Town Survey Marks (TSM)

A standard Town Survey Mark (TSM) comprises of a brass peg in concrete at a depth of at least 24cm underground. It is protected by a cast iron cover placed flush with the ground surface. TSMs form part of an integrated surveyed system of control points throughout South Africa. The TSM dataset comprises of approx. 10000 control points at regular intervals within the municipal boundary of the City of Cape Town. They are maintained on an ongoing basis with its mandate given by the Land Survey Act 8 of 1997, section 42(4)a. TSMs are installed and surveyed to highest possible accuracy standards, usually at sub centimeter level. Their locational co-ordinates are determined by network adjust methods and precise levelling. Co-ordinates are based on the South African Hartebeesthoek 94 Datum and the World Geodetic System 1984 (WGS84) as ellipsoidal reference.<div>All spatial layers are served <b>live</b> from internal systems, an item's &quot;<i>Last Updated</i>&quot; or &quot;<i>Publish Date</i>&quot; refers to the <b>Metadata</b> only.<br /></div>