Aerial Photogrammetry and Object-based Image Analysis for Bridge Mapping: A Case Study on Bintan Bridge, Riau Islands, Indonesia

: Photogrammetry is a good method for determining the geometric properties of an object from the images. The geometry of the object obtained from two or more drawings that are overlaid. It is completely autonomous, ultra-lightweight so-called Unmanned Aerial Vehicle (UAV) which has been commercially available at very economical prices in the community or researchers, and photogrammetric applications. The study area was located at Bintan Island, Riau Islands Province, Indonesia, collecting data on 8th may, 2017 (1 ◦ 3’45.98”N - 104 ◦ 27’49.22”E), with DJI phantom 4 including control range small format air photography (SFAP) which is a low-cost, cost-effective solution for obtaining bridge surface imagery and can also be proposed as a long-distance bridge inspection technique to complement the current bridge visual inspection in Indonesia. Some examples of evaluations on bridges using SFAP are presented to provide remote sensing information and capabilities that serve as an essential tool for monitoring and assessing the construction of the bridge. The measurement of Bintan Bridge is 193 m, the photos were taken from the airplanes around 70 meters and providing top-down views. Bintan Bridge’s structure have specify second distance in left wide is 1.057 < 1560, and specify second distance in right wide is 0.9981 < 1570.