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題名 | 衛星影像資料幾何糾正方法精確度比較之研究=Study on Accuracy Comparison of Geometric Correction Procedure of Remote Sensing Data |
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作者 | 鍾玉龍; | 書刊名 | 技術學刊 |
卷期 | 11:1 1996.03[民85.03] |
頁次 | 頁35-48 |
分類號 | 440.98 |
關鍵詞 | 遙感探測; 幾何糾正; Remote sensing; Geometric rectification; |
語文 | 中文(Chinese) |
中文摘要 | 遙測技術應用於森林經營各項資訊的量測日漸普遍,然衛星影像資料於山區複雜地形之下,幾何座標誤差的糾正仍存在著有待克服的困難。本研究針對山區大地衛星影像資料的幾何糾正問題,利用影像處理軟體ERDAS (earth resourcesdata analysis system) 加以分析比較,結果顯示,以不同的比例尺 (1/10,000, 1/25,000, 1/50,000) 為基圖,選擇地面控制點及利用不同階數之多項式處理影像幾何糾正,其間因地理座標轉換所造成之中誤差 (RMSxy) 之間,呈現差異不顯著的關係存在,若僅考慮資料闊的標準偏差時則以1/50,000地形圖為基圖者,其具有較為均質的性質存在,但此現象可能肇因於操作程序之簡易繁瑣有別所造成之累計誤差有關。另外,複雜地形的山區影像,經過幾何糾正後,仍存在幾何的誤差,故多項式與地形間的函數關係,並不足以滿足,也就是說複雜山區之幾何糾正多項式的選取,並非階數越高所得之糾正效果即愈好。於糾正後之影像上選擇檢核點之地圖座標,不宜利用立方迴旋法再取樣後之影像,因其經再取樣後原來影像上存在的一些表徵點或表徵線被圓滑化,造成影像對比的喪失,影響檢核點於螢幕視覺判釋的正確性。 |
英文摘要 | It is more popular to use the remote sensing technique to access the information for forest management. The obstacles in geometric correction of satellite image data, especially in complex topography mountain area, are still troublesome to us. In this research, Landsat Thematic Mapper (TM) data were used and several geometric correction procedures were processed. The results indicated that the root mean square (RMSxy) by using the different map scales (1/10,000, 1/25,000, 1/50,000) for choosing the ground control points (GCP) or the orders of transformation in polynomial equation for geometric rectification are not significant between treatments. Just considering that the standard deviation of RMSxy, GCP taken from maps with a scale of 1150,000 had more homogeneous quality, this might be the result of cumulative error produced by different processing approaches. Convert source coordinates to rectified coordinates in geometric rectification, so the higher order of transformation does not mean the better effect of rectification. It is not appropriate to select checking points from cubic convolution rectified images because the feature line or feature point in the original image was weighted and sleeked in output images. Because it make the image lose contrast, influenced the accuracy of interpretation of checking points. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。