The number of omitted measurement may be one i.e., the length or bearing of any side of a traverse. The omitted element may be computed by using either of the Eq 31.1 or 31.2.

If the number of omitted measurements is two, the unknown elements may be computed using both the Eq 31.1 and Eq 31.2. But, when either both length and azimuth of the same side or lengths of any two sides (adjacent or non-adjacent) are omitted, their computation can be done easily adopting this same method.

But, if bearing of two adjacent sides or the length of one side and bearing of adjacent side are omitted then the above method for solution gets complicated. In these cases, trigonometric methods for solution better be applied to compute the omitted measurements conveniently. Example 31-1 provides a method of computation for omitted bearings of two sides and Example 31-2 for omitted the length of one side and bearing of other side.

Also, the omitted measurements may occur on sides that are not adjacent. In these cases, the sides of the traverse are shifted in parallel directions (thus departure and latitude of the sides get maintained) in such a way the sides having unknown elements are placed adjacent and then compute the unknown elements as outlined above. In Example 31-2 the length of one side and bearing of non- adjacent side are omitted. Before applying the method of solution for adjacent sides, the original traverse get reoriented and detail may be found in the solution of the example.

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