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中文摘要：
利用边缘检测与主动轮廓模型组合的方法可提取海陆边界线，但易受轮廓跟踪的缺点的影响．在该方法的基础上，利用边缘检测与梯度矢量流的有向力作用生成初始轮廓线，再使用主动轮廓模型对初始轮廓线进行调整，得到精确的海陆边界．实验证明该方法可简便地生成有效的初始轮廓线并准确提取海陆边界，避免使用轮廓跟踪法．该方法可利用GIS数据辅助以简化提取流程．
英文摘要：
Active contour model combined with traditional edge detection can be used to extract land-sea boundary, but it is sensitive to shortcomings of boundary tracing. Based on the traditional method, edge detection and the di- rected force of gradient vector flow are used to generate the initial contour, then the active contour model is used to adjust the initial contour to the actual boundary precisely. According to the experiments, the new method can gener- ate the initial contour simply and extract land-sea boundary accurately without boundary tracing. What＇s more, the new method can be used to simplify the extraction process with GIS（Geographic Information System） assistance.
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