wetlands" data and the streams in its "Streams" data.
The county's LULC data was created by combining two separate data sets, the land use/land cover layer from the Integrated Terrain Unit Maps (ITUM) and the freshwater wetlands (FWW) layer generated under the New Jersey Freshwater Wetlands Mapping Program.

The ITUM land use/land cover was photo interpreted from 1986 color infrared (CIR) 1:58000 aerial photos, and delineated using a modified Anderson et al. 1976, classification system to 1:24000 rectified photo-basemaps. These basemaps complied with National Map Accuracy Standards (NMAS) as individual quadrangles but were not produced from a sophisticated aero-triangulation photogrammetric solution. Minimum mapping unit = 2.5 acres. The ITUM land use/land cover was integrated with three other sources (soils, USGS floodprone areas, and 1906 Atlas Sheet Geology) based on coincident features. The four data layers have subsequently been split out into four separate themes for distribution and use. Beginning in 1998, the NJDEP does not support the data as a single integrated ITUM theme but rather as four separate themes.

Freshwater wetlands delineations were made on 1986 orthophoto quarterquad basemaps (1:12000) by photo interpretation of 1986 CIR photos. The classification system used was a modified Cowardin system (Cowardin, et al., 1979). All freshwater wetland polygons greater than 1 acre in area and all linear freshwater wetland features greater than 10 feet in width were mapped. Only polygons are included in county's wetlands shapefile, linear wetlands are also shown separately in their own shapefile. The 1986 quarterquad basemaps meet NMAS and are orthophotos.

Purpose:
This data was reselected from the county's LULC to specifically contain only open water areas. The LULC are an integration of the 1986 land use/ land cover and FWW data layers. The 1986 land use/land cover information was developed as one of the fundamental data sets needed for environmental analysis and GIS mapping based on a department wide needs assessment.
The FWW theme was mapped to fulfill a requirement of the Freshwater Wetlands Act of 1987 (Refer to metadata for FWW). The FWW data was subsequently integrated into the existing 1986 land use/land cover for this county to produce this county's LULC theme.

Tidal (estuarine) wetlands were not mapped as part of NJDEP's FWW mapping. These polygons were delineated as part of the 1986 land use/land cover mapping.

This county's open water area (and LULC) polygons are intended to serve as a resource for analysis rather than regulatory delineations. The NJDEP may change the linework based on more in depth analysis and field inspection for regulatory purposes.

Supplemental Information:
This data is a subset of the county LULC, which is an integration of the datasets 1986 land use/land cover and FWW. Please, refer to the Process Description of this metadata for a description of the two primary data sets and the integration process.
For additional Cross Reference information, please refer to the following documents:

ANDERSON.TXT-Land use / land cover 4-digit code descriptions in text format
FWW.TXT-Wetlands Cowardin alpha-numeric classification system in text format
METHODS.TXT-Procedures used for combining Integrated Terrain Unit Mapping (ITUM) Land Use/Land Cover and NJ Freshwater Wetlands coverages in text format.
ITUM.TXT-Detailed description of the ITUM production by county with methods in text format.

Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 1986

Currentness Reference: ground condition

Status:

Progress: Complete
Maintenance and Update Frequency: Irregular

Spatial Domain:

Bounding Coordinates:

West Bounding Coordinate: -75.19304
East Bounding Coordinate: -74.70397
North Bounding Coordinate: 40.7901
South Bounding Coordinate: 40.33995

Keywords:

Theme:

Theme Keyword Thesaurus: none
Theme Keyword: hydrography
Theme Keyword: rivers
Theme Keyword: lakes
Theme Keyword: ponds
Theme Keyword: tidal waters
Theme Keyword: reservoirs
Theme Keyword: bays
Theme Keyword: open water areas
Theme Keyword: water
Theme Keyword: wetlands
Theme Keyword: land cover
Theme Keyword: Cowardin
Theme Keyword: land use
Theme Keyword: Anderson
Theme Keyword: NJDEP

Place:

Place Keyword Thesaurus: none
Place Keyword: Hunterdon
Place Keyword: New Jersey
Place Keyword: Hunterdon County
Place Keyword: NJ

Access Constraints: none
Use Constraints:
Data Distribution Agreement (NJDEP) Agrees to abide by the terms and conditions of the following:

I. Description of Data to be Provided
The data provided herein are distributed subject to the following conditions and restrictions.

