Chatham County, NC Zip Code polygons as maintained by the Chatham County E-911 Addressing Specialist. The original dataset comes from the Census Bureau which releases the GIS data to the public in the form of TIGER/Line Shapefiles. The TIGER/Line shapefiles and related database files (.dbf) are an extract of selected geographic and cartographic information from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic Encoding and Referencing (MAF/TIGER) Database (MTDB). The MTDB represents a seamless national file with no overlaps or gaps between parts, however, each TIGER/Line shapefile is designed to stand alone as an independent data set, or they can be combined to cover the entire nation. ZIP Code Tabulation Areas (ZCTAs) are approximate area representations of U.S. Postal Service (USPS) ZIP Code service areas that the Census Bureau creates to present statistical data for each decennial census. The Census Bureau delineates ZCTA boundaries for the United States, Puerto Rico, American Samoa, Guam, the Commonwealth of the Northern Mariana Islands, and the U.S. Virgin Islands once each decade following the decennial census. Data users should not use ZCTAs to identify the official USPS ZIP Code for mail delivery. The USPS makes periodic changes to ZIP Codes to support more efficient mail delivery. The Census Bureau uses tabulation blocks as the basis for defining each ZCTA. Tabulation blocks are assigned to a ZCTA based on the most frequently occurring ZIP Code for the addresses contained within that block. The most frequently occurring ZIP Code also becomes the five-digit numeric code of the ZCTA. These codes may contain leading zeros. Blocks that do not contain addresses but are surrounded by a single ZCTA (enclaves) are assigned to the surrounding ZCTA. Because the Census Bureau only uses the most frequently occurring ZIP Code to assign blocks, a ZCTA may not exist for every USPS ZIP Code. Some ZIP Codes may not have a matching ZCTA because too few addresses were associated with the specific ZIP Code or the ZIP Code was not the most frequently occurring ZIP Code within any of the blocks where it exists. The ZCTA boundaries in this release are those delineated following the 2010 Census.Chatham GIS SOP: "MAPSERV-14"

Polygon features representing the fire tax districts in Chatham County, NC.Chatham GIS SOP: "MAPSERV-25"

Polygons features derived from the Chatham County parcel polygon layer that identify the current zoning classifications for said parcels in Chatham County, NC. This feature class also contains boundaries for the Town of Siler City & Town of Pittsboro ETJ's as well as polygons identifying unzoned areas in Chatham County.

The feature class is maintained by the Chatham County Planning Department.Chatham GIS SOP: "MAPSERV-82"

Annotation feature class that provides labels for property boundary lengths and acreage of parcels in Chatham County, NC. This service also provides annotation for easements in the Chatham County parlines feature class.

The annotation feature class is maintained by the Chatham County GIS & Tax departments and is updated on a daily basis.Chatham GIS SOP: "MAPSERV-163"

This feature class contains line features representing two foot changes in elevation throughout Chatham County, NC. The contour data can be used in various applications throughout Chatham Counties' different departments and also serves as important layer in Chatham Counties' topographic basemap utilized in various web mapping applications.Chatham GIS SOP: "MAPSERV-57"

This feature class contains line features representing two-foot changes in elevation throughout Chatham County, NC. It is sourced from Quality Level 2 lidar data provided by the North Carolina Department of Public Safety Floodplain Mapping Program. LASD datasets were created referencing the tiled lidar data. Subsets were built using classified ground and water returns. Raster Digital Elevation Models (DEMs) were built by binning the points and averaging elevation values within 15 m x 15 m cells. The resulting DEMs were mosaicked to a contiguous ground elevation raster covering the entire county. Areas without ground point coverage that are covered by water bodies were patched by using DEMs derived from binned water elevation values. Contour lines were derived from the contiguous, patched DEM at various contour intervals.

Line features that represent the boundaries of parcels within Chatham County, NC. The parcel lines feature class is maintained by the Chatham County GIS & Tax departments and is updated on a daily basis.Chatham GIS SOP: "MAPSERV-31"

Polygon features depicting the boundaries of recorded subdivisions within Chatham County, NC.

The data is created and maintained by the Chatham County GIS Department as part of the cadastral feature dataset.Chatham GIS SOP: "MAPSERV-38"

Point features representing points of interest throughout Chatham County, NC that may not be an incorporated municipality, but are significant & identifiable landmarks on a map. This feature class is primarily utilized for county-wide map layouts to give points of reference to readers of said maps.

The data is maintained by the Chatham County GIS department and the last date of update is unknown.Chatham GIS SOP: "MAPSERV-90"

Road segments representing centerlines of all roadways or carriageways in Chatham County, NC. This representation of the road centerlines support address geocoding and mapping. It also serves as a source for public works and other agencies that are responsible for the active management of the road network.

