Triangulation classification
Triangulation classification the classifying of triangulations into first-order, second-order, and third-order triangulation, according to the error of closure of triangles in first-order work, the average closure is not in excess of 1 second, in second order work, it does not exceed 3 seconds, and in third-order work, it does not exceed 5 seconds for the basic first-order work, the computed length through the network must agree with the measured base within 1 part in 50 000, as a minimum, and average about 1 in 75 000, or
Source: http://www.iho.int/iho_pubs/standard/S-32/S-32-eng.pdf
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