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. The primary legal divisions of most states are termed counties. In Louisiana, these divisions are known as parishes. In Alaska, which has no counties, the equivalent entities are the organized boroughs, city and boroughs, municipalities, and for the unorganized area, census areas. The latter are delineated cooperatively for statistical purposes by the State of Alaska and the Census Bureau. In four states (Maryland, Missouri, Nevada, and Virginia), there are one or more incorporated places that are independent of any county organization and thus constitute primary divisions of their states. These incorporated places are known as independent cities and are treated as equivalent entities for purposes of data presentation. The District of Columbia and Guam have no primary divisions, and each area is considered an equivalent entity for purposes of data presentation. The Census Bureau treats the following entities as equivalents of counties for purposes of data presentation: Municipios in Puerto Rico, Districts and Islands in American Samoa, Municipalities in the Commonwealth of the Northern Mariana Islands, and Islands in the U.S. Virgin Islands. The entire area of the United States, Puerto Rico, and the Island Areas is covered by counties or equivalent entities. The boundaries for counties and equivalent entities are as of January 1, 2017, primarily as reported through the Census Bureau's Boundary and Annexation Survey (BAS).

Geologic map of the Gasburg 7.5-minute Quadrangle, Brunswick County, Virginia, and Warren, Northampton, and Halifax Counties, North Carolina. The base maps for this series were developed from U.S. Geological Survey topographic 7.5-minute quadrangle maps (1:24,000 scale). Contour interval is in feet. For more information on this resource or to download the map PDF, please see the links provided.

Tysons North Central web map that supports the web experience for the Tysons Tracker.Contact: Planning & Development, GIS CoordinatorData Accessibility: Publicly AvailableUpdate Frequency: YearlyLast Revision Date: September 2024Creation Date: March 2024

These data were created as part of the National Oceanic and Atmospheric Administration Office for Coastal Management's efforts to create an online mapping viewer called the Sea Level Rise and Coastal Flooding Impacts Viewer. It depicts potential sea level rise and its associated impacts on the nation's coastal areas. The purpose of the mapping viewer is to provide coastal managers and scientists with a preliminary look at sea level rise (slr) and coastal flooding impacts. The viewer is a screening-level tool that uses nationally consistent data sets and analyses. Data and maps provided can be used at several scales to help gauge trends and prioritize actions for different scenarios. The Sea Level Rise and Coastal Flooding Impacts Viewer may be accessed at: http://www.coast.noaa.gov/slr This metadata record describes the digital elevation model (DEM), which is a part of a series of DEMs produced for the National Oceanic and Atmospheric Administration Office for Coastal Management's Sea Level Rise and Coastal Flooding Impacts Viewer described above. This DEM includes the best available data known to exist at the time of DEM creation that met project specifications, for mainland Virginia, this includes portions of the following counties: Alexandria, Arlington, Charles City, Chesapeake, Essex, Fairfax, Falls Church, Franklin City, Fredericksburg City, Gloucester, Hampton, Isle of Wight, James City, King and Queen, King George, King William, Lancaster, Mathews, Middlesex, New Kent, Newport News, Norfolk, Northumberland, Poquoson City, Portsmouth, Prince George, Prince William, Richmond, Southampton, Stafford, Suffolk, Surry, Sussex, Virginia Beach, Westmoreland, Williamsburg, and York. This DEM also includes the District of Columbia. The DEM is derived from the following lidar: 1. New Kent, Charles City, Prince George Counties 2012 FEMA Middle Counties VA Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/Middle_Counties/Metadata/Project_Report/Dewberry_ProjectReport_MiddleCounties.pdf Additional coverage provided by the Virginia Base Map Program (VBMP). This data is a digital terrain model initially generated by the Center for Geospatial Technology (CGIT) for the Virginia Geographic Information Network (VGIN) using the mass points and break lines from 2002 VBMP aerial photography. 2. King William County 2011 FEMA King William County VA Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/KingWilliamCo/KingWilliam_Metadata/Dewberry_ProjectReport_KingWilliam.pdf Additional coverage provided by the Virginia Base Map Program (VBMP). This data is a digital terrain model initially generated by the Center for Geospatial Technology (CGIT) for the Virginia Geographic Information Network (VGIN) using the mass points and break lines from 2002 VBMP aerial photography. 3. Hampton and Portsmouth Cities 2011 FEMA Virginia Southern Cities Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/SouthernCities/SouthernCities_Metadata/Dewberry_ProjectReport_SouthernCities.pdf 4. Franklin City and Southampton County 2011 FEMA Virginia Counties South Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/VA_Counties_South/SouthernCo_Metadata/Dewberry_ProjectReport_Southampton.pdf 5. Fredericksburg City and Essex, King George, Prince William, Richmond, Stafford, Westmoreland Counties 2011 FEMA Virginia Counties North Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/VA_Counties_North/NorthernCo_Metadata/Dewberry_ProjectReport_NorthernCounties.pdf 6. Northumberland, Middlesex, Lancaster, King and Queen, Gloucester, Mathews, James City, Williamsburg, Surry, Isle of Wight, Suffolk Counties 2010/2011 USGS Eleven County Coastal VA Lidar This data may be downloaded from the William and Mary Center for Geospatial Analysis: http://www.wm.edu/as/cga/VALIDAR/ The project report for this data may be accessed at: http://gisfiles.wm.edu/files/lidar/a11county/Metadata/PROJECT_REPORT/Final%20Project%20Report%20for%20USGS%20Virginia%20LiDAR_01312011.pdf Additional coverage for Surry and King and Queen counties provided by the Virginia Base Map Program (VBMP). This data is a digital terrain model initially generated by the Center for Geospatial Technology (CGIT) for the Virginia Geographic Information Network (VGIN) using the mass points and break lines from 2002 VBMP aerial photography. 7. Alexandria, Arlington, and Falls Church Counties 2008 NGA Capital Region Lidar The lidar data is not publicly available, the data was provided by the State of Virginia as bare earth DEMs. 8. Fairfax County 2008 NGA Capital Region Lidar The lidar data is not publicly available, the data was provided by the State of Virginia as bare earth DEMs. 2012 FEMA Virginia Lidar This data may be downloaded from USGS EarthExplorer at: http://earthexplorer.usgs.gov/ 9. York, Poquoson City, Newport News, Norfolk, Chesapeake, Virginia Beach, and Sussex Counties Data provided by the Virginia Base Map Program (VBMP). This data is a digital terrain model initially generated by the Center for Geospatial Technology (CGIT) for the Virginia Geographic Information Network (VGIN) using the mass points and break lines from 2002 VBMP aerial photography. 2010 US Army Corps of Engineers (USACE) Lidar This data may be downloaded at: http://www.coast.noaa.gov/dataviewer/index.html?action=advsearch&qType=in&qFld=ID&qVal=1132 The metadata for this data may be accessed at: http://coast.noaa.gov/dataviewer/webfiles/metadata/usace2010_va_template.html 10.District of Columbia Washington, DC and Environs, 2008, 1/9 Arc second National Elevation Dataset (NED) This data may be downloaded at: http://viewer.nationalmap.gov/viewer/ Hydrographic breaklines were delineated from LiDAR intensity imagery generated from the LiDAR datasets. The DEM is hydro flattened such that water elevations are less than or equal to 0 meters. The DEM is referenced vertically to the North American Vertical Datum of 1988 (NAVD88) with vertical units of meters and horizontally to the North American Datum of 1983 (NAD83). The resolution of the DEM is approximately 10 meters.

