空載三線式掃描儀影像立體定位之研究

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姓名

林士哲(Shih-Che Lin) 查詢紙本館藏

畢業系所

土木工程學系

論文名稱

空載三線式掃描儀影像立體定位之研究
(Three-Dimensional positioning for airborne three-line-scanner imagery)

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摘要(中)

空載三線式掃描儀有較高的空間和光譜解析力，且影像具有良好之幾何交會條件，可為環境遙測、地理資訊系統及立體定位之資料來源。飛行中可拍攝三個方向影像，其成像具有高重疊的特性，使用光束法完成方位求解。在本研究中加入附加參數計算影像像坐標，外方位參數使用時間的多項式進行密合，以控制點和影像連結點完成方位計算，最後並使用最小二乘過濾法修正系統誤差。使用之資料為GPS/INS初步校正後之等級一(Level 1)影像。
研究中主要包含下列四項工作，(1)定義各影像之像坐標，利用附加參數計算不同觀測方向影像之像坐標，(2)光束法平差計算，利用地面控制點和影像連結點，給定不同的權，進行方位求解，(3)加入最小二乘過濾法進行系統性誤差修正，及(4)檢核成果，利用人工量測的影像連結點為檢核點，以空間前方交會檢核地面三維坐標之精密度。使用之測試資料共包含六個航帶，使用每一航帶之三張不同拍攝方向影像之影像連結點外，並加入航帶之間的航帶連結點進行光束法平差。實驗結果顯示以多航帶光束法求解方位，加入交叉飛行航帶後，可提升其整體精度，重疊區之精度亦可獲得提昇。

摘要(英)

Airborne three-line-scanner images have the merits of high spatial and spectral resolutions and excellent converging geometry. Thus, the images have become an important data source in environmental remote sensing, GIS and three dimensional positioning. The three-line-scanner acquires three different direction images, which have plenty of overlapped area in flying. Thus, the bundle adjustment is selected to calculate the dynamic orientation parameters. The additional parameters will be included in the adjustment. The orientation parameters are modeled using low-order polynomials with respect to time by employing GCPs and tie points. The process might contain local systematic errors for the data with high dynamics, thus, a least squares filtering that performs orbit collocation is included. In this investigation, Level 1 images that have been preliminarily rectified using GPS and INS data are investigated for 3-D positioning.
In this investigation four major steps are included: (1) definition of image coordinates for three-look images including additional parameters, (2) calculation of orientation parameters using bundle adjustment, (3) collocation of the orientation parameters by least squares filtering, and (4) accuracy validation. The test data include six trips. In bundle adjustment, the tie points are selected for each of the three-look images that appear in the overlapped area of strips. The experimental results indicate that the bundle adjustment could reach higher accuracy when the cross trips are employed.

關鍵字(中)

★ ADS 40
★ 最小二乘過濾
★ 光束法
★ 三線式掃描儀

關鍵字(英)

★ Three-Line-Scanner
★ ADS 40
★ Least Squares Filtering
★ bundle adjustment

論文目次

目錄
摘要 i
ABSTRACT ii
致謝 iii
目錄 iv
圖目錄 vi
表目錄 viii
第一章、前言 1
1.1 研究動機與目的 1
1.2 研究方法及內容 4
第二章、空載三線式掃描儀簡介 7
2.1 空載三線掃描儀 7
2.2 ADS40影像種類簡介 10
第三章、影像方位重建 12
3.1 光束法平差模式 14
3.1.1外方位參數 15
3.1.2 共線條件式 15
3.1.3 方位參數起始值 19
3.1.4 光束法觀測方程式 20
3.1.5 收斂之門檻 24
3.2 最小二乘過濾精密修正 25
3.3 精度評估 27
3.3.1 空間前方交會 28
3.3.2 誤差橢圓 29
第四章、實驗結果及分析 31
4.1 實驗資料 32
4.2實驗結果分析 35
4.2.1單一航帶之方位求解 35
4.2.2 使用控制點之光束法成果 43
4.2.3 光束法加入影像連結點成果 45
4.2.4 水平航帶與加入交叉航帶之精密度分析 49
4.2.5 水平航帶與加入交叉航帶之精確度分析 53
4.3 實驗結果摘述 59
第五章、結論與展望 62
參考文獻 64

參考文獻

參考文獻
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指導教授

陳良健(Liang-Chien Chen)

審核日期

2005-7-19

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