Satellite images detected 1,000 dangerous points on the central highway

Through 3 million high-resolution satellite images built into 3D maps, the risk of landslides, floods and diseases can be detected.

When implementing a landslide disaster prevention research project along the main roads in the mountainous areas of Vietnam, scientists using AW3D data discovered more than 1,000 risk points of landslide risk. On the national highways in Central Vietnam , Dr. Ken Tsutsui, NTT Data Corporation (Japan) said on October 5.

The project has used AW3D technology as a global 3D map with a high resolution from 0.5m to 2m, developed by NTT Data Corporation in coordination with Japan Remote Sensing Technology Center.

Through AW3D data aerial photography from Global Earth Group (DigitalGlobe), the study showed the danger points and sent alerts to authorities.

Vietnam map via satellite image.(Photo: ST).

According to Dr. Ken Tsutsui, 3D maps are built based on processing pairs of stereoscopic images created from two or three directions observed with 2.5m resolution optical sensors mounted on ALOS satellites. This is an Earth observation satellite operating continuously for 5 years (from February 2006 to April 2011) to accumulate images of all parts of the world.

The satellite collects a data warehouse of about 3 million images with clear ground vision combined with about a million cut-off stereo vision images as input data. This data is analyzed and compared reality by each unit of latitude / longitude and global altitude (about 24,000 slices). An algorithmic model is designed to analyze and process input data for output according to the user's order.

Output products can analyze, forecast landslides and landslides, mineral resources and water resources surveys, disease analysis .

This technology has been used in the WHO World Health Project and the Japan Space Exploration Agency to deal with polio virus infection in Nigeria in 2014. To estimate the spread of the virus Paralysis of sprints, 3D maps are used for detailed terrain data, allowing capture of river and groundwater flows to prevent the spread of polio virus.

In October 2014, this mapping technology was also used for large-scale landslides in Sri Lanka by comparing terrain data captured by helicopters after a natural disaster for mechanical analysis. prepared for natural disasters and made a recovery plan.

Dr. Ken Tsutsui said the AW3D technology will be developed every day and further improved accuracy.

"In the near future, the AW3D will add high accuracy and add new value-added products to help extract more and more information from satellite images ," said Dr. Ken Tsutsui.