The number of observations required for each angle.
A check in each figure between the two values computed for the go forward line as obtained
through the two strongest routes.
A final check in the agreement between the computed length and the measured length of the
base or the adjusted length of the check line (if the standards of accuracy have been adhered
to).
a. To ensure that the desired accuracy is maintained and accidental errors are kept within the
prescribed limits throughout the triangulation, give careful consideration to the capabilities and
limitations of the surveying instruments and the accepted methods of observing. Under certain
conditions, it is possible for the allowable error in the length of a line to be exceeded even when the
triangulation meets the other specifications for that particular order of control. This may be caused by
errors due to compensation to meet other specifications or by accumulative errors in which all the
angular errors, although within the specified maximum allowed, are mostly of the same sign.
b. In the process of adjusting the final observations by the method of least squares, the results are
consistent throughout; but all the errors cannot be removed. If the observational errors are small and
indiscriminately plus and minus, then the adjustment will probably distribute them so that there is only a
slight accumulation of errors. However, blunders, large accidental errors, and systematic errors of
varying signs cannot be distributed correctly by the adjustment process; therefore, exercise great care in
doing everything possible to avoid them.
PART L - SURVEY RECONNAISANCE
2-38. General. The reconnaissance party must consider special factors as determined by the objective
of the survey and the methods, techniques, and equipment that will be employed.
The proper gathering of all existing survey data in reference to the target area.
The proper testing and determination of the usability and visibility of existing stations.
The selection of sites for the main and supplemental stations.
The determination of monumental requirements.
EN0593
2-22
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