,

,More Metadata,This GIS layer contains the geographical boundaries of the 2010 census tracts for Loudoun County, Virginia. The 2010 Census tract boundaries are used for Census Bureau statistical data tabulation purposes, including the 2010 Decennial Census and American Community Surveys.,Census tracts are part of the sub-county census geography hierarchy of tracts, block groups, and blocks. The three census geographies nest to each other, forming a hierarchy of census tract, followed by block groups, and then blocks, with blocks being the smallest. A census tract consists of one or more census block groups and is a cluster of census blocks within the same census tract. Tracts are uniquely identified within a County by a six digit number. The last two digits will be zeros unless earlier divisions of the census tract occurred as a result of population growth.,Loudoun County's tracts were delineated by Loudoun County Government during the Census Bureau's Participant Statistical Areas Program for the 2010 Census. The 2010 Census tract layer has been modified from the Census Bureau's Tiger line file. Users should be aware that the Census's Tiger line data is devised from a mix of national and local GIS data sets. When the Tiger line data is overlaid with Loudoun County Government's detailed GIS layers it can be determined that the Census Bureau's Tiger line boundaries in some cases are slightly off from the actual location of the physical features, natural features, and governmental units such as town boundaries that they are designated to follow. The 2010 Loudoun census tract layer was generated by Loudoun County so that the tract boundaries would overlay with the features in Loudoun County's GIS data sets that the boundary are designated to follow.,

,Metadata,The Mountainside Development Overlay District is a zoning overlay district administered by the Department of Building and Development. Mountainside classifications are based upon the following criteria: critical elevation, debris flow (slippage) potential, groundwater recharge, soils, slope, and forest values. Critical elevation areas are determined from the County's digital topography, soil and slope values are based upon data, the County's soil layer, and forested areas are based upon the digital forest data. This original MDOD replaces the voided layer implemented in 2003 (see disclaimer above).,Purpose:,The Mountainside Development Overlay District is a zoning overlay district (see Section 4-1600 of the 1993 Loudoun County Zoning Ordinance) and regulates development on the mountainsides of the County. Mountainside data should be used for general planning purposes only and is not intended for use in delineating specific use or suitability of soils for a particular site. Areas prone to debris flow (slippage) may not be accurately delineated. The Department of Building and Development is responsible for final clearance and interpretation on zoning/building permits and land development applications for the Mountainside Development Overlay District.,

,More Metadata,This Water Well layer was created in March 2010 to provide an easily accessiable spatial database of water wells only. It also provides additional attribute information on Status, Depth, etc.,The original water well & pollution source layer was developed in 1988 by the County’s Environmental Health Department. Records were entered into a database from 40 years of historical paper files, which exhibited a wide range of completeness and accuracy. This was an on-going process until early 1996 at which time the layer was no longer maintained. In late 2000, the Department of Building and Development began a process of updating the layer by entering data from the permit files, which had accumulated since 1996.,

,More Metadata,This layer identifies the Route 28 Optional Overlay Districts in Eastern Loudoun County. The districts provide additional development options for the properties mapped as specified in Article 4 Division D of the Revised 1993 Zoning Ordinance.,Purpose:,This layer is used to depict the properties along the Route 28 Corridor that are mapped for the Rt. 28 Optional Overlay Districts. The Rt. 28 Optional Overlay Districts are intended to provide planned development and incentive zoning as tools to coordinate new development with the Route 28 Corridor Plans goals and objectives.,

,

,