What is the symbol of the final completion of the measured map of China?

It was incorporated into the Map of Gan Long Neifu, which marked the final completion of the measured map of China. Development and application of modern maps? Many technical factors have promoted the development of modern cartography: photography and image correction technology, and the combination of photography and printing. This map is the first nationwide survey map in China and the first latitude and longitude survey map in China. It marks the transformation from the traditional and ancient planning drawing method in China to the modern latitude and longitude network drawing method.

The Panorama of Imperial Earth, which was completed in the fifty-sixth year of Emperor Kangxi in Qing Dynasty, is the first map drawn by scientific methods after large-scale measurement in China.