Objective of accuracy investigation In this study, accuracy investigation of the corrected MMS measurement data by LMU and the mapping data derived from these corrected data were carried out to establish the most appropriate land mark point asignment (position intervaletc.) method at GPS invisible period. The target mapping scale is 1/500 and required accuracy is 25cm RMS for both horizontaland vertical.

Roads are improved and maintained depending on its roles such as transport routes, minelayers of lifelines, refugee roads at disaster and also needs of users. To improve the roads safety and convenience, road authorities need the data to be used to comprehend 3D shape of the road space and its deformation quickly and accurately.