1: 1000 What projection is commonly used in the standard framework?

Generally, Gaussian projection is used, and the standard frame of 1: 1000 is generally Gaussian projection. Gauss-Kruger projection was drawn up by German mathematician, physicist and astronomer Gauss in the 1920s of 19, and then the projection formula was supplemented by German geodetic scientist Kruger in 19 12. Therefore,

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