JAXA Japan Aerospace Exploration Agency

	The Earth needs a health check The Advanced Land Observing Satellite-2 (ALOS-2) is follow-on mission from the "DAICHI", which contributed to cartography, regional observation, disaster monitoring, and resource surveys. ALOS-2 will succeed this mission with enhanced capabilities. Specifically, JAXA is conducting research and development activities to improve wide and high-resolution observation technologies developed for DAICHI in order to further fulfill social needs.

The Earth needs a health check

The Advanced Land Observing Satellite-2 (ALOS-2) is follow-on mission from the "DAICHI", which contributed to cartography, regional observation, disaster monitoring, and resource surveys. ALOS-2 will succeed this mission with enhanced capabilities.
Specifically, JAXA is conducting research and development activities to improve wide and high-resolution observation technologies developed for DAICHI in order to further fulfill social needs.

Project Topics

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May 14, 2026 Updated

JAXA Concludes Modification to the Agreement with the Vietnam National Space Center (VNSC) on Satellite Data Exchange

JAXA has concluded a “Modification to the Agreement between the Vietnam National Space Center (VNSC), Vietnam Academy of Science and Technology, and JAXA on the Exchange of Satellite Data”. The agreement was formally exchanged in the presence of Ms. Sanae Takaichi, Prime Minister of Japan, who was visiting Viet Nam for the Japan–Viet Nam Summit Meeting, and H.E. Mr. Le Minh Hung, Prime Minister of Viet Nam. The exchange was conducted by Mr. Yasuo Ishii, Senior Vice...

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Press Release

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Oct. 28, 2025 (14:00) [release]

JAXA and the Road Bureau, Ministry of Land, Infrastructure, Transport and Tourism Sign an Agreement on the Use of Satellite Data for Disaster Management (Japanese Only)
Jun. 3, 2025 (14:00) [release]

Development of a SAR foundation model specialized for Japan's land area based on observation data obtained from ALOS-2 satellite (Japanese Only)

Characteristics of Advanced Land Observing Satellite-2 "DAICHI-2" (ALOS-2)

1) Disaster monitoring of damage areas, both in cosiderable detail, and when these areas may be large
2) Continuous updating of data archives related to national land and infrastructure information
3) Effective monitoring of cultivated areas
4) Global monitoring of tropical rain forests to identify carbon sinks.

The state-of-the-art L-band Synthetic Aperture Radar-2 (PALSAR-2) aboard ALOS-2, which is an active microwave radar using the 1.2GHz frequency range, will, in responding to society's needs, have enhanced performance compared to DAICHI/PALSAR. The PALSAR-2 is capable of observing day and night, and in all weather conditions.

Precise diagnosis of the earth using "L-band SAR" Japanese advanced technology

ALOS-2 will have a spotlight mode (1 to 3m) and a high resolution mode (3 to 10m), whilst PALSAR has a 10m resolution. It will allow comprehensive monitoring of disasters by providing users with more detailed data than DAICHI/PALSAR.
The observation frequency of ALOS-2 will be improved by greatly expanding the observable range of the satellite up to about 3 times, througe an improvement in obserble areas (from 870km to 2,320km), as well as giving ALOS-2 a right-and-left looking function, currently not available on DAICHI/PALSAR.