We would invite you to attend IWGI2020 and ISSN2020 in Shanghai and Nanjing from Oct. 19-24, 2020.

International Workshop on GNSS Ionosphere (IWGI2020) - Observations, Advances and Opportunities will be held on October 19-21, 2020, Shanghai, China. More information can be found athttp://202.127.29.4/geodesy/iwgi2020/index.html

International Symposium on Satellite Navigation (ISSN2020) will be held on October 22-24, 2020, Nanjing, China. More information is shown at http://issn2020.csp.escience.cn