A round of geospatial scanning has been performed nationwide in Singapore to generate a set of 3D Maps. For the maps to be usable, intelligent systems needs to be adopted to keep the maps up-to-date. Available in the market are high-precision positioning/mapping hardware (from Trimble, Leica Geosystems, etc.). These survey-grade, high-precision systems are accurate. But they are not cost effective and require technical skills to operate and perform processing work. In order to achieve scalability across the whole nation, there is a need for technologies that are cost effective and ‘light weight’.