1) Adjust the network shown below by the method of least squares. (10 pts.) B Course Distance (m) BC 1320.027 0.023 CD 1579.169 0.023 DA 1664.497 0.023 AC 2105.995 0.023 AB 1640.033 0.023 Angle BAC 38 48 52.5" 2.2" CBA 90-02 25.5" 3.1" DCA 51 18 21.9" 2.3" CAD 47 46 13.1"3 2.3" ACB | 51 08 53.2"' 2.6" The coordinates (m) for control station A is x = 4356.78, y = 2340.97. The azimuth of line AB is Az,=0' 06' 23.7" with a standard deviation of 1". a) What is the reference standard deviation, S,? b) List the adjusted coordinates of the unknown stations and their standard deviations. Data Modeling and Estimation c) Tabulate the adjusted observations, their residuals and their standard deviations. d) Compare your results with the ones which you obtained both in the Assignment-VI and in the Assignment-VII and comment on them