Subject Data Layers

For all data contained herein, (NJDEP) makes no representations of any kind, including, but not limited to, the warranties of merchantability or fitness for a particular use, nor are any such warranties to be implied with respect to the digital data layers furnished hereunder. NJDEP assumes no responsibility to maintain them in any manner or form.

II. Terms of Agreement

1. Digital data received from the NJDEP are to be used solely for internal purposes in the conduct of daily affairs.
2. The data are provided, as is, without warranty of any kind and the user is responsible for understanding the accuracy limitations of all digital data layers provided herein, as documented in the accompanying Data Dictionary and Readme files. Any reproduction or manipulation of the above data must ensure that the coordinate reference system remains intact.
3. Digital data received from the NJDEP may not be reproduced or redistributed for use by anyone without first obtaining written permission from the NJDEP. This clause is not intended to restrict distribution of printed mapped information produced from the digital data.
4. Any maps, publications, reports, or other documents produced as a result of this project that utilize NJDEP digital data will credit the NJDEP's Geographic Information System (GIS) as the source of the data with the following credit/disclaimer:

"This (map/publication/report) was developed using New Jersey Department of Environmental Protection Geographic Information System digital data, but this secondary product has not been verified by NJDEP and is not state-authorized."

5. Users shall require any independent contractor, hired to undertake work that will utilize digital data obtained from the NJDEP, to agree not to use, reproduce, or redistribute NJDEP GIS data for any purpose other than the specified contractual work. All copies of NJDEP GIS data utilized by an independent contractor will be required to be returned to the original user at the close of such contractual work.

Users hereby agree to abide by the use and reproduction conditions specified above and agree to hold any independent contractor to the same terms. By using data provided herein, the user acknowledges that terms and conditions have been read and that the user is bound by these criteria.

Point of Contact:

Contact Information:

Contact Organization Primary:

Contact Organization: New Jersey Department of Environmental Protection, Bureau of Geographic Information and Analysis

Contact Position: GIS Specialist, Data/Metadata Manager
Contact Address:

Address Type: mailing and physical address
Address: 401 East State Street, Box 428- 1st Floor
City: Trenton
State or Province: NJ
Postal Code: 08625
Country: USA

Contact Voice Telephone: 609-633-2668
Contact Electronic Mail Address: John.Bocchino@dep.state.nj.us

Browse Graphic:

Browse Graphic File Name: http://www.state.nj.us/dep/gis/digidownload/images/lakes/hunlakes.gif
Browse Graphic File Description: preview of county lakes
Browse Graphic File Type: GIF

Native Data Set Environment: ArcInfo 7.x converted to ArcView 3.x shapefile

Attribute Accuracy:

Attribute Accuracy Report:
The following are the QA procedures applied or methods taken to insure the accuracy of the attributes for data related to the open water area for this county:
ITUM land use/land cover: Frequencies run to check for invalid codes. Invalid codes corrected. Nodeerrors and labelerrors functions run and corrected. Some field checking was performed. Land use codes containing ##09 require field verification. Refer to itum.txt provided within zip file.

FWW : Some field checking was done on each quarterquad, minimum of four points. Contractor's post-scanning mylar proof sheets, and digital files, were checked by NJDEP staff against original delineation mylars for completeness and accuracy. Line and polygon codes on proof sheets and in digital files were also checked against original delineation mylars. Errors were corrected to achieve 100% coding accuracy.

This open water area layer was checked for valid codes, labelerrors and nodeerrors. Area calculations done on all non-tidal wetlands mapped for the FWW mapping effort to insure inclusion of all FWW polygons and FWW codes in final LULC layer for this county. On line visual comparisons of final integrated LULC layer with original FWW and land use/land cover layers also performed. Polygons below .25 acres generated through the integration process were eliminated.

Reselected polygons from this county's open water area were checked against its original LULC layer to insure inclusion of all open water wetlands polygons in this layer.

