Home blog “Jilin-1” Satellites’ RS Imagery Helps Relief after Lao’s Dam Collapse

“Jilin-1” Satellites’ RS Imagery Helps Relief after Lao’s Dam Collapse

0 views  2018-08-24 23:57:55

On the night of July 23, 2018, the subsidiary dam of a hydropower dam in Laos collapsed and caused huge damages and loses affecting 13,000 domestic people. To assist Laos in its disaster relief and recovery, China GEO (Group on Earth Observations) Sharing System sent urgent needs of remote sensing data to its members on the platform, after which Changguang Satellite Technology, one of the GEO members in China responded at the first time commanding its Jilin-1 satellites to image the affected area for several times and delivered data to Laos’ related departments as part of its efforts to help the post-disaster relief and reconstruction.

The flooding has claimed dozens lives, left hundreds of people missing, more than 6,600 people homeless and 11,777 people in 357 villages affected after the subsidiary structure of the Xepian-Xe Nam Noy hydropower dam under construction in the Attapeu province, the southernmost part of the country broke, as Reuters reported. Predicted impacts include a decrease of 30 to 40 percent in fisheries by 2040 as well as a drastic cut in food security and farm productivity, as well as greater poverty in much of the Lower Mekong Basin.

Officials have brought boats to evacuate people in San Sai district of Attapeu province, as water levels rise after the collapse. A joint team of Lao and Chinese rescuers reached Attapeu on the afternoon two days later. Experts said the remoteness of the affected area could hamper relief operations. “The roads are very poor. The water’s all out of the reservoir now and the water levels are already going down but I don’t think they’ll be able to fix it until the dry season. People don’t usually go in that area during the rainy season. There are mountains nearby that villagers might be able to get up on … I don’t think anybody really knows for sure.”

Rescue teams from China and Thailand headed on July 25 into a remote part of landlocked Laos, where more than 3,000 people were stranded after a dam collapse sent a deluge of water across a swathe of villages. [Image/Reuters]

Villagers evacuate after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 24, 2018. [Image/Reuters]

The following thematic images taken by Jilin-1 Constellation demonstrate the affected downstream villages of the Xepian-Xe Nam Noy hydropower dam under construction in the Attapeu province, processed from imagery data collected by the Jilin-1 Video 05 Satellite at 12: 56 July 31, 2018 (Beijing Time). The images have a latitude and longitude range of 106.264°-106.935°E, 13.821º-16.164ºN, covers a total area of 5,000 square kilometers and containing a data volume of 114.4GB. As the images show, large patches of farmlands of the villages at the downstream of the collapsed dam are flooded and houses are also surrounded by water.

Up until now, Jilin-1 Constellation is kept photographing the affected areas of the flooding in Laos.

Thematic image indicating affected villages at the downstream of the collapsed Xepian-Xe Nam Noy hydropower dam in the Attapeu province. [Image/Chang Guang Satellite Technology]

Thematic image indicating affected villages at the downstream of the collapsed Xepian-Xe Nam Noy hydropower dam in the Attapeu province. [Image/Chang Guang Satellite Technology]

Over the past years, Chang Guang Satellite Technology has been actively participated in supporting disaster relief work in the international community initiated by GEO. For example, the Nov 12 Iraqi Earthquake in 2017, Nov 14 Earthquake in New Zealand’s South Island in 2016, hurricanes in the south Pacific, etc. Its Jilin-1’s high-resolution push-broom imagery and video data has own itself good credit among its international users.

A diagrammatic picture of Jilin-1 A Satellite in the space. [Image/Chang Guang Satellite Technology]

The Jilin-1 satellites, launched on October 7th, 2015, has a total of 10 in-orbit satellites up till now. The satellites of small sizes, lightness, strong stability and rapid mobility, is capable of revisiting the same spot on earth twice per day; has a spatial panchromatic resolution up to 0.5m; can take as long as 120-second 4K HD gaze color-video with a resolution less than 1m and wide-frame images which is up to 11km×4.5km swath width.. It delivers most timely remote sensing data on areas including defense, agri-forestrial production, environmental surveillance, smart city, geographical mapping, land planning, etc.

Letters of requests and acknowledgements. [Image/Chang Guang Satellite Technology]

The GEO, the largest inter-governmental organization in earth observation, now has a total number of 105 member countries and 126 organizations, in which China is one of its founders and co-presidency. The Chinese GEO was established and is now administered by the National Remote Sensing Center affiliated to the Ministry of Science and Technology, which has organized and coordinated relief work for many international disasters and plays an important role in international disaster alleviation and rescue.

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