The seventh year of Fuchang, pseudo-Qi Qi, was engraved in 1136 AD:
The stone carved in the Southern Song Dynasty
The stone carved in the Yu Trace in the Southern Song Dynasty
The stone carved in the Yu Trace in the world was called "the most outstanding map work in the world at that time" by the Western sinologist Joseph Needham. It is one of the earliest stone carved maps in China. There are two stone carvings in the existing "Yu Trace Picture": one is preserved in the Stele Forest Museum in Xi'an, Shaanxi, and was carved in the seventh year of Fuchang (1136) of the Liu Yu regime in the Southern Song Dynasty; the other is carved in the Jiaoshan Stele Forest in Zhenjiang, Jiangsu, and is carved in the 12th year of Shaoxing (1142) of the Southern Song Dynasty. The two stone carvings are basically the same, the contents of scale . The stone carving map of Xi'an's "Yu Ji Tu" was originally placed in the county school of Qishan County, Fengxiang Prefecture, and was engraved on the opposite side of the same stone tablet of "Huayi Map". The picture is about 80.5 cm long and 78.5 cm wide, depicting a panoramic view of China during the Song Dynasty. The box on the picture is titled: "Yu Trace Picture, each with a hundred miles of land, the name of Yu Gong mountains and rivers, the names of ancient and modern prefectures and counties, the names of ancient and modern landscapes, and the carved stones in April of the seventh year of Fuchang." The name of the picture, scale, map content and time are indicated, which is equivalent to the current "editor's description".
"Yujitu" is basically square, with the direction north as the upper, and the direction is up north and down south, which is consistent with modern maps. The drawing method of "drawing square in the plot" is 71 horizontally and 73 vertically. There are 5,113 squares with a side length of 1 cm in the picture. Each square folds a hundred miles of land, which is equivalent to 1:5 million. The location, direction and coastal contour of the river in the picture are very close to the modern actual map.
"Jili Drawing Square" is a traditional drawing method in ancient Chinese map drawing. It is to draw a grid net on the map according to a certain proportional relationship, and use it to control the orientation and distance of each element on the map. The principle of drawing is to regard the ground surface as a plane, and control various elements on the ground surface using the grid grid, and shrink them onto the map plane at a certain proportion (such as "a hundred miles folded in each square", "a square cover of ten miles", etc.). Hu Bangbo from the Institute of Natural Sciences, Chinese Academy of Sciences believes: "It (Jili Painting Square) has the properties of directional projection and scale-down. The distance between objects in various places is a horizontal straight line distance, which is in line with the six principles of mapping proposed by Pei Xiu, an outstanding mapologist in the Western Jin Dynasty - ' Mapping Six-body '" "This traditional mapping method of ancient Chinese mapology occupies an important position in the history of the development of world mapology."