Logical Consistency Report:
The county's completed LULC layer was checked for valid codes, label errors and node errors. Area calculations done on all non-tidal wetlands mapped for the FWW mapping effort to insure inclusion of all FWW polygons and FWW codes in final LULC layer. On-line visual comparison of the final integrated LULC layer with original FWW and land use/land cover layers was also performed. Polygons below .25 acres generated through the integration process were eliminated. Slivers over .25 acres, however, have been left in the LULC theme. While many of these slivers could be merged into adjacent polygons, others are real features that are correctly classified. Most sliver polygons need to be analyzed on a case by case basis before a determination as to whether or not they should be eliminated, re-coded or retained. As this county's LULC and WETLANDS themes are updated, sliver polygons will be investigated and corrected. The overall areal extent of the slivers does not greatly alter the use of this data.
Completeness Report:
The project as originally designed was completed for each county. Refer to the Sections 1.2.1 "Abstract", 1.2.3 "Supplemental Information" and 2.5.2.1 "Process Description" within this metadata for detailed information concerning omissions, selection criteria, generalization, definitons used, and other rules used to derive the data set.
Positional Accuracy:

Horizontal Positional Accuracy:

Horizontal Positional Accuracy Report:
National Map Accuracy Standards (NMAS) -- Data mapped to basemaps which met NMAS at the mapping scales. Node errors, label errors and slivers larger than .25 acres were resolved (see Section 1.2.3 Supplemental Information). 24000 scale features are within +/- 80 feet or better from locations on the 1986 photoquads. 12000 scale features from FWW are +/- 33 feet or better from locations on the quarterquads.
Vertical Positional Accuracy:

Vertical Positional Accuracy Report: N/A

Lineage:

Source Information:

Source Citation:

Citation Information:

Originator: NJ Department of Environmental Protection (NJDEP), Office of Information Resources Management (OIRM), Bureau of Geographic Information and Analysis (BGIA)
Publication Date: 1997
Title: NJDEP Land Use, Land Cover (LULC) shapefiles by county
Edition: 1997
Geospatial Data Presentation Form: vector digital data
Publication Information:

Publication Place: Trenton, NJ
Publisher: NJDEP

Other Citation Details:
The LULC shapefile for each county was created by combining two separate data sets, the land use/land cover layer from the Integrated Terrain Unit Maps (ITUM) and the freshwater wetlands (FWW) layer generated under the New Jersey Freshwater Wetlands Mapping Program. The Arc/Info LULC coverages have been converted to ArcView shapefiles for distribution.
The ITUM shapefiles for each county was processed during 1993-1994 based on 1986 CIR aerial photos and the FWW was processed during 1988-1993 and delineations were made on 1986 orthophoto quarterquad basemaps by photo interpretation of 1986 CIR photos.

Source Scale Denominator: 24000
Type of Source Media: vector digital data
Source Time Period of Content:

Time Period Information:

Single Date/Time:

Calendar Date: 1986
Time of Day: Unknown

Source Currentness Reference: ground condition

Source Citation Abbreviation: LULC
Source Contribution:
Note: Open water areas (lakes, ponds, reservoirs, etc.) were reselected from each county's LULC shapefile. It is, however, important to note that the source LULC is a combination of the 1:24000 Integrated Terrain Unit Maps (ITUM) and the 1:12000 scale Freshwater Wetlands (FWW) layer. Therefore, the detailed non-tidal wetland FWW delineations are considered accurate at a scale of 1:12000.
Process Step:

Process Description:
The 1986 land use/land cover theme and the FWW theme were mapped as independent projects for different purposes. From early on, the NJDEP planned to integrate the two layers even though the standard for FWW mapping was much tighter. The integration of these two data layers was completed in 1997.
The 1986 land use/land cover layer served as the base layer because it represents a more complete data layer since all areas within the state were mapped. The FWW theme was used to add detail to the 1986 theme because the FWW was produced at a larger mapping scale with extensive fieldwork and with smaller minimum polygon size. Therefore the detailed non-tidal wetland FWW delineations were integrated in their entirety into the 1986 land use/land cover layer for each county, and the original non-tidal ITUM wetland delineations eliminated. This resulted in a LULC for each county.

