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題 名 | 軌道修正及光線追蹤應用於SPOT衛星影像正射化=Generation of Digital Orthophoto from SPOT Images Using Orbit Correction and Ray Tracing |
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作 者 | 張立雨; 陳良健; | 書刊名 | 航測及遙測學刊 |
卷 期 | 2:1 1997.03[民86.03] |
頁 次 | 頁43-60 |
分類號 | 440.98 |
關鍵詞 | 軌道修正; 光線追蹤; SPOT衛星影像; 正射化; Orbit correction; Ray tracing; Spot satellite images; Orthographic correction; |
語 文 | 中文(Chinese) |
中文摘要 | 於地理資訊系統中欲進行衛星影像與其他相關土地利用資料之整合中,衛星影像 必須與地圖座標系統一致。因此衛星影像之正射化幾何改正是必要的。有別於傳統航測技術 針對 SPOT 影像先進行光束法方位求解再進行正射化改正,本文提出之方法乃利用載體參數 配合少量控制點進行軌道修正後,再利用光線追蹤法進行 SPOT 影像正射化。本文所提出之 方法包括下列四個主要部分:(1) 利用少量地面控制點配合低階多項式針對衛星軌道進行修 正,(2) 於各控制點相應軌道位置之殘餘誤差以最小二乘過濾法修正,(3) 將修正後之衛星 軌道配合數值地形模型,以光線追蹤之方法求取每一像元所對應之地面座標,(4) 將前述之 各離散點地面座標及影像灰度值以網格化內插以產生正射化之數位影像。實驗結果顯示,在 五個均勻分布之地面控制點條件下, 其正射影像之檢核點均方根誤差在各方向均小於 0.6 像元。 |
英文摘要 | In combining satellite images with other landuse data in geographic information systems, the images must be coincided with the map coordinate system. Thus, the orthographic correction for satellite images is a necessity. Traditionally, the photogrammetric technique reconstructs the orbit parameters using bundle adjustment for SPOT satellite images followed by an orthographic correction procedure. We from another point of view, proposed a scheme which corrects the on-board data by using small amount of ground control points(GCPs). Then, a ray tracing is applied to perform the orthographic correction. The proposed scheme includes four major components: (1) using a few GCPs to first fit the orbit parameter with low order polynomials, (2) performing least squares filtering to fine tune the orbit parameter according to the fitting residuals in the first step, (3) determing the corresponding ground location for each image pixel by ray tracing method using the filtered orbit parameter and a digital terrain model, and (4) grid gray value resampling for output orthoimage. Experimental results indicate that the generated orthoimages attain an accuracy better than 0.6 pixels when 5 GCPs are used. |
本系統中英文摘要資訊取自各篇刊載內容。