A Study on Control Surveying of Digital Aerial Photographic Data -- An Example of Cheng-Chi University Campus

台灣地區地小人稠，土地使用情況複雜，因此，土地管理為一重要課題。航攝資料具高空間解析力及幾何真實性之特性，若能快速取得，則有助於長期環境監測與土地永續利用。有鑑於此，本研究以機動性高之直昇機為載具，配合9cm焦距之攝影機，採用11.5cm ×11.5cm像幅之彩色正片，航空拍攝實驗區，並於拍攝前佈設空照標，且利用全球定位系統測定地面控制點。本研究目的在探討小像幅數值影像於重建方位過程中，攝影條件之特性及地面控制之成果，此外，利用解析測圖儀與影像工作站不同量測方法對於空中三角精度影響，結果顯示小像幅亦可完成數值空中三角測量。數位法X、Y、Z方向之RMSE為0.097 m、0.090 m、0.161 m，解析法之RMSE為0.132 m、0.120 m、0.144 m。The objective of this thesis has been to investigate the feasibility of digital aerotriangulation using small format photos. A focal length of 9mm camera mounted on a helicopter with format of 11.5cm by 11.5cm color positives have been used for taking pictures of the research area. The premarked ground control points were surveyed by GPS. Photo control was executed using a Leica BC3 analytical plotter and an Intergraph ImageStation respectively. The coordinates measurements of photo points using the two instruments have been evaluated. Both of interior and exterior parameters computed from digital triangulation and digitized photos have been used to produce the orthoimage. The resultant orthoimage was then superimposed and compared with the existing 1/1000 digital map. The results have indicated that: 1. The RMSE of digital method were X = 0.097m, Y = 0.090m, Z = 0.161m; the RMSE of analytical method were X = 0.132m, Y = 0.120m, Z = 0.144m; 2. Digital aerotriangulation could be performed using small format photos