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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/113041


    Title: VBS RTK GPS-assisted self-calibration bundle adjustment for aerial triangulation of fixed-wing uas images for updating topographic maps [Autocalibração de Cameras com uso de VBS RTK para fotogriangulação de Imagens UAS para atualização de mapas topográficos]
    Authors: 邱式鴻
    Chio, Shih Hong
    Contributors: 地政系
    Date: 2016-12
    Issue Date: 2017-09-15 15:20:17 (UTC+8)
    Abstract: Unmanned Aircraft Systems (UASs) can collect high resolution and high quality images for local mapping. If the highly accurate GPS flying trajectory of a UAS is collected, it can support bundle adjustment aerial triangulation (AT) of UAS images and reduce the demands on ground control points (GCPs). This study installs a Trimble BD970 GNSS OEM on a fixed-wing UAS for capturing highly accurate GPS data by using a Virtual Base Station (VBS) RTK GPS technique for AT. Meanwhile, the GPS antenna-camera offset is resolved by stripwise linear drift parameters introduced in GPS observation equations, while performing bundle adjustment for AT. Additionally, self-calibration bundle adjustment is used in VBS RTK GPS-assisted AT to solve incomplete camera parameters calibrated by a close-range photogrammetric approach. The results show that the AT accuracy of fixed-wing UAS images collected with a 24 mm focal-length Canon EOS 5D Mark II camera at a flying height of 550 m above ground level is 0.21 m in planimetry and 0.22 m in height using two cross strips with two full GCPs at each corner of the block. The RMSE of check points from stereoscopic viewing can reach 0.27 m in planimetry and 0.24 m in height. The test results show that the accuracy of VBS RTK GPS-assisted bundle adjustment with self-calibration for the AT of fixed-wing UAS image can be used for updating local 1/5000 topographic maps in Taiwan.
    Relation: Boletim de Ciencias Geodesicas, 22(4), 665-684
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1590/S1982-21702016000400038
    DOI: 10.1590/S1982-21702016000400038
    Appears in Collections:[地政學系] 期刊論文

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