This paper presents a new method, in which nautical chart information can be compressed and restored by mathematical morphology technique.
用形态学方法对海图信息进行压缩和恢复，然后用游程编码对骨架进行编码和解码，达到用最少的空间存储最多的信息。
The digital information of electronic nautical chart used by this institute is realized by its system of the automatic generation of electronic nautical chart database.
该系统所用的电子航海图数字化资料以该所的电子航海图数据库自动生成系统完成。
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