Updates of Calibration and Validation Plan of the Advanced Optical Satellite (ALOS-3)

Abstract

The “Advanced Optical Satellite” (ALOS-3, nicknamed “DAICHI-3”) is the next high-resolution optical mission as a successor of the Advanced Land Observing Satellite (ALOS) in Japan Aerospace Exploration Agency (JAXA), and will be launched in Japanese Fiscal Year 2021. The mission objectives of ALOS-3 are (1) to contribute safe and secure social including provisions for natural disasters, and (2) to create and update geo-spatial information. The “wide-swath and high-resolution optical imager” is designed to be achieved the missions, which consists of the panchromatic band with 0.8 m ground sampling distance (GSD) and multispectral six bands with 3.2 m GSD, and the observation swath width is 70 km at nadir. This paper introduces the updated calibration and validation plan of ALOS-3 at JAXA. As the target accuracy of ALOS-3 standard product, the absolute geometric accuracy is 1.25 m in horizontal and 2.5 m in vertical with GCPs (1 sigma), and the absolute radiometric accuracy is +/−10 % for multispectral band.