The Commonwealth of Virginia grants certain powers to incorporated municipalities. There are seven towns in the County. Washington Dulles International Airport is also included due to its jurisdictional authority.

Purpose: Town boundaries can define the limits of zoning, and other police powers, and the provision of services by both the towns and the County. Jurisdictional authority is represented for each of the seven towns and Washington Dulles International Airport.

Supplemental Information: Data are stored in the corporate ArcSDE Geodatabase as a feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. The first town to be incorporated in Loudoun was Leesburg in 1757.

Maintenance and Update Frequency: As Needed

Town boundaries are updated within 1-2 weeks of the date of receipt of recorded documents associated with annexations. Recorded documents are generally received from the Department of Financial Services within 4-6 weeks of the date of recordation. Town boundaries are checked for coincidence with parcel boundaries approximately once every six months.

Completeness Report: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data.

Data Owner:

Office of Mapping and Geographic Information

Geologic map of the South Hill SE 7.5-minute Quadrangle, Mecklenburg and Brunswick Counties, Virginia, and Warren County, North Carolina. The base maps for this series were developed from U.S. Geological Survey topographic 7.5-minute quadrangle maps (1:24,000 scale). Contour interval is in feet. For more information on this resource or to download the map PDF, please see the links provided.

More Metadata

Data updated daily.

Street centerline was originally developed from the road features on the County's 1:2400 base map. Both address range and a link to street names are included as data attributes. The current data is collected from recorded plats in DXF format or is digitized from plats. The data covers the entire County as well as the incorporated Towns. Purpose: The street centerline coverage was originally developed to support addressing. Fire & Rescue Services and the Sheriff's Office use the address range information for Emergency 911 dispatching; it is also used to update U.S. Census Bureau Tiger data in support of the decennial census. Supplemental Information: Centerline data are maintained from plats and site plans prepared by engineering and surveying firms. Although street centerline is the most current of the County's street data, deviation in construction after plat submittal and recordation may cause centerline to differ from similar County layer, road casing. Centerline contains the most current data; road casing is spatially more accurate because it is updated photogrammetrically. These data are not intended to be used for local surveys or at a scale larger than 1:2400. Data are stored in the corporate ArcSDE Geodatabase as a feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. Maintenance and Update Frequency: Data is updated on a daily basis. Completeness Report: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data. Data Owner: Office of Mapping and Geographic Information

description:

The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to earth's surface using the North American Datum of 1983 (NAD83) HARN Virginia State Plane south zone (FIPSZONE 4502) coordinate system and the Lambert Conformal Conic projection. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

