Confirm all measurements pass the local test at the 95% confidence level (see Section 5.1) in the minimally constrained adjustment. When propagating datum and uncertainty from the NGRS or including a survey within the NGRS, undertake a fully constrained adjustment using appropriate constraints, and: Confirm the sigma-zero value obtained from the global test is within the upper and lower limits of the 95% confidence interval Using the local test, confirm the measurements still satisfy the expected measurement uncertainties at the 95% confidence level As required, evaluate the standard deviations, error ellipses, PU and RU at the 95% confidence level for all survey control marks. Example: GNSS and terrestrial control survey Figure 1 shows a small, high precision General Purpose Control Survey comprised of GNSS and terrestrial (horizontal angle, vertical angle, slope distance and differential levelling) measurements. The purpose of the survey is to establish four new marks from two NGRS marks – one survey control mark and one GNSS CORS site. The list of survey control marks and coordinates is shown in Table 1, and the full set of measurements is shown in Table 2 and Table 3. Note that this example is intended to demonstrate a rigorous adjustment and does not promote or infer optimal network design. Figure 1: Combined GNSS and terrestrial control survey All GNSS baseline measurements and uncertainties are based upon a two-hour observation period and have been extracted directly from baseline processing software. Each horizontal angle has been reduced from a set of three angle measurements. Table 1: Station information Station Latitude Longitude AHD Height Remarks 21 -35 58 47.9104 142 54 36.5764 103.70 New mark 22 -35 58 49.3103 142 54 48.7007 104.20 New mark 23 -35 58 51.1635 142 55 04.9083 104.10 NGRS mark 24 -35 58 59.3499 142 54 34.6041 103.60 New mark 25 -35 59 03.0961 142 55 02.7909 102.80 New mark 26 -35 59 07.6206 142 54 46.2107 112.897 NGRS GNSS CORS site Table 2: Terrestrial measurement information Measurement Mark 1 Mark 2 Mark 3 Value Std. dev. Inst. ht. Targ. ht.
Confirm all measurements pass the local test at the 95% confidence level (see Section 5.1) in the minimally constrained adjustment. When propagating datum and uncertainty from the NGRS or including a survey within the NGRS, undertake a fully constrained adjustment using appropriate constraints, and: Confirm the sigma-zero value obtained from the global test is within the upper and lower limits of the 95% confidence interval Using the local test, confirm the measurements still satisfy the expected measurement uncertainties at the 95% confidence level As required, evaluate the standard deviations, error ellipses, PU and RU at the 95% confidence level for all survey control marks. Example: GNSS and terrestrial control survey Figure 1 shows a small, high precision General Purpose Control Survey comprised of GNSS and terrestrial (horizontal angle, vertical angle, slope distance and differential levelling) measurements. The purpose of the survey is to establish four new marks from two NGRS marks – one survey control mark and one GNSS CORS site. The list of survey control marks and coordinates is shown in Table 1, and the full set of measurements is shown in Table 2 and Table 3. Note that this example is intended to demonstrate a rigorous adjustment and does not promote or infer optimal network design. Figure 1: Combined GNSS and terrestrial control survey All GNSS baseline measurements and uncertainties are based upon a two-hour observation period and have been extracted directly from baseline processing software. Each horizontal angle has been reduced from a set of three angle measurements. Table 1: Station information Station Latitude Longitude AHD Height Remarks 21 -35 58 47.9104 142 54 36.5764 103.70 New mark 22 -35 58 49.3103 142 54 48.7007 104.20 New mark 23 -35 58 51.1635 142 55 04.9083 104.10 NGRS mark 24 -35 58 59.3499 142 54 34.6041 103.60 New mark 25 -35 59 03.0961 142 55 02.7909 102.80 New mark 26 -35 59 07.6206 142 54 46.2107 112.897 NGRS GNSS CORS site Table 2: Terrestrial measurement information Measurement Mark 1 Mark 2 Mark 3 Value Std. dev. Inst. ht. Targ. ht.
Guideline-for-Adjustment-and-Evaluation-of-Survey-Control_v2.1_0.docx