This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. Rooflines of buildings from 2008 Axis Study aerial survey and updated with architectural files and aerial imagery. Original data is from CAD converted to shapefiles. Building outlines are added upon construction completion with field verification. Buildings are referenced by Building Number (see BUILDINGID field) and Building Name (see LONGNAME field). Last Updated: 09/2015