濱線繪製(shoreline mapping)包含濱線調查、圖像資料測繪以及濱線的疊圖比對，濱線繪製的目的在於決定濱線位置及定量濱線變化。國外濱線繪製成為研究議題已三十多年，國內濱線繪製相對於國外缺乏統一的繪製標準及流程，且航拍時未考慮天候及海象條件。所以本文研究重點放在大比例尺影像地圖(比例尺≧1：5000)濱線指標的選定判別，並評估海象狀況對濱線所造成的影響。
本研究以台東海岸近二十年的濱變遷為例，採用像片基本圖第一版、海岸像片地形圖及彩色正射影像圖三版大比例尺影像地圖，詳細探討應用歷年大比例尺地圖量化濱變遷，所應注意的事項與涉及的誤差。討論重點分為濱線數化及濱線變化量分析兩部分：前者探討濱線數化過程中底圖放大倍率、濱線指標選取的操作型定義；後者則提供濱線分析時基準線的選擇以及量測線間距定訂的方法。所獲主要結果如下：
本研究提供國內應用大比例尺地圖濱線繪製的流程，在濱線指標的選取上，國外研究認為平均高水位線及高水位線為最佳的濱線指標，但因已出版的地圖並非針對海岸變遷而製作，缺乏野外實測資料配合，高水位線在地圖上的辨識度低，並非國內大比例尺影像地圖最佳的濱線指標。考慮濱線指標的連續性、穩定性及辨識度，乾濕線為較佳的濱線指標。濱線分析上：宜以濱線為基準線，因濱線最能符合海岸變化趨勢；濱線曲率越大，量測線垂直基準線產生間距應越小，此數值在台東海岸北段為50 m，南段為100 m。
以台東海岸為例，評估濱線擷取過程中的誤差，圖資誤差為 ±6 m，人為數化誤差 ±2 m，潮位影響在沙灘為 ±6 m、礫灘為 ±2 m，整體誤差近 ±9 m，相較卑南溪整體平均變化量為-76 m，太麻里三角洲海岸為-71 m，誤差量遠小於台東數十年間的實際變化量。濱線擷取流程雖以台東海岸為例，方法上可做為日後全台數十年濱線變遷的參考。
此外，應用大比例尺地圖量測本島其他海岸濱線變遷時，應注意海岸特性的差異，在東部因潮差較小，地形坡度較陡，所以潮位造成的影響有限，相對而言風浪影響較顯著，選用圖像資料時要特別注意風浪的狀況，西部海岸要特別注意潮位所造成的影響。

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