Where is the origin of Shanghai city coordinates?

Walking near the People's Square, our friend led us into the Shanghai International Hotel and found that the birthplace of Shanghai was here. Taking the flagpole on the roof of the international hotel as the origin, the plane coordinate system of Shanghai is established, that is to say, the center of Shanghai is the international hotel. Shanghai International Hotel is a famous work of Hungarian designer Hudac in Shanghai. 1931* * The 24-story international hotel was called "the tallest building in the Far East" in 1930s, and was jointly invested and built by the four major banks at that time. It is the first skyscraper built by China people themselves and the most advanced hotel in Asia in 1930s. At that time, the front of the hotel was facing the Happy Valley Hall, and the huanghe road next to it was called "Park Road", so the mbth of the international hotel was called "Park Hotel", which adopted the latest steel frame structure and reinforced concrete floor in the world at that time. It was a replica of American skyscrapers at that time and once became the tallest building in the Far East at that time. Shanghai International Hotel is also the first time that Hudac has used modernist style in a complete sense, which can be said to be a milestone in the transformation of western-style architecture to modernism in the architectural history of China. -This landmark building was once called "Modern Decorative Art School" by academic circles. Until the 1960s, the International Hotel maintained the record of "the tallest building in the Far East" and "the tallest building in East Asia", and it has been the highest point in Shanghai for more than 50 years. If you have been to international hotels, you will definitely notice a Shanghai model with international hotels as the "zero" point. Then, you will understand how important international hotels are in Shanghai! Yes, the International Hotel is the zero center of Shanghai. An era will naturally have the pride of an era. -"The tallest building in the Far East" was once a symbol of Shanghai. 1933, young I.M. Pei passed by the hotel and felt a sense of pride. Before completing the course of St. John's University, he embarked on the road of studying architecture in the United States and eventually became a famous international architect. It is said that international hotels in history are places where celebrities gather. 1949 years ago, Song Meiling, Zhang Xueliang and Chennault were frequent visitors here. 1949, Chen Yi, then mayor, received the PLA officers and men at or above the army level in the hotel. 1959, Guo Moruo climbed onto the roof of the hotel and wrote two poems happily. Many famous scholars have left poems, books and paintings for the hotel, which have become the treasures handed down from generation to generation.