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Elevation from GTS Station

Question asked by prabakaran alg on Oct 26, 2018

Hi am from india , I have a GTS Station level value that is 1.700m, the GTS Point was taken 55 years before , and i was taken same point by using R8s - 5 hrs observation and am processed Trimble RTX online method i got a elevation value is 1.891m . the difference is 19 cm .




why this difference is happen??