WebLogis, Loudoun County's Online Mapping System. Provides access to the County’s Enterprise Geographic Information System data layers.

In September 2020, the Loudoun County Board of Supervisors directed staff to document telecommunication projects completed, in-progress, and future projects, using the 2014 Wireless GAP Analysis and the Segra Dark Fiber Area Network. Staff mapped the data identified by the Board, as well as other information related to telecommunication projects. This information was then used to identify select unserved or underserved geographic areas of the county.The companion interactive map allows the user to turn on or off all layers used in the project.

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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

More MetadataThis 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 This was an on-going process until early 1996 at which time the layer was no longer maintained.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.

Geospatial data about Loudoun County, Virginia Topography (4ft). Export to CAD, GIS, PDF, CSV and access via API.

More MetadataPlanar Index of Loudoun County is used primarily for locator reference and establishes the first 3 digits in the MCPI number for parcels. This information can also be known as Map, Sheet, or Tile number in other data sets.The index coverage contains approximately 690 polygons which coincide with Loudoun County's GIS library tile system. Digital Data orders and associated maps are available to the extent of any individual tile as well as county wide. Each tile is designated with a unique ID number that is used in GIS data orders to identify the area of interest.

DO NOT DELETE OR MODIFY THIS ITEM. This item is managed by the Open Data application. To make changes to this site, please visit https://opendata.arcgis.com/admin/

This point feature class contains all the identified Loudoun County Park and Ride vehicle lots according to the Loudoun County Office of Transportation and Capital Infrastructure. Update Frequency: As needed

Sidewalk and Trail Centerlines are collected as a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. Typical features captured in the Sidewalk and Trail layer include are sidewalks, trails, shared use paths, golf cart paths, crosswalks and the W&OD trail features as seen from above and are mapped to National Map Accuracy Standards (NMAS). Supplemental data, including connectors and crosswalks, are captured from visual inspection and digitization from the County's digital aerial imagery. Prior to 2020, Sidewalk and Trail Centerlines were a layer derived from the base map data layer Miscarc_line. SI_TYPE: 1 SIDEWALK 2 CONNECTOR3 CROSSWALK 4 TRAILS 5 FOOTBRIDGE 6 W&OD TRAIL (Washington & Old Dominion Railroad Regional Park) 7 GOLF CART PATHS SI_WIDTH: 2 less than 2 feet 4 2-4 feet 6 4-6 feet 8 6-8 feet 10 8 feet or greater 99 Undetermined SI_SURFACE: 1 CONCRETE 2 ASPHALT 3 BRICK *A "Shared Use Path" is generally represented as an "ASPHALT" "TRAIL", and can be queried from the TYPE and SURFACE fields.

Loudoun County, Virginia Boundary

Loudoun County annually obtains leaf-off, aerial imagery in the spring. Since 2004, the County has utilized this imagery to support the development of an annual digital orthophoto base."Loudoun County - Latest" (LATEST_ORTHO) is the most recent year available.

Loudoun County annually obtains leaf-off, aerial imagery in the spring. Since 2004, the County has utilized this imagery to support the development of an annual digital orthophoto base. In 2021, the imagery was captured with a Vexcel Ultracam Eagle digital camera, in 4-band (R,G,B, and NIR) format. These files contain 1-foot ground-resolution, 8-bit, 4-band orthorectified aerial image map products in GeoTIFF version 6.0 file format. GeoTIFF files are uncompressed raster images complete with TFW coordinate information. The aerial imagery project encompasses the entire land area of the County of Loudoun, VA. Images were flown during leaf-off conditions and cover 5000' by 5000' and are tiled according to the VBMP 200-scale gridding schema (Virginia Geographic Information Network)."March 2021 Photography flown by the Sanborn Map Company, Colorado Springs, CO." "Digital Orthophotography compiled by Sanborn Map Company, Colorado Springs, CO"

Geospatial data about Loudoun County, Virginia Parcel Boundaries. Export to CAD, GIS, PDF, CSV and access via API.

Loudoun County annually obtains leaf-off, aerial imagery in the spring. Since 2004, the County has utilized this imagery to support the development of an annual digital orthophoto base. In 2023, the imagery was captured with a Vexcel Ultracam Eagle digital camera, in 4-band (R,G,B, and NIR) format. These files contain 1-foot ground-resolution, 8-bit, 4-band orthorectified aerial image map products in GeoTIFF version 6.0 file format. GeoTIFF files are uncompressed raster images complete with TFW coordinate information. The aerial imagery project encompasses the entire land area of the County of Loudoun, VA. Images were flown during leaf-off conditions and cover 5000' by 5000' and are tiled according to the VBMP 200-scale gridding schema (Virginia Geographic Information Network)."March 2023 Photography flown by The Sanborn Map Company, Inc. Colorado Springs, CO." "Digital Orthophotography compiled by Sanborn Map Company, Inc. Colorado Springs, CO"

Geospatial data about Loudoun County, Virginia Steep Slope. Export to CAD, GIS, PDF, CSV and access via API.

More MetadataThis layer depicts the 1 mile subdivsion control area around the Town of Hamilton and the Town of Middleburg, as established by Section 1241.03 of the Land Subdivision and Development Ordinance. The Town of Purcellville subdivision control area ceased to exist upon dissolution of the Purcellville Urban Growth Area Management Plan (PUGAMP) and the Town of Purcellville/County of Loudoun Annexation Agreement in 2013. The control area around the Town of Hamilton is based on the map prepared by the County of Loudoun entitled "Parcels within 1 mile of Hamilton" and the control area around the Town of Middleburg is based on the map prepared by the County of Loudoun entitled "Town of Middleburg One Mile Subdivision Control Limit".

The geology of Loudoun County, Virginia, was mapped in 1988 through 1991 under a cooperative agreement between the U.S. Geological Survey (USGS) and the Loudoun County Department of Environmental Resources.This geologic map was compiled in 1993 from a series of detailed published and unpublished field investigations at scales of 1:12,000 and 1:24,000. Some of these same datawere compiled as a digital geologic map at 1:100,000 scale (Burton and others, 1992a) and were the basis for a cost-benefit analysis of the societal value of geologic maps (Bernknopf and others, 1993).The data was later revised and published by USGS in the Open File Report, MAP OF-99-150, GEOLOGIC MAP OF LOUDOUN COUNTY, VIRGINIA By Scott Southworth, W.C. Burton, J.S. Schindler, and A.J. Froelich1 with contributions on the geology of the Piedmont province by A.A. Drake, Jr., and R.E. Weems and an aeromagnetic survey by D.L. Daniels, W.F. Hanna, and R.E. Bracken.Data current as of April 2018

Loudoun County Parcel X,Y coordinates table. Available in Latitude and Longitude decimal degrees and Virginia State Plane North.