e2fd1bc6-c30c-484c-b78a-e57f2ca0f5d8 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T15:24:42 creation ISO 19115 2016 The status and development of the Asia Pacific Reference Frame (APREF) and its applications e2fd1bc6-c30c-484c-b78a-e57f2ca0f5d8 In the Asia and Pacific region there has been an increase in the number of GNSS CORS networks over the past decades. This provides an opportunity to improve the definition, realization and maintenance of the regional geodetic reference frame, i.e. the so-called Asia Pacific Reference Frame (APREF) in this region. The APREF project is a collaboration of the Geodetic Reference Framework Working Group of the United Nations Global Geospatial Information Management for Asia and the Pacific (UN-GGIM-AP), and the Reference Frame Sub-Commission 1.3e (SC1.3e) of the International Association of Geodesy (IAG). The project is supporting both scientific and regional geospatial activities by densifying and providing access to the International Reference Frame (ITRF). This presentation overviews the status and development of APREF, including the data flow of the APREF GNSS network, routine analysis as well as quality control of the products. An accuracy assessment of the output and products, including the estimated position and velocity field is presented. Some APREF applications examples are also presented, such as monitoring the performance of GNSS stations, and how Australia’s national datum was realized using the products of the APREF project. Presented at the Scientific Assembly of the International Association of Geodesy IAG2021 {"type": "Polygon", "coordinates": [[[112.0, -44.0], [154.0, -44.0], [154.0, -9.0], [112.0, -9.0], [112.0, -44.0]]]} 112.0 154.0 -44.0 -9.0 Asia Pacific Reference Frame - APREF EARTH SCIENCES Global Positioning System - GPS International Reference Frame - ITRF Published_External Link to Abstract Book documentDigital Page 604 of the pdf HTML