title: Development of a network RTK positioning and gravity-surveying application with gravity correction using a smartphone.
abstract: This paper proposes a smartphone-based network real-time kinematic (RTK) positioning and gravity-surveying application (app) that allows semi-real-time measurements using the built-in Bluetooth features of the smartphone and a third-generation or long-term evolution wireless device. The app was implemented on a single smartphone by integrating a global navigation satellite system (GNSS) controller, a laptop, and a field-note writing tool. The observation devices (i.e., a GNSS receiver and relative gravimeter) functioned independently of this system. The app included a gravity module, which converted the measured relative gravity reading into an absolute gravity value according to tides; meter height; instrument drift correction; and network adjustments. The semi-real-time features of this app allowed data to be shared easily with other researchers. Moreover, the proposed smartphone-based gravity-survey app was easily adaptable to various locations and rough terrain due to its compact size.
authors.affiliation: Spatial Information Institute, Pukyong National University, Nam-gu, Busan, Korea. pknu9680@gmail.com
authors.forename: Jinsoo
authors.initials: J
authors.lastname: Kim
authors.forename: Youngcheol
authors.initials: Y
authors.lastname: Lee
authors.forename: Sungyeoul
authors.initials: S
authors.lastname: Cha
authors.forename: Chuluong
authors.initials: C
authors.lastname: Choi
authors.forename: Seongkyu
authors.initials: S
authors.lastname: Lee
mesh_terms: D000465:Algorithms; D016477:Artifacts; D040421:Cell Phone; D003195:Computer Communication Networks / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D040362:Geographic Information Systems / Q000295:instrumentation*; D006112:Gravitation; D063731:Mobile Applications; D012985:Software Design