surveying iii (topographic and geodetic surveys) - Modern Prepper

Table 5-5. Point-Closure Standards for Horizontal- and Vertical-ControlSurveys5-54. Final-Adjustment Reports. A variety of free- or constrained adjustment combinations may bespecified for a GPS-S. Specific stations may be held fixed or a contractor may be instructed todetermine the optimum adjustment, including the appropriate weighting for constrained points. Whenfixed stations are to be partially constrained, appropriate statistical information must be provided. Eithervariance-covariance matrixes or relative positional accuracy estimates may be converted as approximatevariance-covariance matrixes in the constrained adjustment. All rejected observations should be clearlyindicated, along with the criteria and the reason used for the rejection.a. When different combinations of constrained adjustments are performed due to indications of oneor more fixed stations causing undue biasing of the data, an analysis should be made as to arecommended solution that provides the best fit for the network. Any fixed control points requiringreadjustment should be clearly indicated in the final recommendation.b. The final, adjusted horizontal- or vertical-coordinate values are assigned an accuracyclassification based on the statistical results. This classification should include both the resultantgeodetic or Cartesian coordinates and the baseline-differential results. The final, adjusted coordinatesshall state the 95 percent confidence region of each point and the accuracy in the part(s) per millionbetween all points in the network. The datum should be clearly identified for all coordinate listings.c. Final-report coordinate listings may be required on hard copy as well as on a specified computermedia. A scaled plot should be submitted with the adjustment report showing the proper locations anddesignations of all established stations.5-51 EN0593