Impervious Surface from Land Use/Land Cover 2012 Update, Edition 20150217 (Land_lu_2012_is)

Metadata also available as


New Jersey Department of Environmental Protection (NJDEP), Division of Information Technology (DOIT), Bureau of Geographic Information Systems (BGIS)
Publication_Date: 20150217
Impervious Surface from Land Use/Land Cover 2012 Update, Edition 20150217 (Land_lu_2012_is)
Geospatial_Data_Presentation_Form: vector digital data
Publication_Place: Trenton, NJ
Publisher: NJ Department of Environmental Protection (NJDEP)
The Impervious Surface layer is taken from the Land Use 2012 data set. What is meant by impervious surface is material such as concrete and asphalt that comprise roadways, parking areas, sidewalks and buildings. As the land use/land cover of each polygon was mapped from 2012 aerial photography, a visual estimate was also made of the amount of impervious surface in each. This estimate was recorded as a percentage of the total polygon area, in 5% increments, which are depicted here. These percentages can be used to determine the total acreage of impervious surface in any area of interest.
The 2012 LU/LC data set is the fifth in a series of land use mapping efforts that was begun in 1986. Revisions and additions to the initial baseline layer were done in subsequent years from imagery captured in 1995/97, 2002, 2007 and 2012. This present 2012 update was created by comparing the 2007 LU/LC layer from NJDEP's Geographic Information Systems (GIS) database to 2012 color infrared (CIR) imagery and delineating and coding areas of change. Work for this data set was done by Aerial Information Systems, Inc., Redlands, CA, under direction of the New Jersey Department of Environmental Protection (NJDEP), Bureau of Geographic Information System (BGIS). LU/LC changes were captured by adding new line work and attribute data for the 2012 land use directly to the base data layer. All 2007 LU/LC polygons and attribute fields remain in this data set, so change analysis for the period 2007-2012 can be undertaken from this one layer. The classification system used was a modified Anderson et al., classification system. An impervious surface (IS) code was also assigned to each LU/LC polygon based on the percentage of impervious surface within each polygon as of 2007. Minimum mapping unit (MMU) is 1 acre.
ADVISORY: This metadata file contains information for the 2012 Land Use/Land Cover (LU/LC) data sets, which were mapped by USGS Subbasin (HU8). There are additional reference documents listed in this file under Supplemental Information which should also be examined by users of these data sets.
As stated in this metadata record's Use Constraints section, 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. By downloading this data, user agrees to the data use constraints listed within this metadata record.
The data set will provide information for regulators, planners, and others interested in LU/LC changes, and allow them to quantify those changes over time using GIS.
The use of the updated 2012 LU/LC in land use analyses will provide a means of monitoring "the health of the citizens and ecosystems of New Jersey" through the use of diverse applications.
This data set is intended to serve as a resource data set. The NJDEP may change the line work or polygon coding based on more in depth analysis and field inspection.
Several supplemental documents are available that detail the procedures used to create this update and the previous updates done in 1986, 1995, 2002 and 2007. Users of any of these data sets may find it helpful to review these documents before using the data. Each update, including this 2012 data set, is created by editing the previous version, so an understanding of any procedures used in the previous updates may be helpful in interpreting the present version.
A detailed discussion of specific procedures used to create this updated data set is included in:
General comments on previous updates are included in:
Note that the original 1986 baseline data layer was composed of two originally separate layers; the LU/LC from the Integrated Terrain Unit Mapping (ITUM) project and the Freshwater Wetlands (FWW) data from the New Jersey Freshwater Wetlands Mapping Project. NJDEP integrated the two themes into one coverage in 1996. The specific process used to develop the original ITUM data set is discussed in The process used to integrate the ITUM LU/LC and FWW coverages into one theme, including a discussion of the Upper Wetlands Boundary (UWB) line in the process, is discussed in detail in the
Also note that included in the baseline LU/LC data set, as part of the original land use layer from the ITUM mapping, were the statewide hydrology boundaries. These hydrologic boundaries were replaced during the 2002 update with boundaries mapped from the 2002 imagery.
A description of the land use codes used in this data set is given in
This document is edited version of 'A Land Use and Land Cover Classification System for Use with Remote Sensor Data', U. S. Geological Survey Professional Paper 964, 1976.
The COWARDIN86 and CLASS86 codes used to describe the non-tidal wetlands are codes generated during the original FWW mapping program. These Have been removed in the 2012 update.
All supplemental documents are available in HTML format as follows:
Calendar_Date: 2012
Currentness_Reference: Ground condition
Progress: Complete
Maintenance_and_Update_Frequency: Unknown
West_Bounding_Coordinate: -75.592927
East_Bounding_Coordinate: -73.890363
North_Bounding_Coordinate: 41.357565
South_Bounding_Coordinate: 38.855893
Theme_Keyword_Thesaurus: None
Theme_Keyword: land use
Theme_Keyword: land cover
Theme_Keyword: wetlands
Theme_Keyword: impervious surface
Theme_Keyword: change analysis
Theme_Keyword: wma
Theme_Keyword: water quality
Theme_Keyword: Anderson
Theme_Keyword: NJDEP
Theme_Keyword: watersheds
Theme_Keyword: hydrologic unit 8
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: planningCadastre
Theme_Keyword_Thesaurus: NJGIN
Theme_Keyword: njfw_lulc
Theme_Keyword_Thesaurus: User
Theme_Keyword: Land_lu_2012
Theme_Keyword: lulc2007
Place_Keyword_Thesaurus: None
Place_Keyword: New Jersey
Place_Keyword: NJ
Temporal_Keyword_Thesaurus: None
Temporal_Keyword: 2012
Temporal_Keyword: 2007
By obtaining data, users must abide by special use constraints. In most cases, a downloadable shapefile (.zip) version of this layer is also available. Information to download the shapefile can be found in the Distribution Section of this metadata record. This data layer is shown in the NJDEP's NJ-GeoWeb mapping application accessible through the Online Linkage:
New Jersey Department of Environmental Protection (NJDEP) Data Distribution Agreement. The data provided herein are distributed subject to the following conditions and restrictions: NJDEP assumes no responsibility to maintain them in any manner or form and disclaims any duty or obligation to either maintain availability of or to update the data. Terms of Agreement 1. All data is provided, as is, without any representation or warranty of any kind, implied, expressed or statutory including, but not limited to, the warranties of non-infringement of third party rights, title, merchantability or fitness for a particular use, freedom from computer virus nor are any such warranties to be implied with respect to the digital data layers furnished hereunder. User is responsible for understanding the accuracy limitations of all digital data layers provided herein, as documented in the accompanying cross-reference files (see SUPPLEMENTAL INFORMATION). Any reproduction or manipulation of the above data must ensure that the coordinate reference system remains intact. 2. Digital data received from the NJDEP may not be reproduced or redistributed without all the metadata provided. 3. Any maps, publications, reports, or other documents produced as a result of this project that utilize this 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 or endorsed.' 4. NJDEP makes no warranty that digital data are free of Copyright or Trademark claims or other restrictions or limitations on free use or display. Making a copy of this data may be subject to the copyright of trademark laws.
Contact_Person: Craig Coutros
Contact_Organization: NJDEP/BGIS
Contact_Position: GIS Specialist
Address_Type: mailing and physical address
Address: 401 East State Street, PO Box 420
City: Trenton
State_or_Province: NJ
Postal_Code: 08625-0428
Contact_Voice_Telephone: 609-777-0672
Contact_Facsimile_Telephone: 609-292-7900
NJ Department of Environmental Protection (NJDEP), Division of Information Technology (DOIT), Bureau of Geographic Information System (BGIS)

