Find the origin position, latitude and longitude of Qingdao city coordinate system or the conversion method with national geodetic coordinate system. Thank you!

Qingdao local coordinate system adopts Beijing coordinate system 1954. In order to facilitate the use, the X and Y coordinates have been tampered with, with an increase of 389km and 200km respectively, mainly to reduce the projection deformation difference.

In GPS data processing, the offset of the central meridian is 200km, and the offset of the north-south direction is -389km.

The data obtained in this way reduces the number of digits in drawing.

In order to obtain data consistent with the national coordinate system, it is necessary to increase 300km in the east-west direction. Why? Because in the national coordinate system, in order to ensure that the coordinate values obtained are positive, they all moved 500km to the west, and now they have moved 200km, so in order to restore their true colors, they need to add another 300km. As for the north-south direction, add 389km.

Only after completing the plane of its national coordinate system can we continue the following work, such as the transformation with WGS84, Xi 'an 80 and other coordinate systems.