The minimum degree of accuracy required for a particular survey and the range of the allowed degree of accuracy is known as order of accuracy. The most accurate work is designated as the work of the first order accuracy. The work of the second order accuracy is less accurate than that of the first order accuracy. Likewise, the work of the third order accuracy and the fourth order accuracy are less accurate than that of the second order and the third order accuracy, respectively.

For example, the following standard of accuracy may be expected for the horizontal distances for a particular survey.

First order accuracy 1/25,000

Second order accuracy 1/10,000

Third order accuracy 1/5,000

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