查詢結果分析
來源資料
頁籤選單縮合
題 名 | 建立集水區地文因子查詢系統=The Establishment of Inquiry System for Watershed Geomorphic Factors |
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作 者 | 李光敦; 楊銘賢; 鄭璟生; | 書刊名 | 農業工程學報 |
卷 期 | 47:1 2001.03[民90.03] |
頁 次 | 頁75-86 |
分類號 | 436.124 |
關鍵詞 | 地文因子; 數值高程模式; 查詢系統; Geomorphic factor; DEM; Inquiry system; |
語 文 | 中文(Chinese) |
中文摘要 | 早期對於集水區地文資料,皆由人工判讀等高線方式,以劃分集水區邊界,再以測線儀與求積儀等設備,量取河川長度、次集水區面積與河川及漫地流坡度等因子。近年來由於遙測與航照技術發達,加上電腦計算愈趨快速,地文因子之擷取已趨向數位化之方向發展。 本研究運用ArcView GIS軟體於單一視窗可顯示不同主題圖層之功能,將經由數值高程資料計算之集水區邊界、河川網路、河川級序與次集水區漫地流區域等主題分別呈現。此外,在地文因子查詢上,本研究所建立之查詢系統,可藉由ArcView GIS軟體連結外部計算模組的功能呼叫數值高程模式,以滿足使用者對集水區內河川上任意位置點之地文因子查詢。 本文以屏東縣林邊溪流域為例,建立集水區地文因子查詢系統,以提供水利工程規劃設計過程所需之地文因子。研究中同時針對中下游河川網路修正問題予以深入探討,以避免經由數值高程資料所得之水系與地形圖上之河川網路,呈現不一之現象。 |
英文摘要 | In traditional watershed geomorphology analysis, the geomorphic factors are usually obtained manually based on topographic maps determination. By using planimeters and odometers, geomorphic factors such as: channel length and slope, overland length and slope, as well as subwatershed area can be calculated. Recently, due to the progresses of the techniques in remote sensing, aerial photography, and computer science, the watershed geomorphic database has been digitalized and more easily to be analyzed than before. In order to display different themes in a window, the inquiry system was constructed based on an ArcView GIS environment. The analytical results such as watershed boundary, stream network, stream order, and subwatershed area can be shown simultaneously in this system. Furthermore, an external calculation module was constructed in the inquiry system. Users can interactively select any point in the stream network only clicking on the mouse, and consequent calculation procedures will be conducted. The Lin-Pien watershed in Ping-Tung County is adopted as an example in this paper. The inquiry system for watershed geomorphic factors is established, which can provide enough geomorphic information for watershed resources engineering planning and management. A modification procedure for the downstream stream network extracted from a digital elevation model (DEM) is proposed, which can alleviate the differences between the stream network generated by DEM and that in topographic maps. |
本系統中英文摘要資訊取自各篇刊載內容。