The volcano Mt. Unzen-Fugendake became active in November in 1990 after being dormant for 198 years. The resulting pyroclastic flows, rock avalanches, ash showers and mudslides caused devastation in the local area, affecting residents and property alike. In 1994 work began on disaster recovery projects and schemes to limit the impact of future volcanic activity. This work required the use of remotely-controlled, full-sized construction machine due to concerns about workers'safety. It was made possible by combination of remote control and image transmission technologies. Although early survey work at Mt. Unzen-Fugendake had to be done using human workers with an enhanced evacuation system, it was clear that this work should also be done by unmanned systems and over the course of this project, a remote surveying system and a system for displaying execution management lines from remote monitors was developed. The remote surveying system was tested and its applicability to real-world projects was verified. From the results obtained, it became apparent that the technology could be applied to other civil engineering works including dam construction. In this paper, in order to help other developments in civil engineering fields, thed etails of the developed systems, and the applicability of these systems in the No.2 Mizunashi-river check dam project ect are discussed.