The DC Basemap provides a reference map for the District of Columbia projected in Web Mercator. Access the ArcGIS Rest endpoint. The basemap utilizes the most current planimetric and reference data available and represents the real world with foundation map layers derived from base data collection done in 2023.The service is provided by the Office of the Chief Technology Officer.

Property and parcel data is a critical layer to any city or statewide data holdings. In our city's complex urban environment, this includes numerous geographies that identify federal government lands, reservations, District lands, personal property and so much more. Use this application to query and identify boundaries including: Property Lots, Lot Dimensions, Condo Data, Tax Assessments, Zoning, Squares.

The DC Office of the Chief Financial Officer (OCFO), Office of Tax and Revenue (OTR), Real Property Tax Administration (RPTA) values all real property in the District of Columbia. This public interactive Real Property Assessment map application accompanies the OCFO MyTax DC and OTR websites. Use this mapping application to search for and view all real property, assessment valuation data, assessment neighborhood areas and sub-areas, detailed assessment information, and many real property valuation reports by various political and administrative areas. View by other administrative areas such as DC Wards, ANCs, DC Squares, and by specific real property characteristics such as property type and/or sale date. If you have questions, comments, or suggestions regarding the Real Property Assessment Map, contact the Real Property Assessment Division GIS Program at (202) 442-6484 or maps.title@dc.gov.

Digital version of the National Park Service Map A, indicating Park Service properties and other government-owned land.

A generalized dataset of existing land use in the District of Columbia as existed during its most recent extract of the common ownership lots. This dataset is different from the Comprehensive Plan - Future Land Use, which shows land use as envisioned in the latest version of DC’s Comprehensive Plan. The primary land use categories used in this dataset are similar, but not identical. The Office of the Chief Technology Officer (OCTO) compared two datasets to create this generalized existing land use data. The data source identifying property use is the Property Use Code Lookup from the Office of Tax and Revenue (OTR). An index provided by the Office of Planning assigns each OTR property use code with a “primary land use” designation. Through an automated process, the common ownership lots were then joined with this index to create the Existing Land Use. Only properties with an assigned use code from OTR are categorized. Other properties without a use code were left as NULL. Many of these tend to be public lands such as national parks. Refer to https://opendata.dc.gov/pages/public-lands.This dataset has no legal status and is intended primarily as a resource and informational tool. The Office of the Chief Technology Officer anticipates replicating this work annually.

0.6 meter contours. This dataset contains locations and attributes of 0.6 meter interval topography data, created using bare earth points from the lidar point cloud data. Some areas have limited data. The lidar dataset redaction was conducted under the guidance of the United States Secret Service. All data returns were removed from the dataset within the United States Secret Service redaction boundary except for classified ground points and classified water points.

The Chief Technology Office (OCTO) has captured locations for many of the District of Columbia's memorials including statues, cultural facilities, war memorials and other places of historic interest. DC's cultural and memorial treasures are many and therefore this dataset should not be considered a complete list.

The dataset contains lines representing Metro lines in the Washington DC Metropolitan area. Lines were taken from legacy data from WMATA and fit to orthophotography and extracted planimetric data.

The District of Columbia jurisdiction and administrative boundary. The boundary was identified from public land records and digitized using a combination of sources including the 1995 orthophotographs, planimetric data for roads features, U.S. Geological Survey Digital Raster Graphic quad sheets, and the 1999 planimetrics boundary for the Potomac River.This DC boundary is used for the administration, planning, and management of Washington, D.C. by local DC government agencies, commissions and boards. Other administrative legal boundaries such as DC Wards, Advisory Neighborhood Commissions, and Single Member Districts are nested within the DC Administrative boundary.Orthophotography - a computer-generated image of an aerial photograph in which displacements (distortions) caused by terrain relief and camera tilts have been removed. It combines the image characteristics of a photograph with the geometric qualities of a map. Unlike an aerial photograph, an orthoimage has a uniform scale, so it can be used as a base map onto which other map information is overlaid and created. These images, known as orthophotos or orthoimages, provide a consistent scale that enables accurate representation of the District of Columbia's surface. Source: USGS.govPlanimetrics Data - information that represents the horizontal position of features on the Earth's surface, such as roads, buildings, and bodies of water, without including elevation or relief information. This data is often used in mapping and geographic analysis. Source: wikipedia.orgDigital Raster Graphic (DRG) - a scanned image of a U.S. Geological Survey (USGS) topographic map. The scanned image includes all map collar information. The image inside the map neatline is georeferenced to the surface of the Earth. The DRG can be used to collect, review, and revise other digital data. Source: USGS.gov

Roads. The dataset contains polygons representing planimetric roads, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO). These features were originally captured in 2015 and updated in 2017. The following planimetric layers were updated: - Barrier Lines- Building Polygons- Bridge and Tunnel Polygons- Curb Lines- Grate Points- Horizontal and Vertical Control Points- Hydrography Lines- Obscured Area Polygons- Railroad Lines- Recreational Areas- Road, Parking, and Driveway Polygons- Sidewalk and Stair Polygons- Swimming Pools- Water Polygons

Proposed boundaries of the State of Washington DC as passed by US House of Representatives on June 26, 2020.

Alley Street Changes Lines. The dataset contains locations and attributes of Alley Street Changes Lines, created as part of the DC Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies.

Census Year 1930 Census Tracts. The dataset contains polygons representing CY 1930 census tracts, created as part of the D.C. Geographic Information System (DC GIS) for the D.C. Office of the Chief Technology Officer (OCTO) and participating D.C. government agencies. Census tracts were identified from maps provided by the U.S. Census Bureau and the D.C. Office of Planning. The tract polygons were created by selecting street arcs from the WGIS planimetric street centerlines. Where necessary, polygons were also heads-up digitized from 1995/1999 orthophotographs. METADATA CONTENT IS IN PROCESS OF VALIDATION AND SUBJECT TO CHANGE.

0.6 meter contours. This dataset contains locations and attributes of 0.6 meter interval topography data, created using bare earth points from the lidar point cloud data. Some areas have limited data. The lidar dataset redaction was conducted under the guidance of the United States Secret Service. All data returns were removed from the dataset within the United States Secret Service redaction boundary except for classified ground points and classified water points.

This map features a detailed basemap for Washington, DC, including buildings and landmarks in the District. The basemap includes coverage down to about 1:1,000 for the full District of Columbia.The map is based on data from the DC Geographic Information Systems Program (DC GIS). The mission of the DC GIS is to improve the quality and lower the cost of services provided by the DC government, through the District's collective investment and effective application of geospatial data and systems.The map is authored using the World Topographic Map Template for Large Scales. Washington, DC is one of the featured areas of the World Topographic Map. The World Topographic Map includes detailed maps for several cities and areas around the United States.

This layer contains points representing locations for charter schools.