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題名 | 克利金空間推估應用於地面控制點選取與影像幾何校正之研究=Application of Kriging Interpolation to Ground Control Point Selection and Image Rectification |
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作者姓名(中文) | 劉俊志; 鄭克聲; | 書刊名 | 農業工程學報 |
卷期 | 49:3 2003.09[民92.09] |
頁次 | 頁20-29 |
分類號 | 440.98 |
關鍵詞 | 影像畸變; 幾何校正; 地面控制點; 高差位移; 克利金空間推估模式; 多項式模式; Geometric distortion; Polynomial trend mapping; Ground control point; Image rectification; Relief displacement; Kriging approach; |
語文 | 中文(Chinese) |
中文摘要 | 影像畸變的幾何校正處理,常用的統計方法是透過原始影像和地理座標的地面控制點資訊計算其座標轉換模式。其中地面控制點選取與座標轉換模式對影像校正精度即扮演舉足輕重的地位。研究中以高程資訊輔助影像校正地面控制點之選取,發現與一般均勻分佈原則相比,呈現較合理的分佈,並建議一套用於高程起伏明顯地區之遙測影像地面控制點選取流程。空載多光譜掃描影像之校正方法比較,克利金空間推估模式相對於一次多項式模式計算出之影像校正精度最大改善效率達40%。對於影像校正精度之計算方式上,建議以交叉驗證法代替傳統檢覈點法。 |
英文摘要 | Rectification of remote sensing images is often implemented using the polynomial trend mapping (PTM) model which employs a set of ground-control-points (GCPs) for estimation of model coefficients. The total number and spatial distribution of the ground control points play a decisive role in the accuracy of image rectification. Among many sources of image distortion, the relief displacement is of most significant, particularly in areas of rugged terrain; therefore, the objective of this study is to establish a GCP selection scheme that considers the spatial variation characteristics of the terrain elevation. Our approach of GCP selection is based on a premise that a GCP set that yields high interpolation accuracy of terrain elevation will also result in high image rectification accuracy. The premise is particularly applicable for areas of rugged terrain where relief displacement is the dominant type of geometric distortion. We first select a set of uniformly distributed initial GCPs, and subsequent GCPs are determined based on a kringing approach of elevation interpolation using digital terrain model (DTM) data. Both check point validation and cross validation were implemented to assess rectification accuracies. The accuracies of elevation interpolation and image rectification are found to be consistent. A criterion for determining the total number of GCPs needed for image rectification is also suggested. |
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