Question 3 (10 %): Figure 1 shows a small level net in which BM is a benchmark with known elevation 0.00 m. The following differences in elevation (AElev.) are observed using a direct leveling procedure. The observations have weights as they are given in the 3rd row in Table 1. Assuming that all observations are uncorrelated, use Least Square criterion to (1) calculate the values for the elevations of A, B, and C. (2) Show the residuals and the adjusted observations (AElev.). Table 1: Observations and weights of Level Network Line 1 2 2 3 4 5 AElev. (m) 10.28 21.87 12.30 5.07 6.98 9 9 9 9 1 BM = 0.00 m 2 Figure 1: A Level net Question 3 (10 %): Figure 1 shows a small level net in which BM is a benchmark with known elevation 0.00 m. The following differences in elevation (AElev.) are observed using a direct leveling procedure. The observations have weights as they are given in the 3rd row in Table 1. Assuming that all observations are uncorrelated, use Least Square criterion to (1) calculate the values for the elevations of A, B, and C. (2) Show the residuals and the adjusted observations (AElev.). Table 1: Observations and weights of Level Network Line 1 2 2 3 4 5 AElev. (m) 10.28 21.87 12.30 5.07 6.98 9 9 9 9 1 BM = 0.00 m 2 Figure 1: A Level net