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研究生:吳維昀
研究生(外文):Wei-Yun Wu
論文名稱:空載光達航帶重疊區點雲資料之系統性高程偏差量偵測與分析
論文名稱(外文):Detection and Analysis of Systematic Height-Offsets in Overlapped Areas of Airborne LIDAR Data
指導教授:曾義星曾義星引用關係
指導教授(外文):Yi-Hsing Tseng
學位類別:碩士
校院名稱:國立成功大學
系所名稱:測量及空間資訊學系碩博士班
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:80
中文關鍵詞:系統性誤差空載光達
外文關鍵詞:Systematic Height-OffsetAirborne LIDAR
相關次數:
  • 被引用被引用:1
  • 點閱點閱:148
  • 評分評分:
  • 下載下載:41
  • 收藏至我的研究室書目清單書目收藏:0
空載光達結合雷射掃瞄儀(Laser Scanner)、全球定位系統(Global Positioning System, GPS)及慣性導航系統( Inertial Navigation System, INS),能快速獲取密佈於地表面之點雲三維坐標,此三個系統率定不完善將導致掃瞄成果具系統性誤差。

消除系統性誤差的方法分為施測前之率定以及施測後之平差改正,施測前率定時,當雷射掃瞄儀置入飛行載具,三個系統間之三軸不平行將產生安置角誤差,一般經由掃瞄平坦率定區以求解此安置誤差。檢驗系統性誤差的方法之一為透過航帶重疊處之共軛點位檢查,然而以空載光達而言不易於高密度的點雲之中找出相對應之共軛點位。

本研究中利用空載光達高精度的特性,將航帶重疊區規則分割成網格,於網格內偵測其中位於不同航帶上的面特徵,並利用此面特徵間之偏差量推算航帶間之相對性系統高程偏差量。本研究經由空載光達的航帶重疊區域的面特徵間之偏差量來偵測航帶間系統性誤差,希望能藉此評估空載光達點雲資料的品質與信任度。偵測出之系統性偏差可以提供作為後續航帶平差動作之用,企圖能消除或減少點雲內系統性誤差對於空載光達航帶的影響。

觀察實驗成果可發現大部分成果偏差量之系統性為顯著,因此可由此方法萃取出後續航帶平差需要之相對性高程系統偏差量,而部分成果偏差量之系統性不顯著,推測掃瞄地區之交通流量等原因產生雜訊影響其成果。
Airborne LiDAR system is a laser scanner integrated with a GPS and an INS. A defective calibration of a LiDAR system may cause systematical bias in LiDAR data. Therefore, precise installation and calibration are required to obtain accurate 3D coordinates of scanned points. One possible way to examine systematical errors of LiDAR data is to check the consistency between the overlaps of flight strips. However, a checking method is needed to find systematical errors between two point clouds of overlapped strips.

In this study, a method is proposed to check vertical bias between point clouds of overlapped strips. First, a grid is established in the overlapped areas in airborne LIDAR data. For each grid location, a fitting plane is calculated from the local point cloud of each strip. Then, the deviation between the fitting planes reveals the systematical height bias between the strips.

The results show the success of finding systematical biases between LiDAR strips. However, some small systematical errors may not be notable due to the mixture of noises. With the calculated biases, it is able to model the relative systematical height bias using strip adjustment.
摘要 II
Abstract II
目錄 IV
表目錄 V
圖目錄 VI
第一章 緒論 1
§ 1-1 研究背景 1
§ 1-2研究動機與目的 2
§ 1-3研究方法與流程 3
§ 1-4論文架構 4
第二章 系統誤差檢驗及航帶平差方法 6
§ 2-1空載光達資料觀測原理 6
§ 2-1-1空載光達系統架構 6
§ 2-1-2空載光達之掃瞄機制 8
§ 2-1-3空載光達之率定方法 12
§ 2-2系統誤差分析與檢驗 14
§ 2-2-1系統誤差分析 14
§ 2-2-2系統誤差檢驗 17
§ 2-3航帶平差方法 19
第三章 重疊區高程偏差量偵測方法 21
§ 3-1 共軛區塊之性質與分析 21
§ 3-2 平均高程法 25
§ 3-3 迭代計演算法 26
§ 3-4 迴歸平面法 29
第四章 實驗方法與成果分析 36
§ 4-1 實驗資料 36
§ 4-2 實驗方法 39
§ 4-3 成果與分析 41
§ 4-3-1 平均高程法 41
§ 4-3-2 迭代計演算法 50
§ 4-3-3迴歸平面法 60
第五章 結論與建議 73
參考文獻 75
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