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題 名 | 應用錐體斷面法進行重力地形改正之研究=Application of Conical Cross-section to Terrain Correction for Gravity Reduction |
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作 者 | 陳國華; 饒瑞鈞; 王建立; | 書刊名 | 中正嶺學報 |
卷 期 | 39:2(A) 2010.11[民99.11] |
頁 次 | 頁187-196 |
分類號 | 440.917 |
關鍵詞 | 地形改正; 錐體斷面法; Terrain correction; Conical cross-section; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究提出一改良的地形改正法–錐體斷面法,在大地水準面與地表測站之間直接進行地殼質量之引力改正。錐體斷面法以測站為原點,將測站周圍之地形劃分為數個等圓心角的扇形錐體區塊,並以各扇形錐體區塊中心線之縱斷面高程資訊擬合真實地形的變化情況,使得地形改正更趨精確。本文選擇台灣地區4個不同地形特徵之測試點進行分析,由成果顯示,當測站周圍劃分12個以上之扇形錐體區塊時,錐體斷面法所得之地形改正量將趨至一穩定值,其與Hammer法計算結果之差異,在玉山頂約為12.6 mgal,其餘測試點之差異約為4 mgal。然而,在地形較複雜的區域,錐體斷面法較Hammer法更能獲得符合真實地形變化之地形改正結果。 |
英文摘要 | An improved approach for Terrain Correction (TC), named Conical Cross-section method, is demonstrated in this study. Conical Cross-section method directly corrects the effect from gravity attractions between surface surveying-site and geoid. For estimating TC precisely, Conical Cross-section method assumes surveying-site as an original point, and divides surveying-site’s neighbor topography into several sector areas with equal central angle to describe the variance of topography. In this paper, four specific points were selected from different features of topography. From the calculated results, we found out the TCs would be into a stable status by using twelve or more equally divided sectors of topography. The compared results between Conical Cross-section method and Hammer’s method are within 4 mgal at three specific points except YuSan peak of 12.6 mgal. However, the Conical Cross-section method is more suitable than Hammer’s for TCs in complex topography area. |
本系統中英文摘要資訊取自各篇刊載內容。