ellipsoid and lat separation

Slide 1: 

BM1 TBM2 BM3 Zero gauge level 1.10 0.26 MSL= 1.2 m LAT=0.00 m HAT= 2.2m TBM2 level HAT,LAT &MSL computed by the s/w is for the location of the sea surface at a particular location, now if the zero gauge exactly aligned with the end of the rod pole and its length is measured to be 4m downward from TBM2 then we can calculate the following heights value for TBM2: LAT=3.80m, MSL=2.8m and HAT= 2.2 m If TBM2 observed by dual frequency GPS receiver for several hours, simultaneously holding BM3 fix in in a network adjustment, and we Computed ellipsoidal height for TBM2 as -31.75m from a Geoid model Program we calculated Geoid separation to be -32.956m. All we knew N=h-H, then H=h-N , therefore MSL height at TBM2 = -32.750- (-32.956)= 1.20m. We also knew the difference between LAT and MSL at TBM2 is about 1.20m, that means LAT would be a reference height with a value of almost 1.2-1.20 = 0.00 m 1.20m = -32.950 m -31.750 m =1.20 m TBM2 1.49 2.05