Advanced Land Observing Satellite 4 (ALOS-4), also called Daichi 4, is a 3,000 kg (6,600 lb) Japanese synthetic-aperture radar (SAR) satellite that was launched on July 1, 2024. It is a successor to the ALOS-2 satellite, which carries the PALSAR-2 sensor. ALOS-4 is the fourth SAR satellite operated by JAXA, following JERS-1, ALOS, and ALOS-2.
Monitoring of disasters
Following the 2024 Noto earthquake, ALOS-2 conducted observation of the Noto Peninsula, which took one week to complete. ALOS-4 meanwhile will be capable of observing the same swath by passing overhead of the area only once.[1]