All of the detail of the polygon FWW maps, both in the linework (polygons) and coding (Cowardin classification) has been retained in this county's LULC product. (The single line freshwater wetland features are not included in this integration). However, since the 1986 land use/land cover layer was classified according to the modified Anderson et al. (1976) classification system, the wetland FWW polygons have been given a more general Anderson (4 digit) classification code in the LULC theme. If needed, this county's LULC freshwater wetland polygons can be interpreted at a level of detail similar to the surrounding non-wetland areas.

The integration process created numerous slivers in the final LULC theme. Slivers under .25 acres were generally eliminated. Slivers over .25 acres, however, have been left in the LULC theme. While many of these slivers could be merged into adjacent polygons, others are real features that are correctly classified. Most sliver polygons need to be analyzed on a case by case basis before a determination as to whether or not they should be eliminated, re-coded or retained. As this county's LULC and WETLANDS themes are updated, sliver polygons will be investigated and corrected. The overall areal extent of the slivers does not greatly alter the use of this data.

The wetland definition and classification system commonly referred to as the Cowardin system was developed under the auspices of the U.S. Fish and Wildlife Service. It is described in detail in "The Classification of Wetlands and Deepwater Habitats of the United States", Cowardin , et al., 1979. The attribute item COWARDIN represents a wetlands type described under this system.

Through this classification scheme, wetlands are first placed into one of five basic ecological systems: Marine, Estuarine, Riverine, Palustrine, and Lacustrine. Each of these systems may then be divided further into subsystems, classes, and subclasses. Special modifiers relating to water regime, water chemistry, soil characteristics and other special site characteristics can also be used to further define the wetland type.

Each of these categories is represented by either an alpha or a numeric character, with the wetland type for any specific wetland area being fully described by combining all alpha/numeric codes for any of the characteristics that apply.

For example, the water body classed as POWHx is interpreted as:

P (Palustrine) OW (Open Water) H (Permanently Flooded) x (Excavated)

Note that not all categories and descriptors are applicable to every wetland type. Also, mixtures of wetlands can also be identified, with the major types separated by a '/', as with PSS4Bh/PFO4Bh.

The fww.txt (included within zip file) lists all categories used in the Cowardin system, and their alpha or numeric character symbol. This file can then be used to interpret the wetland type described by the COWARDIN attribute in this data layer.

The Anderson et al. 1976 (modified 1999) classification system is a hierarchical system based on four digits. The four digits represent three levels of classification: Level I, general; Level II, descriptive, and Level III, detailed. Therefore the first digit in the code is the Level I general classification. The first two digits reveal the Level II descriptive code and the four digits represent the detailed Level III code.

For example the code 5410 represents:

5### Water 54## Water, Tidal Waters 5410 Water, Tidal Waters, Bay/Estuary

Process Date: 1999

Cloud Cover: 0

Direct Spatial Reference Method: Vector
Point and Vector Object Information:

SDTS Terms Description:

SDTS Point and Vector Object Type: G-polygon
Point and Vector Object Count: 631

Horizontal Coordinate System Definition:

Planar:

Grid Coordinate System:

Grid Coordinate System Name: State Plane Coordinate System 1983
State Plane Coordinate System:

SPCS Zone Identifier: 2900
Transverse Mercator:

Scale Factor at Central Meridian: 0.999975
Longitude of Central Meridian: -74.5
Latitude of Projection Origin: 38.8333333333
False Easting: 150000
False Northing: 0

Planar Coordinate Information:

Planar Coordinate Encoding Method: Coordinate Pair
Coordinate Representation:

Abscissa Resolution: 1
Ordinate Resolution: 1

Planar Distance Units: svy_ft

Geodetic Model:

Horizontal Datum Name: North American Datum of 1983
Ellipsoid Name: Geodetic Reference System 80
Semi-major Axis: 6378206
Denominator of Flattening Ratio: 294.9786982

Detailed Description:

Entity Type:

Entity Type Label: Open Water Areas
Entity Type Definition: County lakes, ponds, tidal waters, reservoirs, bays, etc.
Entity Type Definition Source: NJDEP

Attribute:

Attribute Label: ACRES
Attribute Definition: Total Acres (polygon)
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Unique Value

Attribute:

