How important was the ancient land? With the ancient technical level, how did they draw accurate land?

Nowadays, when you are away from home, you can get it on your mobile phone and use various map mobile phone software to accurately locate it. Many cars also have built-in electronic navigation bars, but there were no such items in ancient times, and most of them only used maps. So how did they make accurate maps with their own technical strength in ancient times? Today's interesting history, I'll take you to understand it.

Now the use value of the map itself is not high. You can download different kinds of maps from all over the world on the Internet at will, but in ancient times, the map itself was very crucial and valuable. When Jing Ke stabbed the king of Qin, he hid the dagger in the map. And can't hide from the soldiers' inspection in the past, of course, because at that time, the map of a country has a unique practical significance, which means the general control category of a country and the information content of some battlefields inside it, which is undoubtedly very beneficial to the war.

The necessity of maps should be clear to everyone, so how did the ancients make maps with the level of science and technology at that time? There are different ways around the world about this, but they should change in the same way. No matter how to make a map, it is inseparable from accurate measurement. Of course, the initial accurate measurement depends on manpower. Huangdi, one of the ancestors of China, traveled hundreds of thousands of miles to better measure the land.

In the Yan emperor stage, in order to better manage, we must master some landforms, so maps are essential. Therefore, he also sent people to make accurate measurements with standards, ropes and regulations, and make concise maps. But this method is not only laborious, but also inefficient. After all, people's feet are too low. So in the Han dynasty, people used carriages instead of manpower. This kind of carriage is naturally special, divided into two floors. Because of the internal tenon transmission system, the top floor will ring drums every other mile and bells every ten miles. At this point, a person can accurately measure at a long distance by assuming the frequency described, which is considered as "having a drum in his heart."

This measurement method has been used for a long time. Although it has been improving continuously, there is no big change on the whole. Until the Western Jin Dynasty, a man named Pei Xiu appeared. Pei Xiu not only explicitly put forward the method of "six-body mapping", but also personally completed the "Gong Yu Regional Map", which can be regarded as an early atlas of China. "Painting six bodies" are point, quasi-hope, Daoli District, victory or defeat, square evil and straightforwardness. This is actually the calculation of scale accuracy, orientation, spacing, absolute height, inclination, quantity and spacing. This sign, which often appears on today's maps, can be said to be close to contemporary maps, so it is called "the originator of cartography in China".

Little did they know that with the closed door of Qing Dynasty, China's technical strength was lost by western countries, and the layout of traditional maps did not take into account the globe. It was not until some technologies from western countries penetrated into China that this problem was changed, even though it could not conceal the wisdom of the ancients in these aspects.