D.C. Office of the Chief Technology OfficerMass Points (2008). The dataset contains DTM masspoints derived photogrammetrically to support 2' contours. Masspoints and breaklines were compiled from Spring 2008 aerial photography using softcopy photogrammetric techniques. Masspoint elevations are in based on NAVD US feet. Masspoints and breaklines were compiled to support generation of a TIN and the subsequent processing of 2' contours.ArcGIS DynamicMapLayerhttps://hub.arcgis.com/datasets/3fbeecb7e38846a6a5c3abff2ec71b8b_1engOpen Data DCPublicTopography Spot Elevations [District of Columbia--Washington]Web servicesDistrict of Columbia--WashingtonDistrict of ColumbiaLast Modified: 2024-09-20