Topographic Contour Survey

This document establishes the standard and specification for three dimensional (3D) topographic mapping and survey in Singapore. It encapsulated detailed procedures from acquisition to production of 2D/3D topographic CAD drawings and 3D topographic model. This document covers the 2 major elements of topographic survey process, the data capturing and the data presentation (output). For data capturing, to embrace and respond to rapid evolution of technologies, terrestrial laser scanning (TLS) and mobile laser scanning (MLS) are covered in the document as a tool to capture high quality 3D data output to produce 3D models with well-defined absolute and relative accuracy. Surveyors shall determine the appropriate equipment and efficiency to satisfy user’s requirements. Lastly, the document is not intended to replace technical specifications stipulated by clients. Contractual agreements between practitioners and clients shall take precedence over this document in the event of disputes.