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“大地原点”是大地座标的中心,是国家进行大地测量,用以推算地面各个控制测量点大地座标的起始点。建立准确的大地座标系才能正确表示地面上的山脉、河流、城市之间的相对位置。中华大地的基准点坐落在距西安市60公里的泾阳县境内。泾阳县属我国大陆中部,下面是数千米的黄土层。从地震记录来看,这里不易发生新的断裂和强震后的水平位移,而且远离大城市,空间观测效果好。国
The “earth origin” is the center of the earth’s coordinates. It is the country’s geodetic survey to calculate the starting point of the ground coordinates of each control measurement point on the ground. The establishment of an accurate earth coordinate system can correctly represent the relative positions of mountains, rivers, and cities on the ground. The reference point of the Chinese Land is located within the Shuyang County, 60 kilometers away from Xi’an. Puyang County is located in the middle of China’s mainland. The following is a few kilometers of loess layer. From the perspective of the earthquake records, it is not easy to generate new fractures and horizontal displacements after strong earthquakes, and it is far from the big cities. The space observation effect is good. country