Description: US ZIP codes are a type of postal code used within the United States to help the United States Postal Service (USPS) route mail more efficiently. Some still refer to ZIP codes as US postal codes. The term ZIP stands for Zone Improvement Plan. Zip Codes are maintained within the Administration Feature and is dissolved out weekly.Administration is a polygon feature consisting of the smallest statistical areas bounded by visible features such as roads, streams, railroad tracks, and mountain ridges, as well as by nonvisible boundaries such as jurisdictional limits, school district, public safety boundaries, voting precincts, and census blocks. This methodology allows for single stream editing to move coincidental boundaries across many aggregate datasets simultaneously. Administration is maintained though an ArcGIS topology class in conjunction with County Parcels and Zoning. The topology prevents self-intersection and gaps, while ensuring complete coverage amongst the participating features.
Description: Jurisdictions is a polygon feature representing Roanoke County’s official version of the County boundary, as well as the boundary for the Town of Vinton. Roanoke County originally created this feature from County records at the County Courthouse in Salem, Va. The other jurisdiction boundaries within the feature were originally created from each jurisdictions records. Roanoke County has endeavored to reconcile its boundary with that of the surrounding localities through cooperative agreements such as the Public Safety Answering Point (PSAP) inter-jurisdictional program, Boundary and Annexation Survey (BAS) - U.S. Census Bureau, and parcel swaps though Board of Supervisor Action. Jurisdiction are maintained within the Administration Feature and is dissolved out weekly.Administration is a polygon feature consisting of the smallest statistical areas bounded by visible features such as roads, streams, railroad tracks, and mountain ridges, as well as by nonvisible boundaries such as jurisdictional limits, school district, public safety boundaries, voting precincts, and census blocks. This methodology allows for single stream editing to move coincidental boundaries across many aggregate datasets simultaneously. Administration is maintained though an ArcGIS topology class in conjunction with County Parcels and Zoning. The topology prevents self-intersection and gaps, while ensuring complete coverage amongst the participating features.
Description: Hamlets are satellite communities loosely based off of the USGS Named Places point feature. They are not an official administrative boundary, such as Magistraterial Districts, Voting Precincts, or Zip Code boundaries, but rather a grouping of like cultural and geographic specificity. Hamlets are maintained within the Administration Feature and is dissolved out weekly.Administration is a polygon feature consisting of the smallest statistical areas bounded by visible features such as roads, streams, railroad tracks, and mountain ridges, as well as by nonvisible boundaries such as jurisdictional limits, school district, public safety boundaries, voting precincts, and census blocks. This methodology allows for single stream editing to move coincidental boundaries across many aggregate datasets simultaneously. Administration is maintained though an ArcGIS topology class in conjunction with County Parcels and Zoning. The topology prevents self-intersection and gaps, while ensuring complete coverage amongst the participating features.
Description: Subdivision Lots are based off of the legal description recorded with the Commissioner of the Revenue. Subdivision are enumerated in the lot-block-section system (plat system), which refers to specific parcels of land identified by a lot number or letter within a block, or subdivision plat, in which the lot is located.Subdivision Lots are maintained within the Parcels Feature and is dissolved out weeklyThe Parcels feature is the geographic representation of cadastre records within the County as recorded in deeds and plats. The current parcels set is based off of the 1979 double circle maps by Wingate Appraisal & Mapping and digitized in the early 1990s. The data is continuously updated, as new land records become available. New parcels are added in a “best fit” methodology giving preference to the most current source. This feature is co-managed in AutoCAD and ArcMap. In Arc this polygon feature is part of an Editing topology along with our Zoning feature and our Administration feature. This prevents self-intersection and gaps, while ensuring complete coverage amongst the participating features.
Description: Appraiser Zones are a group of complementary land uses. Sometimes referred to as neighborhoods, these areas cluster parcels and their improvements by similar age, value, use, and economic potential. Appraiser Zones often follow subdivision boundaries, but may be split on block, section, or phase. These zones are maintained by Roanoke County Real Estate Valuation Dept. through AssessPro.
Description: The data set was developed by the Virginia Division of Geology and Mineral Resources to depict areas of karst as defined by the presence of sinkholes. Sinkholes were identified from low-altitude stereoscopic aerial photo pairs and traced onto 1:24:000 paper topographic maps, from which they were table-digitized. This is the same data depicted at 1:250,000 scale in Division of Geology Mineral Resources Publications 44, 83, and 167. Field checking has revealed that many more sinkholes are present than are depicted in this dataset. Therefore, these data should serve as a general guide to areas of karst-related sinkhole development, and not as a true indication of the presence or absence of sinkholes at a particular location.
Service Item Id: a7e06214132d422a8256901bdb7768c9
Copyright Text: Virginia Division of Geology and Mineral Resources
Department of Mines, Minerals and Energy
Hubbard, D. A., Jr., 1983, Selected Karst Features of the Northern Valley and Ridge Province, Virginia: Virginia Division of Mineral Resources Publication 44, 1:250,000-scale map.
Hubbard, D. A., Jr., 1988, Selected Karst Features of the Central Valley and Ridge Province, Virginia: Virginia Division of Mineral Resources Publication 83, 1:250,000-scale map.
Hubbard, D. A., Jr., 2001, Selected Karst Features of the Southern Valley and Ridge Province, Virginia: Virginia Division of Mineral Resources Publication 167, 1:250,000-scale map.
Description: The computed elevation to which floodwater is anticipated to rise during the base flood. Base Flood Elevations (BFEs) are shown on Flood Insurance Rate Maps (FIRMs) and on the flood profiles. The BFE is the regulatory requirement for the elevation or floodproofing of structures
Service Item Id: a7e06214132d422a8256901bdb7768c9
Copyright Text: Roanoke County, FEMA (Federal Emergency Management Agency)
Description: Polygon feature used to keep track of all known water bodies in the area. This includes Spring Hollow reservoir, Carvins Cove, Roanoke River, ponds, and other water bodies.
Description: This polygon feature was obtained from the United States Department of Agriculture. It is a polygon feature that inventories existing soil types.
Service Item Id: a7e06214132d422a8256901bdb7768c9
Copyright Text: United States Department of Agriculture, GIS Services Staff, Roanoke County Communitt Development Staff.