[Hachijojima Island - Akama Construction Co., Ltd. Site Manager Motokazu Ommi Case] Drone Point Cloud Survey Introduced for Disaster Restoration Work | Visualizing Landslide Volume Reduces Construction Period by 75%

ARA Co., Ltd. (Headquarters: Kawasaki City, Kanagawa Prefecture, Representative Director: Masanori Arai) has achieved significant operational efficiency by introducing drone-based point cloud surveying technology for survey tasks in disaster restoration construction.

This initiative was implemented for slope stabilization work to prevent the collapse of private houses, following a landslide disaster in Ichinosawa, Ohsato, Hachijojima Island.

■ Initiative Details

In this project, survey data of the forest acquired before the disaster was compared with post-disaster drone survey data to calculate the scope of the landslide and the volume of collapsed soil.

Additionally, the number and trunk diameter of fallen trees were measured to obtain data necessary for the restoration plan.

The acquired data was visualized as a 3D point cloud, accurately calculating the collapse status and soil volume (cubic meters), and was utilized as submission material for administrative agencies.

■ Survey Overview

・Target Area: Approximately 17,000㎡ (approx. 5,151 tsubo)

・Survey Content:

　- 3D point cloud survey of the landslide area

　- Calculation of soil volume by comparing topography before and after the disaster

　- Survey of the number and trunk diameter of fallen trees

■ Results

・Visualized landslide area as 3D data

・Calculated collapsed soil volume (cubic meters)

・Utilized as data for administrative submission

👉 Contributed to improved accuracy of disaster restoration plans

■ Implementation Effects

Conventional Survey

・Construction Period: 2 days

・Personnel: 6 people

・Cost: Approx. 700,000 yen

Drone Survey

・Construction Period: 0.5 days

・Personnel: 3 people

・Cost: Approx. 400,000 yen

👉 75% reduction in construction period

👉 50% reduction in personnel

👉 Approx. 40% reduction in cost

■ Stakeholders

Construction Company: Akama Construction Co., Ltd.

Site Manager: Motokazu Ommi

Surveyor: 1 person

Drone Survey: ARA Co., Ltd.

Pilots: Ryuji Kaneko, Tomoaki Inoue

■ Future Development

ARA Co., Ltd. will continue to promote the use of drones and 3D point cloud technology in the fields of disaster restoration, infrastructure inspection, and building surveys, contributing to improved productivity and safety in the construction industry.

■ Service Areas

・Real Estate Developers

・Construction Companies

・Civil Engineering Companies

・Land Development Contractors

・Surveying Companies

■ Subcontracting Services

We actively offer subcontracting services for drone surveying to surveying and construction companies.

・Urgent projects

・Labor shortages

・Cost adjustments

・Spot services

■ Future Expansion

ARA Co., Ltd. will expand its business as a company that provides total support for building and land maintenance by offering one-stop services using drones for:

・Exterior wall inspections

・Solar panel inspections

・Infrastructure inspections

・Land surveys

■ Company Profile

As a construction company involved in exterior renovation work for public institutions such as Tokyo Metropolitan Government, UR Urban Renaissance Agency, JKK Tokyo, and JKK Kawasaki, we provide a one-stop service from drone-based exterior wall inspections and surveys to renovation work.

Management Innovation Certified School

Drone School Tokyo Group

Drone School Commons Tachikawa-Tachihhi

Location: Tachikawa City, Tokyo

Phone: 0120-874-075

Email: [email protected]

Operating Company: ARA Co., Ltd.

Location: Kawasaki City, Kanagawa Prefecture

Representative: Masanori Arai

Phone: 044-798-5454

Email: [email protected]

Business Content: Large-scale renovation work, drone surveying/inspection, exterior wall surveys, etc.

"Currently offering special prices for the first project only. Due to increasing inquiries, available slots are limited."