【摘要】 对影响自动数字化效率较大的两种地图符号———冲沟和陡崖进行了分析研究,提出了一种旋转式内跟踪方法对它们进行自动提取.用分版等高线图进行的实验结果表明,该方法大大提高了冲沟和陡崖数字化的效率和准确性.该方法已应用于1∶50 000地图数字化生产中.更多还原

【Abstract】 In GIS geospatial data acquisition,there are many map scanning digitizing systems in which automatic tracking method is used for digitizing contour lines.The performance is,however,far from satisfactory because a great deal of editing is involved.In this paper,we analyze two map symbols: the gully and the cliff,which greatly affect the efficiency of automatic digitization,and propose a new method called revolving inner tracking for extracting gullies and cliffs from separated contour images.Experimental results show that the proposed method has greatly improved the efficiency and the accuracy of digitizing the two symbols.The method has been successfully applied to 1∶(50 000) scale map digitizing production.更多还原