Introduction to GNSS -- Atmospheric delays and Multipath -- Ground-based GNSS Atmospheric Sensing -- Space-borne GNSS Atmospheric Sensing -- GNSS Reflectometry -- GNSS Ocean Remote Sensing -- GNSS Hydrology Sensing -- GNSS Cryosphere Sensing. The versatile and available GNSS signals can detect the Earth's surface environments as a new, highly precise, continuous, all-weather and near-real-time remote sensing tool. This book presents the theory and methods of GNSS remote sensing as well as its applications in the atmosphere, oceans, land and hydrology. Ground-based atmospheric sensing, space-borne atmospheric sensing, reflectometry, ocean remote sensing, hydrology sensing as well as cryosphere sensing with the GNSS will be discussed per chapter in the book.