- 期刊
航空照片正射化之技術與應用
Rectification of an Aerial Photograph-Technique and Application
摘要
航空照片包含了豐富的地形與地物資訊，但利用航照來進行量測並不如正射投影的地圖來得方便，因此本研究的目的在於尋求一種程式化的方法，將以往產生正射投影航照的繁瑣步驟完全由個人電腦程式來執行。程式處理中，先以空間後方交會原理求出單張航照的外方位參數，再藉由共線條件式及數值地形資料來產生正射投影航照，所獲得的正射航照有良好的座標控制，方便配合地理資訊系統使用。本文選擇八里地區兩個不同年份的航空照片，經正射化後進行海岸線的數化，並量測出前後十五年間海岸線前進及退縮的距離。正射航照具備多方面應用的潛力，諸如環境變遷偵測、崩塌地面積的估算等等，對於地形與地物變化之量化研究，可提供莫大的助益。
並列摘要
The advantage of using an aerial photograph is that contain much topographic and physiographic information. However, performing measurements on it is much complicated than that on an orthophotomaps. Hence, this study tries to seek a solution which can generate ortho image from an aerial photograph. We calculated the six elements of exterior orientation by space resection method first, then created an ortho image of aerial photograph with collinearity condition equations according to a digital terrain model(DTM). The ortho image of an aerial photograph is geocoded thus can easily be integrated into Geographic Information Systems(GIS) . We rectified the aerial photograph s in Ba-Li area with two different years and digitized the coast line in GIS. Finally, we measured the change of coast lines during 15 years. Orthorectified aerial photographs may be applied in many applications, such as environmental change monitoring, measurement of the area of a landslide, etc. In a word, it is a useful tool to make the measurement on an aerial photograph easy and to assist in the study of ground surface changes.