The paper introduced the key technology of making thematic map symbols library that servered for Ming Great Wall resource investigation of Gansu.
介绍了甘肃省境内明长城专题地图符号的制作方法，对长城影像地图专题符号制作的关键技术进行探讨和研究；
The paper introduced the key technology of making thematic map symbols library that servered for Ming Great Wall resource investigation of Gansu.
介绍了甘肃省境内明长城专题地图符号的制作方法，对长城影像地图专题符号制作的关键技术进行探讨和研究；
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