Table 8: Comparison of geoid referenced heights to LSD heights LSD Difference Difference Height Height Height(m) from from Point ID (CARIB97) (EGM2008) (established CARIB97 EGM2008 (m) (m) before height(m) height(m) 2012) 11.349 12.895 -1.617 -1.546 BM20 11.278 7.419 9.600 -2.11 -2.181 BM26 7.490 Notable differences are seen between geoid referenced heights and the existing value given by LSD with a maximum observed difference of 2.2 m. Comparison of Geoidal Model and Tidal heights Heights of A1991 and BM1202, established using GNSS data and tides were compared to inform the quality of the CARIB97 and EGM08 geoidal model. Table 9 shows the comparison of heights. Table 9: Comparison of GNSS derived heights and tidally referenced heights Height Height Difference Difference Difference in Height above above between between CARIB97 and above Benchmark geoid geoid MSL and MSL and EGM2008 MSL (CARIB (EGM08) CARIB97 EGM Height(m) (m) 97) (m) (m) (m) 2008(m) A1991 1.887 1.932 -0.045 1.786 -0.101 -0.146 (Charlotteville) BM1202 1.450 1.466 -0.016 1.165 -0.285 -0.301 (Scarborough) Pigeon 03 1.063 1.036 0.027 1.415 0.352 0.379 (Pigeon Point) 4.942 4.926 -0.016 4.641 -0.285 -0.301 (LSD) (LSD) MOWT mark (Scarborough) 4.944 -0.303 (IMA) (IMA)
Table 8: Comparison of geoid referenced heights to LSD heights Point ID Height (CARIB97) (m) Height (EGM2008) (m) LSD Height(m) (established before 2012) Difference from CARIB97 height(m) Difference from EGM2008 height(m) BM20 11.278 11.349 12.895 -1.617 -1.546 BM26 7.490 7.419 9.600 -2.11 -2.181 Notable differences are seen between geoid referenced heights and the existing value given by LSD with a maximum observed difference of 2.2 m. Comparison of Geoidal Model and Tidal heights Heights of A1991 and BM1202, established using GNSS data and tides were compared to inform the quality of the CARIB97 and EGM08 geoidal model. Table 9 shows the comparison of heights. Table 9: Comparison of GNSS derived heights and tidally referenced heights Benchmark Height above geoid (CARIB 97) (m) Height above geoid (EGM08) (m) Difference in CARIB97 and EGM2008 Height(m) Height above MSL (m) Difference between MSL and CARIB97 (m) Difference between MSL and EGM 2008(m) A1991 (Charlotteville) 1.887 1.932 -0.045 1.786 -0.101 -0.146 BM1202 (Scarborough) 1.450 1.466 -0.016 1.165 -0.285 -0.301 Pigeon 03 (Pigeon Point) 1.063 1.036 0.027 1.415 0.352 0.379 MOWT mark (Scarborough) 4.926 4.942 (LSD) -0.016 4.641 -0.285 -0.301 (LSD) 4.944 (IMA) -0.303 (IMA)
Final_Report_Benchmark_Project_ERPGEO11001.docx