ALOS (nicknamed ”Daichi”) is a Japanese Earth-observation satellite, developed by the Japan Aerospace Exploration Agency (JAXA) and manufactured by NEC, Toshiba, and Mitsubishi Electric Corp.

The ALOS satellite sensor had three remote-sensing instruments:

  1. The Panchromatic Remote-sensing Instrument for Stereo Mapping (PRISM) and for digital elevation models (DEMs)
  2. The Advanced Visible and Near Infrared Radiometer type 2 (AVNIR-2) for precise land coverage observation
  3. The Phased Array type L-band Synthetic Aperture Radar (PALSAR) for day-and-night and all-weather land observation