The wetland-drainage-unit layer was created as part of the New Jersey Pinelands Commission ecological-integrity assessment (Zampella et al. 2008). Drainage units were created using NJDEP (1996) stream data, a digital-elevation model (NJDEP 2002), and Arc Hydro (ESRI 2007). The term drainage unit refers to a section of a watershed. Drainage units were split along streams to create wetland-drainage units. Additional wetland-drainage units were delineated for the upper limit of mapped streams. This shapefile contains the wetland-drainage units for the Pinelands Area. ESRI. 2007. Arc Hydro for ArcGIS 9 Version 1.2 Beta. Environmental Systems Research Institute, Redlands, California, USA. NJDEP. 1996. New Jersey geographic information system CD-ROM, Series 1, Volumes 1-4. New Jersey Department of Environmental Protection, Office of Information Resource Management, Bureau of Geographic Information Systems, Trenton, New Jersey, USA. NJDEP. 2002. NJDEP 10-meter digital elevation grid, watershed management areas 13-20. New Jersey Department of Environmental Protection, Office of Information Resource Management, Bureau of Geographic Information Systems, Trenton, New Jersey, USA. Zampella, R. A., N. A. Procopio, M. U. Du Brul, J. F. Bunnell. 2008. An ecological-integrity assessment of the New Jersey Pinelands: A comprehensive assessment of the landscape and aquatic and wetland systems of the region. Pinelands Commission. New Lisbon, New Jersey, USA.
The wetland-drainage unit layer was used for the development of the wetland-drainage-unit integrity raster file which attributes the percentage of habitat, based on 2002 NJDEP land-use/land-cover data (NJDEP 2007) and as defined in Zampella et al. (2008), in each wetland-drainage unit to each cell in the associated unit. NJDEP. 2007. NJDEP land use/land cover update, watershed management areas 13-20. New Jersey Department of Environmental Protection, Office of Information Resource Management, Bureau of Geographic Information Systems, Trenton, New Jersey, USA. Zampella, R. A., N. A. Procopio, M. U. Du Brul, J. F. Bunnell. 2008. An ecological-integrity assessment of the New Jersey Pinelands: A comprehensive assessment of the landscape and aquatic and wetland systems of the region. Pinelands Commission. New Lisbon, New Jersey, USA.
April 2008
New Jersey Pinelands Commission (NJPC) Data Distribution Agreement Users 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, NJPC 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. NJPC assumes no responsibility to maintain them in any manner or form. Terms of Agreement 1. Digital data received from the NJPC 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 this metadata file. Any reproduction or manipulation of the above data must ensure that the coordinate reference system remains intact. 3. Digital data received from the NJPC may not be reproduced or redistributed for use by anyone without first obtaining written permission from the NJPC. 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 NJPC digital data will credit the NJPC'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 Pinelands Commission Geographic Information System digital data, but this secondary product has not been verified by NJPC and is not state-authorized." 5. Users shall require any independent contractor, hired to undertake work that will utilize digital data obtained from the NJPC, to agree not to use, reproduce, or redistribute NJPC GIS data for any purpose other than the specified contractual work. All copies of NJPC 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.
Drainage units were created using NJDEP (1996) stream data, a digital-elevation model (NJDEP 2002), and the Batch Subwatershed tool in Arc Hydro (ESRI 2007). Arc Hydro is a water resources tool designed to work within ArcGIS (ESRI 1999-2006). Points, referred to as pour points, were placed immediately above the confluence of streams or stream segments and the DEM was used to delineate the total area contributing stream flow to each pour point. To reduce variations in scale, streams or segments of streams that were two or more times as long as the median length of all first-order Pinelands streams were divided until they were less than twice the length of the median value. The total upstream area draining to a pour point represents the watershed. The term drainage unit refers to the portion of the watershed between pour points. Drainage units were split along streams to create wetland-drainage units. Additional wetland-drainage units were delineated for the upper limit of mapped streams. The following processing steps were completed: Convert the drainage-units to polyline (Polygon to Line tool). Merge the drainage-unit lines and the stream lines together (Merge tool). Convert the merged line layer to polyline (Feature to Line tool). Convert polyline layer to polygon (Feature to Polygon). Use GeoWizards extension in ArcGIS to create "Label Points" from the drainage-unit layer. Use Spatial Join to add the name of the associated drainage-unit to the points produced in the previous step. Use Spatial Join to add the name of the drainage-unit (from the previous step) to the split basins. Assign unique names: The attributes have the same drainage-unit name for each side of the split (wetland) drainage unit. Sites were ordered and the suffix _a or _b was added to the drainage-unit names. In drainage-units where lakes or cranberry bogs created more than two units within the same drainage-unit, the naming convention continued as needed. Post processing of this layer included the following steps: The resulting layer included a large number of slivers (small polygons) created from the alignment of the stream line confluences and the drainage-units. Additionally, many single pixel (10m x 10m) polygons remained with the name of the associated watershed. These polygons are a result of the Arc Hydro processing step where the raster is vectorized. Use the eliminate tool (ArcInfo only) to clean small slivers and non-contiguous polygons (single pixels) throughout the layer based on polygon size. Slivers/polygons less than 100 square meters were joined with the neighboring polygon with the greatest shared border. In a few cases this approach did not work because the wetland-drainage unit was smaller than 100 square meters. Those polygons were not combined. Polygons in wetland-drainage units where the eliminate process could not be used were manually joined ESRI. 1999-2006. ArcGIS 9.2. Environmental Systems Research Institute, Redlands, California, USA. ESRI. 2007. Arc Hydro for ArcGIS 9 Version 1.2 Beta. Environmental Systems Research Institute, Redlands, California, USA. NJDEP. 1996. New Jersey geographic information system CD-ROM, Series 1, Volumes 1-4. New Jersey Department of Environmental Protection, Office of Information Resource Management, Bureau of Geographic Information Systems, Trenton, New Jersey, USA. NJDEP. 2002. NJDEP 10-meter digital elevation grid, watershed management areas 13-20. New Jersey Department of Environmental Protection, Office of Information Resource Management, Bureau of Geographic Information Systems, Trenton, New Jersey, USA.
Feature geometry.
ESRI
Unique value assigned by Arc Hydro during file generation.
Unique value corresponding to individual stream reaches.
15 Springfield Rd.
15 Springfield Road