{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:31:32Z","timestamp":1760243492718,"version":"build-2065373602"},"reference-count":24,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2013,7,12]],"date-time":"2013-07-12T00:00:00Z","timestamp":1373587200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>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.<\/jats:p>","DOI":"10.3390\/s130708879","type":"journal-article","created":{"date-parts":[[2013,7,12]],"date-time":"2013-07-12T10:55:35Z","timestamp":1373626535000},"page":"8879-8894","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Development of a Network RTK Positioning and  Gravity-Surveying Application with Gravity Correction  Using a Smartphone"],"prefix":"10.3390","volume":"13","author":[{"given":"Jinsoo","family":"Kim","sequence":"first","affiliation":[{"name":"Spatial Information Institute, Pukyong National University, 45 Yongso-ro, Nam-gu,  Busan 608-737, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Youngcheol","family":"Lee","sequence":"additional","affiliation":[{"name":"Geologic Hazard & Industrial Resources Research Institute, Pusan National University,  63 Busandaehak-ro, Geumjeong-gu, Busan 609-735, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sungyeoul","family":"Cha","sequence":"additional","affiliation":[{"name":"Department of Civil Engineering, Yangsan University, 321 Myeonggok-ro, Yangsan 626-740, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chuluong","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Spatial Information Engineering, Pukyong National University, 45 Yongso-ro,  Nam-gu, Busan 608-737, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seongkyu","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Spatial Information Engineering, Pukyong National University, 45 Yongso-ro,  Nam-gu, Busan 608-737, Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2013,7,12]]},"reference":[{"key":"ref_1","unstructured":"Scintrex CG-5 Autograv Gravity Meter Brochure Available online: http:\/\/www.scintrexltd.com\/dat\/content\/file\/Scintrex_CG5-DIGITAL-Brochure-R1.pdf."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Torge, W. 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