A 1:24,000 scale map of the geology of the South Hill quadrangle

The Virginia Scenic Rivers Program was enabled by the Virginia Scenic Rivers Act of 1970. Within Loudoun County are two Virginia-designated scenic rivers - Catoctin Creek from Waterford to the confluence of the Potomac, and Goose Creek from the confluence of the north and south prongs near Linden to the confluence of the Potomac. These creeks are represented in the Loudoun County GIS using the base map drainage data, which is collected via a planimetric update process from aerial photography and processed for a cartographic representation at 1:2400 Scale, and are mapped to National Map Accuracy Standards (NMAS). As the designation is to the main trunk of each stream, tributaries were removed and the centerlines were dissolved by name.Updated - 2016Additional Information:Scenic Rivers Act - Catoctin Creek State Scenic RiverScenic Rivers Act - Goose Creek State Scenic RiverIf you would like more information or would like to get involved please contact the following:Catoctin Creek Scenic River Advisory CommitteeGoose Creek Scenic River Advisory Committee

THIS MAP SHOWS THE FOLLOWING:Designated Highways on the state-maintained system. The National Network and Virginia Qualifying Highways include all interstates and certain other highways respectively, with one road-mile of access permissible off these routes to access terminals, fuel, food, rest, and repairs (except in cities and towns, or in Henrico and Arlington Counties where permission is required from those localities). The Virginia Access portion includes certain other primary and secondary routes where no access is allowed off the system. LIMITATIONS & EXCLUSIONS REGARDING TRUCK ROUTES & RESTRICTIONS PROVIDED ON THIS MAP1. The information presented applies only to the highway systems maintained by the Virginia Department of Transportation (VDOT). Additional STAA access or restrictions may apply in incorporated cities and towns, and on secondary roads (numbered 600 or higher) in Henrico and Arlington Counties.2. Access to, or restrictions on, the indicated routes for the specified vehicles is applicable unless other restrictions or limitations apply due to weight, height, or width; incidents or construction; or as otherwise indicated by signs on the highway.3. To the best of our knowledge the information provided is updated on a weekly basis or as received from Districts. It is the responsibility of the highway user to ensure their information is current and correct.A permit for additional access off the state maintained system may be requested by contacting the Department of Motor Vehicles at (804) 497-7135. For additional access in cities and towns and in Henrico and Arlington Counties contact officials in those localities.

The purpose of this data set is to provide a geographic representation of the location of each state mile marker sign in the Commonwealth, and is to be used in a number of other products and projects. The locations of state mile marker signs on interstates and primary routes are important sources for various traffic studies as well as information for travelers. This GIS layer displays the locations and corresponding information of state mile marker signs. The signs may have been placed close but not exactly at the mile point due to geographic restrictions.Attribute NameContentsFIDInternal Feature NumberShapeFeature GeometryHTRISDEFHTRIS Definition in the Roadway InventoryROADSIDELocations of Mile Marker Posts (Right, Left, or Median)LATITUDEGPS latitude for each Mile Marker point in decimal degreesLONGITUDEGPS longitude for each Mile Marker point in decimal degreesSIGNSTYLE0: Small & Non-MUTCD Compliant, 1: MUTCD Standard (D10-1, D10-2 or D10-3), 2: MUTCD Enhanced (D10-4 or D10-5)SIGNVALUENumeric Value from the Sign Text except NULL, -1, and -2 valuesSIGNTEXTFull Sign TextM_JURISDICMaintenance Jurisdiction Code

More Metadata Data updated daily.Address points mark the location of each addressable structure and its access point. The access point is the place where a driveway intersects the road. The building point is where the structure is located. An addressable structure is one where people live, work, or gather. A 1 to 5-digit number designates an address. Purpose: The access point is used to assign an address to the structure. Addresses are also assigned to assist in the provision of emergency services; they can be queried at all Fire and Rescue stations and by E-911 dispatchers. Supplemental Information: Data are stored in the corporate ArcSDE Geodatabase as a feature class. The coordinate system is Virginia State Plane (North), Zone 4501, datum NAD83 HARN. Maintenance and Update Frequency: Daily Completeness Report: Features may have been eliminated or generalized due to scale and intended use. To assist Loudoun County, Virginia in the maintenance of the data, please provide any information concerning discovered errors, omissions, or other discrepancies found in the data. Data Owner: Office of Mapping and Geographic Information

description: The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the North American Datum of 1983 (NAD 83) HARN Virginia State Plane south zone (FIPSZONE 4502) coordinate system and the Lambert Conformal Conic projection. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.; abstract: The Digital Flood Insurance Rate Map (DFIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual- chance flood event, and areas of minimal flood risk. The DFIRM Database is derived from Flood Insurance Studies (FISs), previously published Flood Insurance Rate Maps (FIRMs), flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). The file is georeferenced to the earth's surface using the North American Datum of 1983 (NAD 83) HARN Virginia State Plane south zone (FIPSZONE 4502) coordinate system and the Lambert Conformal Conic projection. The specifications for the horizontal control of DFIRM data files are consistent with those required for mapping at a scale of 1:12,000.

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