空載光達系統是由雷射掃描系統、GPS、INS 三個系統所組成，系統本身的觀測值會有誤差的產生，許多學者不斷的嘗試提出各種新且有效的率定及航帶平差方法，以改正雷射掃描的各種誤差。如能有一個可以設定不同參數以產生點雲坐標的模擬器來驗證他們所提方法的好壞，將對光達點雲的產製有所助益。因此本研究設計一空載光達模擬器，可進行航線規劃及設定雷射掃描儀參數、飛機飛航參數及誤差參數以產生一組除了偶然誤差外其餘誤差均已知的地面點雲坐標，提供檢定率定方法及航帶平差模式研究之用。
本研究的空載光達模擬器的模型是使用Google 3D 資料倉儲中的擬真建物模型，將該建物模型匯入3D 繪圖軟體中，並與3D 繪圖軟體所繪製的地形組合成一模擬的地貌，再經由模擬器產生所需的點雲坐標。本研究所設計的光達模擬器能提供使用者依照自己的需求建置一個感興趣的光達掃描區域，亦可依使用者要求的點雲密度進行航線規劃。本模擬器可輸出的資料有飛機軌跡資料、飛航計畫、點雲坐標及各種輸入參數，供使用者做後續的分析利用。本研究設計了幾個模擬地形地物作為驗證模擬器可行性，並將掃描完成的地面點雲坐標以展圖軟體展示成果。實驗結果顯示本研究所設計的光達模擬器是簡易且可行的。

Airborne Lidar System consists of three different systems, namely Laser scanner, GPS and INS. Inevitably, there exist errors in the observations of the systems and then in LiDAR point clouds. A number of researchers try to present various methods for the calibration and strip adjustment in order to correct the errors. It is very helpful if one can develop a simulator for airborne LiDAR data processing to test and verify the correctness of these methods. Therefore, this study designs an airborne LiDAR simulator in which not only the laser scanner parameters, the airplane parameters and various kinds of errors can be input, but also a set of LiDAR point clouds with known errors can be produced and can be used to test the calibration and strip adjustment methods.
In this resesrch, the simulator is designed with the help of 3D building models from Google 3D warehouse and terrain data from the 3D drawing software 3DS Max. Building models and terrain are combined in 3DS Max, and are transformed into a specified format for using in the simulator. Finally, the simulator produce a set of LiDAR data desired. User can input the requested parameters to create a experimental area and can also use the output data (eq. the trajectory of airplane, errorless pointclouds) to do further analysis. In this research, several building models and terrains are used to demonstrate the simulator developed here. Their results are plotted using the software PolyWork. Our experiments shows that our developed airborne LiDAR simulator is easily used and very feasible.

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