Development of Synergetic-Active Sensor-System for Evaluation of Observations by Earthcare Hajime Okamoto, Kaori Sato, Masahiro Fujikawa, Eiji Oikawa, Tomoaki Nishizawa, Shoken Ishii, Yoshitaka Jin, Makoto Aoki and Nobuo Sugimoto EPJ Web Conf., 237 (2020) 07011 Published online: 07 July 2020 DOI: 10.1051/epjconf/202023707011