Targeted windshield field surveys done by the contractor during data preparation. NJDEP checked for invalid attribute codes and corrected as needed. Edgematching to adjacent data layers checked through visual inspection of adjacent data sets, and through running topological checks.
Polygon topology exists. Data were reviewed for correct topological structure, and for delineation and coding accuracies.
Data is available for 13 Hydrologic Units - HU8; Subbasins of New Jersey as FINALS.
Features mapped from digital imagery having a ground accuracy of +/- four feet.
Vertical_Positional_Accuracy_Report: NA
Originator: PhotoScience, Inc.
Publication_Date: 201303
Title: New Jersey 2012 - 2013 Orthophotography
Geospatial_Data_Presentation_Form: raster digital data
Publication_Place: Trenton, NJ
NJ Office of Information Technology (NJOIT), Office of Geographic Information Systems (OGIS)
Source_Scale_Denominator: 2400
Type_of_Source_Media: Digital and/or Hardcopy Resources
Beginning_Date: 201203
Ending_Date: 201303
Source_Currentness_Reference: ground condition
Source_Citation_Abbreviation: NJ 2012-13 Orthos
Land use/land cover for 2012 was digitized directly from the 2012-13 digital imagery using interactive editing
The 2007 land use/land cover data set was displayed over 2012 CIR digital imagery. New line work and codes needed to describe the land use conditions interpreted from the 2012 imagery were added directly to the 2007 layer through interactive editing. Photo-interpretation, interactive editing, field surveys and initial QA/QC done by Aerial Information Systems, Redlands, CA, under the direction of the NJDEP/BGIS.
The baseline 2007 data sets edited in this project were prepared by NJDEP/BGIS, from the original 2007 Land Use/Land Cover Update layers. The original layers included both 2007 and 2002 land use codes and linework. The 2002 codes and linework were removed by dissolving on the critical 2007 land use attributes. This produced layers that included only the 2007 codes and linework. It was these dissolved layers that were edited in this present project . Final QA/QC and final data set formatting for the 2012 update layers was done by NJDEP/BGIS.
Land use/land cover in 2012 was captured by adding additional line work and codes to the base layer, and filling in specific attribute fields that describe the 2012 land use/land cover ground conditions. All 2007 codes and line work remain in the data set so that change analysis can be performed on all polygons using this one updated data set. The 2007 polygons and codes were updated if it was felt that original mapped lines or land use classifications of any 2007 polygon needed to be modified based on the better 2012 imagery. In addition to the lu/lc codes, an impervious surface estimate was made for every polygon. This was a visual estimate and not a measured value. Data sets were processed and delivered by USGS Subbasin (HU8).
Process_Date: 20150217
To improve the performance of the web applications displaying the 2012 impervious surface data, it was necessary to create a new simplified layer that included only the minimum number of polygons and attributes needed to represent the 2012 impervious surface conditions. This new layer, IS12, was created using the following steps:
The 2012 impervious surface coverage, IS12, was created by dissolving on the field, IS12. Error checks as described above were run on the dissolved coverage, any needed corrections made, and the coverage IS12 was then loaded into the SDE geo-database for use in the web applications.

