3D modelling using structure from motion technique for land observation in Kelok 9 flyover

In a modern survey, information on the real condition of the study area is required to
support the analysis and interpretation result of a study. However, obtaining information on the
real condition in a wide covered area is difficult, particular in an area that hard to access and
has varied topographic. The method that can imaging the real condition of a study area is
observation using UAV/drone using structure from motion technique. Besides can be observed
with a wide area, the detailed condition of the area also can be visualized. Structure from
motion (sfm) is the technique that determines the spatial and geometric relationship of the
target area through the movement of the camera. In this research, the sfm technique was
applied to create the 3 dimension construction of the Kelok Sembilan flyover. The result show,
3D construction has a high spatial resolution in 2.99 cm/pixel measured in Ground Sampling
Distance (GSD). Meanwhile, the horizontal relative resolution is 5.97 cm, and the vertical
relative resolution is 8.95 cm.