This feature class is maintained by the E-911 Addressing Specialist for Chatham County within the addressing dataset of the ChathamGIS enterprise SDE database. The geometry of this feature class is imported and fields matched to the RoadCenterline feature class located in the reference dataset of the ChathamGIS SQL database to adhere to the LGIM data structure nightly through a scripting process.Chatham GIS SOP: "MAPSERV-4"

Line features representing railroad tracks in Chatham County, NC. The feature geometry was downloaded from the NCDOT website in July 2015 and imported into Chatham Counties' enterprise GIS database utilizing Esri's local government information data schema.Chatham GIS SOP: "MAPSERV-110"

River and Stream lines that represent flowlines and cartographic features such as stream centerlines and river banks in Chatham County, NC. This feature class contains named streams, rivers, and creeks located within and along the Chatham County boundary. These named waterline features serve as an integral part of the basemap layers utilized in Chatham Counties' enterprise GIS web applications.Chatham GIS SOP: "MAPSERV-114"

Points that represent significant facility locations in Chatham County, NC. Examples include schools, government facilities, stadiums, casinos, and fire stations. In some cases, there may be multiple FacilitySitePoints for a single FacilitySite polygon. Additional information about each Facility can be organized in to seperate tables and related to these locations using the FacilityID key. The feature classification and type schema for the facility sites grew out of work with the Department of Homeland Security's HSIP Program and has evolved to support a diverse set of facilities inventoried for a variety of uses by a local government. The facility site points feature class is utilized in the development and maintenance of the Chatham County, NC basemaps.Chatham GIS SOP: "MAPSERV-93"

Polygon features representing wetland areas in Chatham County, NC as defined by the National Wetland Inventory.

This dataset was downloaded in July 2015 from the U.S. Fish and Wildlife Service website (http://www.fws.gov/wetlands/data/State-Downloads.html) and clipped out of the NC state wetland feature class using the Chatham County boundary. The clipped feature class was imported into the Chatham County enterprise GIS database for visual and analytical purposes in Chatham County mapping operations. The dataset is maintained by the Chatham County GIS department utilizing the source data from the U.S. Fish and Wildlife Service on an as needed basis.

This data set represents the extent, approximate location and type of wetlands and deepwater habitats in the United States and its Territories. These data delineate the areal extent of wetlands and surface waters as defined by Cowardin et al. (1979). Certain wetland habitats are excluded from the National mapping program because of the limitations of aerial imagery as the primary data source used to detect wetlands. These habitats include seagrasses or submerged aquatic vegetation that are found in the intertidal and subtidal zones of estuaries and near shore coastal waters. Some deepwater reef communities (coral or tuberficid worm reefs) have also been excluded from the inventory. These habitats, because of their depth, go undetected by aerial imagery. By policy, the Service also excludes certain types of "farmed wetlands" as may be defined by the Food Security Act or that do not coincide with the Cowardin et al. definition. Contact the Service's Regional Wetland Coordinator for additional information on what types of farmed wetlands are included on wetland maps. This dataset should be used in conjunction with the Wetlands Project Metadata layer, which contains project specific wetlands mapping procedures and information on dates, scales and emulsion of imagery used to map the wetlands within specific project boundaries.Chatham GIS SOP: "MAPSERV-105"

This feature class contain mile marker points for US Highways located within Chatham County, NC. It also contains mile marker points for Jordan Lake. These point features are utilized within emergency response mapping operations and the data is maintained by the Chatham County E-911 Addressing Specialist.Chatham GIS SOP: "MAPSERV-12"

Polygon features delineating law response zones in Chatham County, NC.

Data is maintained by the Chatham County E-911 addressing specialist for use in emergency operations.Chatham GIS SOP: "MAPSERV-11"

Polygon features representing waterbodies in Chatham County, NC. This feature class contains all waterbody polygons in Chatham County, NC. A smaller, more refined dataset of just the major waterbodies in Chatham County exists in the reference dataset within the Chatham County enterprise GIS database.Chatham GIS SOP: "MAPSERV-100"

Polygon features delineating Zoning classifications for the Town of Siler City including the Siler City ETJ. Data is maintained by the Chatham County GIS department via updates sent from Town of Siler City Planning Department on an as needed basis.

Last Updated June 2015.Chatham GIS SOP: "MAPSERV-85"

Point features representing known tower locations in Chatham County, NC. The tower feature class identifies the tower type as either communication, water, or lookout tower. There is a separate attribute field that defines if the tower has cellular equipment on it.

The feature class was created in July of 2015 by the Chatham County GIS department and said department will maintain it moving forward on an as needed basis.Chatham GIS SOP: "MAPSERV-78"

Line features representing existing and proposed fiber lines (buried & aerial) owned by Chatham County MIS in Chatham County, NC. These fiber lines are utilized for the NC811 notification system that Chatham County MIS participates in.

The buried fiber line features are utilized to create a buffer polygon that is imported into NC811's notification system serving as the basis for all Chatham County MIS notifications. The original data was collected by Performance Cabling using industry standard GPS collection methods. The data was delivered to Chatham County MIS / GIS in May of 2015. The data was imported into the ChathamGIS SQL database in August 2015 and stored in the "infrastructure" dataset.

The ongoing data updates and maintenance will be conducted by Chatham County GIS in collaboration with Performance Cabling on an as needed basis.Chatham GIS SOP: "MAPSERV-74"