2021/03/18：Observation results for the Port of Nagoya were updated : Updated observation results up to the February 2021 (Fig. 1-3).
2020/12/23: Observation results for the Port of Nagoya were updated : Updated observation results up to the first half of October 2020 (Fig. 1-3).
2020/08/25: Observation results for the Port of Nagoya were updated : added the results until the first half of August 2020 (Fig 1-3).
2020/07/20: Observation results were added.
2020/06/25: This article was released.
Synthetic Aperture Radar (SAR) can be used to observe the earth's surface day and night in all weather conditions. The combination of PALSAR-2, JAXA's L-band SAR onboard ALOS-2 and C-band SAR onboard European Sentinel allows us to observe the conditions of containers, vehicles, etc. at container terminals. Here, the changes of containers, vehicles, etc. in the container terminals at the Port of Nagoya and the Port of Mikawa (Toyohashi) in Aichi Prefecture are shown under COVID-19 pandemic. Both of the ports have a high volume of imports and exports in Japan.
The Port of Nagoya has continued to grow in importance for trade since it opened in 1907. The amount of cargo handled at the Port of Nagoya was 197 million tons in 2018, the number one in Japan. In addition, about 1.4 million completed vehicles are exported from the Port of Nagoya, which is also Japan's number one.
JAXA observed changes in container and car parking at the Shimpomachi container terminal using the Land Observing Satellite-2 (ALOS-2: Daichi 2) observation data from the end of November 2019 to June 2020. It was observed that the number of containers and vehicles decreased during COVID-19 pandemic period.
Fig 1-1 shows the difference in the Shimpomachi container terminal between November 2019 (blue) and May 2020 (red). The red color indicates that some objects were existed only in May 2020 in the location. The blue color indicates that some objects were existed only in November 2019 in the location. There are a lot of blue color in the container terminal. It is means that there are no containers in May 2020 in spite of there were many containers in November 2019.
In addition, Fig 1-2 shows car container density change in a time series animation from November 2019 to June 2020 using data by ALOS-2. It shows the change in the quantity of containers and cars were changed. Fig 1-3 shows the density of car containers in the ALOS-2 and Sentinel-1 image since the end of November 2019 to October 2020. According to satellite image analysis, though the density estimation of cars and containers had been decreased until August, it were turned to increasing. The recovery trend continued by December. However, in 2021, it has been in a downward trend again. Based on the results, we presume that an export of Nagoya port had decreased since the state of emergency in April and turned to recovery October to December, but it has been decreased in 2021.
Fig 2-1 shows the difference in the Jinnofuto of the Port of Toyohashi between January 2020 (blue) and May 2020 (red). Fig 2-2 shows the changes in cars and containers at the Port of Toyohashi. The total number of cars and containers at the Port of Toyohashi does not seem to change significantly.