| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for extracting the digital data of a shoreline easily and accurately. <P>SOLUTION: When an aerial photograph image is read in a step S301, edges are extracted in a step S305. In a step S308, the extracted edges are vectorized and vector data for forming the shoreline are extracted. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
