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Time Series Analysis with Satellite image

Change Detection by Fixed Point Observation

※These images in this article were taken by ASNARO-1 and processed for web display use.
※This is a case study article using satellite images with 50 cm resolution.ALOS-3 satellite images with a resolution of 80 cm are also expected to be used in similar fields.

Fixed-point observations by an earth observation satellite are used for the abstraction of changes caused by the disasters and the constructions etc.

Observe volcanic activity, etc.

Nishinoshima Island, a small island in Pacific Ocean, made several eruptions and its figure were drastically changed. It restarted the eruptions again from April 2017. It made the new changes in its shape. Some lava flew down from the top of the mountain to the southwest, and it made two lava rivers to the sea.

Nishinoshima (volcanic island in the Ogasawara Islands)


The changes from 2014 are shown above. The big changes were till 2016 and now new changes started in 2017. Satellite observation where some dangerous places like volcano is one of the useful points of satellite.

Observe minute changes

Another example is the Japanese ancient city, Kyoto where many roads are crossed. Not so drastic change is seen in Kyoto but we can distinguish some changes using detail images.

Kyoto city area


Enlarged images of orange circled area of above is shown in the below. Compared these images shows some buildings were teared down and after that excavations were followed. Kyoto is an ancient city and some times this kind of things happens.


※The images in this article are based on the results of outsourcing projects of the Ministry of Economy, Trade and Industry.

- use case -