The Namegawa River faces frequent mudslides due to active sediment transport, necessitating regular stone removal at the 1st Erosion Control Weir. To optimize this process, SANEI CONSULTANT was tasked by the Tajimi Erosion Control National Highway Office to devise an efficient stone removal plan. Leveraging drone mapping technology, SANEI CONSULTANT captured aerial imagery of the sediment accumulation and used PIX4Dmapper to generate precise 3D models of the site. The resulting data was uploaded to PIX4Dcloud, enabling easy sharing and collaborative analysis among stakeholders.