Attribute Label: AREA
Attribute Definition: Total Area (polygon)
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Unique Value

Attribute:

Attribute Label: CLASS
Attribute Definition: Numeric Code representing Cowardin alpha-numeric labels for fresh water wetlands (FWW) polygons.
Attribute Definition Source: Cowardin
Attribute Domain Values:

Unrepresentable Domain: Alpha-numeric labels based on Cowardin code

Attribute:

Attribute Label: COWARDIN
Attribute Definition: Alpha-numeric label defining FWW types. Refer to fww.txt (provided within zip file) for further information.
Attribute Definition Source: Cowardin
Attribute Domain Values:

Codeset Domain:

Codeset Name: Cowardin alpha-numeric label
Codeset Source: US Fish and Wildlife

Attribute:

Attribute Label: HUNLULC_
Attribute Definition: ESRI Generated Identification Field
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Unique Value

Attribute:

Attribute Label: HUNLULC_ID
Attribute Definition: ESRI Generated Identification Field
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Unique Value

Attribute:

Attribute Label: LABEL
Attribute Definition: A character description of the land use code. For example, Residential Land, Coniferous Forest, Extractive Mining, etc)
Attribute Definition Source: NJDEP
Attribute Domain Values:

Unrepresentable Domain: Character description of land use code

Attribute:

Attribute Label: LAND_USE
Attribute Definition: Land Use / Land Cover 4 digit code. This number corresponds to a specific category in the Anderson land use classification system.
Attribute Definition Source: NJDEP

Attribute:

Attribute Label: LEVEL1
Attribute Definition: Generalizd level 1 land use description. For example, Urban, Forest, Barren, etc.
Attribute Definition Source: NJDEP
Attribute Domain Values:

Enumerated Domain:

Enumerated Domain Value: Water
Enumerated Domain Value Definition: Assigned Land Use Description
Enumerated Domain Value Definition Source: Unknown

Attribute:

Attribute Label: LUCODE
Attribute Definition: Numberic code representing Leveli
Attribute Definition Source: NJDEP

Attribute:

Attribute Label: PERIMETER
Attribute Definition: Perimeter (polygon)
Attribute Definition Source: ESRI
Attribute Domain Values:

Unrepresentable Domain: Unique Value

Distributor:

Contact Information:

Contact Organization Primary:

Contact Organization: NJDEP/OIRM/BGIA

Contact Address:

Address Type: mailing and physical address
Address: 401 East State Street, First Floor, PO Box 428
City: Trenton
State or Province: New Jersey
Postal Code: 08625-0428
Country: USA

Contact Voice Telephone: 609-984-2243
Contact Facsimile Telephone: 609-292-7900
Contact Instructions: Call 609-984-2243 with questions concerning only the acquisition/download of this data set. Call the metadata reference contact with questions concerning the data.

Resource Description: County Open Water Areas
Distribution Liability: See Use Constraints
Standard Order Process:

Digital Form:

Digital Transfer Information:

Format Name: AVSHP
Format Version Number: 3.1
File Decompression Technique: WinZip

Digital Transfer Option:

Offline Option:

Offline Media: CD-ROM
Recording Format: ISO 9660

Digital Transfer Option:

Online Option:

Computer Contact Information:

Network Address:

Network Resource Name: http://www.state.nj.us/dep/gis/lakesshp.html

Online Computer and Operating System: n/a

Fees: Download Free
Ordering Instructions: none

Standard Order Process:

Fees: none

Metadata Date: 11/30/2000
Metadata Review Date:
Metadata Future Review Date:
Metadata Contact:

Contact Information:

Contact Person Primary:

Contact Person: Lou Jacoby
Contact Organization: NJDEP Bureau of Geographic Information and Analysis

Contact Address:

Address Type: Mailing and Physical Address
Address:
NJDEP 401 East State Street, PO Box 428

City: Trenton
State or Province: NJ
Postal Code: 08625-0428
Country: USA

Contact Voice Telephone: 609-984-2243
Contact Facsimile Telephone: 609-292-7900
Contact Electronic Mail Address: Lou.Jacoby@dep.state.nj.us

Metadata Standard Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version: FGDC-STD-001-1998
Metadata Extensions: