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Authors: 邱式鴻
Chio, Shih-Hong
Contributors: 地政系
Keywords: 虛擬基站即時動態定位;光束法平差;空中三角測量;無人飛行載具系統
VBS RTK GPS;bundle adjustment;aerial triangulation;UAS
Date: 2016-08
Issue Date: 2018-03-22 17:17:02 (UTC+8)
Abstract: 無人飛行載具系統UAS可以蒐集高解析度和高品質的影像提供局部製圖。以UAS影像用來局部區域製圖時,UAS影像必須先經精確定位定向。利用衛星定位系統GPS結合慣性導航單元IMU的定位定向POS系統執行直接地理定位是最佳的方法,然而受限於酬載能力,一般民間UAS無法酬載高精度的IMU執行直接定理定位。因此,本研究將討論UAS影像的間接地理定位精度。間接地理定位的第一個處理方法是完全使用分布良好的地面控制點,而不使用GPS觀測量做為空中控制的一般的空中三角測量平差(簡稱空三平差);另一個處理方法是則是使用GPS觀測量做為空中控制的GPS輔助空三平差。本文中,以野外率定場執行相機率定,並提出兩種UAS影像間接地理定位的精度。根據20個平面和29個高程檢核點檢核成果顯示,用Canon EOS 5D Mark II搭配24 mm F/1.4L II USM鏡頭於航高550公尺所蒐集的UAS影像,執行一般空三平差後的立體製圖平面精度0.26公尺(約1.73像元)、高程0.27公尺(約1.80像元);而執行GPS輔助UAS影像空三平差後的立體製圖平面精度則為0.44公尺(約2.93像元)、而高程精度為0.55公尺(約3.67像元)。結果顯示兩種UAS影像間接地理定精度均能滿足台灣地區1/5,000地形圖之製圖精度要求。
Unmanned Aircraft Systems (UASs) can collect high resolution and high quality images for local mapping. Before the UAS images can be used for accurate mapping tasks in local areas, the precise position and orientation of the UAS images should first be determined. Direct georeferencing by POS (Position and Orientation System), a combination of GPS (Global Positioning System) and IMU (Inertial Measurement Unit), is the best choice; however, most commercial UASs cannot carry highly accurate IMUs because of the limited payload. Therefore, this study will discuss the accuracy of indirect georeferencing for UAS images. One approach for indirect georeferencing is general aerial triangulation (AT) by using well-distributed ground control points (GCPs). The other one is GPS-supported AT with GPS observations as airborne controls. In this paper, the camera is calibrated by the field method, and the accuracy of these two approaches for indirect georeferencing is presented. Based on 20 horizontal check points and 29 vertical check points, this study shows the stereoscopic viewing accuracy of general AT for UAS images, collected by Canon EOS 5D Mark II camera with 24 mm F/1.4L II USM lens at a flying height of 550 m, is about 0.26 m (ca. 1.73 pixels) in planimetry and 0.27 m (ca. 1.80 pixels) in height. GPS-supported AT produced the stereoscopic viewing accuracy about 0.44 m (ca. 2.93 pixels) in planimetry and 0.55 m (ca. 3.67 pixels) in height. The test results show that the accuracy of these two indirect georeferencing approaches of fixed-wing UAS images can be used for updating local 1/5,000 topographic maps in Taiwan.
Relation: Journal of the Chinese Institute of Civil and Hydraulic Engineering, Vol.28, No.2, pp.67-76
中國土木水利工程學刊 ; 28卷2期 (2016 / 06 / 01) , P95 - 104
Data Type: article
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