Results of ALOS-2 PALSAR-2 Calibration and Validation After 3 Years of Operation

This paper reports the result of over 3 years routine calibration and validation works for the Phased Array type L-band Synthetic Aperture Radar-2 (P ALSAR-2) onboard the Advanced Land Observing Satellite-2 (ALOS-2). The major observation modes and beams were evaluated, and we confirmed that the PALSAR-2 product satisfy its specification over 3 years: absolute radiometric accuracy is less than 0.5 dB, geometric accuracy is less than 10 meters (RMS), and polarimetric calibration was successfully conducted.