The average height of the Ming Great Wall is about 667m, and its average slope is 27 degree.
北京明长城的平均高度为667米，平均坡度为27°。
参考来源 - 北京明长城分布现状及其损毁保护的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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；
Made of rammed earth and rubble, these fortifications became the basis for the Great Wall, most of which would be rebuilt in stone and brick during the 15th century A.D. under the Ming dynasty.
这些由夯土和瓦砾修筑的堡垒成了长城的基础。长城中的大部分用砖石砌成，在十五世纪的时候由明朝修建。
While the latest construction occurred after 1368 during the Ming Dynasty, construction of the Great Wall began over 2, 000 years ago.
长城的建造始于2000年前，止于1368年的明朝时期。
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