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The Japanese Earth-Observation satellite ALOS, developed by JAXA and launched on 24 January 2006, had the objective to provide the user community with data of sufficient resolution to be able to generate 1:25,000 scale maps.



ALOS mission objectives set by JAXA were to:

  • Develop Digital Elevation Models (DEMs) and related geographic data products
  • Perform regional observation for 'sustainable development' (harmonization between Earth environment and development)
  • Conduct disaster monitoring around the world
  • Survey natural resources
  • Develop sensor and satellite technology for future Earth-observing satellites

The mission included optical and an active L-band SAR sensor payload whose high-resolution data may be used for environmental purposes.

On 22 April 2011, the ALOS satellite was lost due to a power anomaly and completed its operations phase.

More details

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ALOS PALSAR OTF collection maintenance - 31 August 2017

30 August 2017

Due to a scheduled maintenance activity, the ALOS PALSAR OTF Collection will be unavailable (both data search and download) on Thursday 31 August 2017, from 14:00 to 16:00 CEST.

On-The-Fly collection - Maintenance on 03 August 2017

02 August 2017

Due to a scheduled maintenance activity, the following collections will be unavailable on Thursday 03 August 2017:

  • ASAR/SAR from 09:00 to 11:00 CEST
  • TPM from 11:00 to 12:00 CEST
  • ALOS from 14:00 to 15:00 CEST

Minimize Mission Facts and Figures
Operators JAXA (Japan Aerospace Exploration Agency)
Date of Launch 24 January 2006
Status Operations terminated April 2011
Orbit Height 691.65 km
Orbit Type Sun-synchronous near-recursive circular
Repeat Cycle 46 days (with a sub-cycle of 2 days for event monitoring)
Resolution 2.5 m / 10 m multispectral/10-100m SAR
Swath Width 35 – 70 Km/70km/350km

Onboard Sensors provided under TPM

  • PRISM (Panchromatic Remote-sensing Instrument for Stereo Mapping)
  • AVNIR-2 (Advanced Visible and Near-Infrared Radiometer - 2)
  • PALSAR (Phased Array L-band Synthetic Aperture Radar)