Direct_Spatial_Reference_Method: Vector
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 190080

Grid_Coordinate_System_Name: State Plane Coordinate System 1983
SPCS_Zone_Identifier: 2900
Planar_Coordinate_Encoding_Method: coordinate pair
Abscissa_Resolution: 0.000410
Ordinate_Resolution: 0.000410
Planar_Distance_Units: survey feet
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 1.000000
Altitude_Distance_Units: feet
Explicit elevation coordinate included with horizontal coordinates

Entity_Type_Label: lulc2012 impervious surface
Entity_Type_Definition: land use/land cover 2012 update
Entity_Type_Definition_Source: NJDEP/DOIT/BGIS
Attribute_Label: OBJECTID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Sequential unique whole numbers that are automatically generated.
Attribute_Label: IS12
Percent of each land use polygon covered by impervious surface for 2012
Attribute_Definition_Source: NJDEP
Range_Domain_Minimum: 0
Range_Domain_Maximum: 100
Attribute_Units_of_Measure: percent
Attribute_Measurement_Resolution: 5
Attribute_Label: GLOBALID
Attribute_Definition: Unique Identifier
Attribute_Definition_Source: ESRI
Unrepresentable_Domain: Unique Value
Attribute_Label: SHAPE_Length
Attribute_Definition: Length of feature in internal units.
Attribute_Definition_Source: ESRI
Unrepresentable_Domain: Positive real numbers that are automatically generated.
Attribute_Label: SHAPE_Area
Attribute_Definition: Area of feature in internal units squared.
Attribute_Definition_Source: ESRI
Unrepresentable_Domain: Positive real numbers that are automatically generated.
The attributes in this data set describe land use/land cover categories for Percent impervious surface for each polygon from 2012.
Entity_and_Attribute_Detail_Citation: none

Contact_Organization: NJDEP/DOIT/Bureau of GIS
Contact_Person: GIS Help Desk
Address_Type: mailing and physical address
Address: 401 East State Street, PO Box 420
City: Trenton
State_or_Province: NJ
Postal_Code: 08625
Contact_Voice_Telephone: (609) 777-0672
Contact_Facsimile_Telephone: (609) 292-7900
Resource_Description: Downloadable Data
This organization provides the geographic data "as is". This organization makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. Also, this organization makes no warranty either expressed or implied, regarding the condition of the product or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these files have been processed successfully on computers at this organization, no warranty is made by this organization regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty. See also "Use Constraints" for additional distribution and/or data use requirements.
DEP distributes ESRI .SHP and/or GDB. Some data may be NJ GeoWeb "display only" layers.
Format_Version_Number: latest version
File_Decompression_Technique: WinZip
Offline_Media: None
Recording_Format: None
Fees: None
All available NJDEP public GIS data can be downloaded for free. Some data shown in the NJGeoWeb application may not yet be available for download due to various data or distribution issues. Please email with any data distribution questions.
The NJDEP may distribute GIS data in a variety of formats, such as the ESRI shapefile and/or various versions of the file geodatabase format. The data also may be available for viewing on various profiles of the NJ GeoWeb online mapping application.
Note: Some older NJDEP data may not contain .prj files due to distribution procedures at that time. If download does not contain a .prj, please download from:
Please rename .prj to the name of the downloadable filename. (for example: If Head of Tides filename is HOT.shp, please rename .prj to HOT.prj). This allows ESRI software to recognize the projection information.

Metadata_Date: 20150217
Contact_Person: Craig Coutros
Contact_Organization: NJDEP/DOIT/BGIS
Contact_Position: GIS Specialist
Address_Type: mailing and physical address
Address: 401 East State Street, Box 420
City: Trenton
State_or_Province: New Jersey
Postal_Code: 08625
Contact_Voice_Telephone: 609-677-0672
Contact_Facsimile_Telephone: 609-292-7900
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time

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