Historic Landmark Sites

Geospatial inventory of Historic Properties in Mecklenburg County, NC.

The true color orthoimages were acquired as part of the DC Geographic Information System (DC GIS) and captured at 20cm resolution. A companion downloadable mosaic is available as a compressed MrSID format.

The dataset contains locations and attributes of building construction and alteration permits applied for and approved by the District of Columbia Department of Buildings. These data are shared via an automated process where addresses are batch matched (geocoded) to the District's Master Address Repository. Users may find that some data points will contain 0,0 for X,Y coordinates resulting in inconsistent spatial locations. Addresses for these data points could not be automatically geocoded and will need to be manually geocoded to 'best fit' locations in DC.

This dataset contains georeferenced aerial imagery from 1927 and 1930 covering the District of Columbia. The original photographs were created as part of early aerial survey efforts and are held within a combined National Archives and Records Administration (NARA) catalog entry (NARA ID 139056920), Record Group 328. The images were scanned by the National Capital Park and Planning Commission, Federal Projects Planning Division (ca. 1926–ca. 1952). A multi-agency collaboration—including the Historic Preservation Office, OCTO, DHS, OP, DOEE, DOH, and FEMS—completed the georeferencing and mosaic development. As part of this effort, the team georeferenced and cataloged the full 1927 aerial photo series of the District, derived from more than 700 high‑resolution image scans. The resulting mosaic and index provide a historic baseline for land use, urban development, environmental analysis, and cultural resource research.

The true color orthoimages were acquired as part of the DC Geographic Information System (DC GIS) and captured at 1 foot resolution. A companion downloadable mosaic is available as a compressed MrSID format.

The true color orthoimages were acquired as part of the DC Geographic Information System (DC GIS) and captured at 0.3-meter pixel resolution (approximately 1-foot). A companion downloadable mosaic is available as a compressed MrSID format.