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The ancients used rulers (drawing circles), moments (rulers) and compasses to draw maps, crossing mountains and rivers and forming maps one by one.
Information about the compass is extracted as follows.
Compass, also known as compass, is an essential instrument for feng shui operation. It has gone through a long historical process from invention to gradual perfection. According to Wang Daoheng's preface to Detailed Explanation of Compass: "Guangdong's compass system was founded by Xuan Di, and Duke Zhou followed its laws and determined the compass orientation. But there are only twelve gods in nature, which are divided into eight dry and four dimensions, including Luo, which is called site. Yang and Lai Jia have two floors, namely, He Sancai. " It can be seen that as early as the Tang and Song Dynasties, the three needles of the compass (straight needle, middle needle and sewing needle) were basically established. After the Northern Song Dynasty, with the perfection of geomantic theory, geomantic omen became popular in China. At this time, some feudal literati also joined in, writing books and saying things in succession, and then adding a compass layer unconventional. By the end of the Qing Dynasty, a 40-storey geomantic compass was formed, covering everything. Through latitude and longitude, we can distinguish the good and bad directions of mountains and rivers, decide the fate of the world and make full use of everything.
In the Qin Dynasty, our ancestors built "Qinqu", "Lingqu" and "Jiangnan Canal" all by rules, manners and regulations, and our ancestors crossed mountains and rivers.