有理函數模式於高解析衛星影像幾何改正之應用

Geometric Correction of High Resolution Satellite Image via Rational Function Model

張智安(Tee-Ann Teo) ； 陳良健(Liang-Chien Chen)

《航測及遙測學刊》 12卷3期 (2007/09) Pp. 257-272

https://doi.org/10.6574/JPRS.2007.12(3).5

摘要

由於具標準化及簡潔之特性，有理函數模式廣泛應用於高解析衛星影像之幾何處理。針對高解析衛星影像幾何改正之有理函數模式可分為兩種形式，第一種是直接法有理函數模式，使用地面控制點直接計算有理函數係數，建立物像空間轉換關係；第二種是間接法有理函數模式，使用衛星載體資料間接計算有理函數係數，再以地面控制點精化有理函數模式，完成物像空間轉換關係之建立。本研究之目的為比較這兩種有理函數模式形式於高解析衛星影像之幾何改正。實驗中使用IKONOS衛星影像進行分析，實驗結果顯示，直接法較間接法有理函數模式需較多控制點，直接法與間接法分別需要21及6個控制點可達次像元精度。

關鍵字

幾何校正 ； 有理函數模式 ； 高解析衛星影像

並列摘要

Due to its standardization and simplicity, rational function model has been widely used in the geometric correction for high resolution satellite images. The rational function model includes direct and indirect methods. The direct method uses the ground control points to determine the rational polynomial coefficients directly. The indirect one uses on-board data to establish the rational polynomial coefficients. Then, a small number of ground control points are applied to refine the model. This investigation compares the geometric precision of direct and indirect rational function model for high resolution satellite images. Test data includes an IKONOS satellite image with 1 meter resolution. Experimental results indicate that, direct method needs more control point when compared to the indirect method. Both of the direct and indirect methods may reach sub-pixel accuracy when 21 and 6 control points are applied, respectively.

並列關鍵字

Geometric correction ； Rational function model ； High resolution Satellite Images