利用三維網格模型繪製一千分之一地形圖之精度評估

Evaluation of the accuracy of drawing 1/1,000 topographic map using a three-dimensional mesh model

本項目的目的是驗證使用三維網格模型繪製地圖的方法是否滿足一千分之一地形圖的精度。本研究根據分析參考文獻的內容總結了影響因素，如：相機類型（穩定性不同的大、中、小像幅相機）、航拍的GSD、飛行計劃（如傾斜攝影測量、影像重疊率）等。根據最可能造成影響的因素，協調可能處理或獲取的數據提供者，制定最終可行的實驗設計方案。以傳統攝影測量結果為對照組，對比真實正射影像與網格模型的製圖精度，驗證其是否滿足一千分之一地形製圖精度要求。經本研究結果顯示，使用三維網格模型繪製地圖的方法尚不能滿足一千分之一地形圖的精度要求。而真實正射影像製圖方法雖然滿足一千分之一地形製圖的精度要求，但可靠性較低，需要藉助專業經驗判斷和選擇適用區域。

The purpose of this project is to verify whether the method of drawing map using a three-dimensional mesh model satisfies the accuracy of 1/1,000 topographic map. This study summarized the influencing factors based on the content of the analysis reference documents, such as: camera type (large, medium, and small frame camera that stability are different), ground sample distance (GSD) of aerial photography, fly-planning (such like oblique photogrammetry, image overlap rate), etc. According to the most likely to cause impact, coordinate the data providers that may be processed or obtained, and draw up the final feasible experimental design plan. Using traditional photogrammetry results as a control group, the accuracy of the mapping results of the true-ortho images and mesh model was compared to verify whether it meets the requirements of 1/1,000 topographic mapping accuracy. In conclusion, the method of drawing map using a three-dimensional mesh model cannot meet the accuracy requirements of 1/1,000 topographic maps. Although the digital mapping method of true-ortho images meets the accuracy requirements of 1/1,000 topographic mapping, its reliability is low, and it needs to be used with professional experience to judge and select the applicable area.