Estimating Polish vertical datum offsets using GNSS/levelling benchmarks information and global geopotential models
21/09/2016 | 17:00 | Session 5: Height systems and vertical datum unification
Author(s): Joanna Kuczynska-Siehien and Adam Lyszkowicz
Joanna Kuczynska-Siehien and Adam Lyszkowicz
IAG Resolution (No. 1) for the definition and realization of an International Height Reference System (IHRS) adopted in Prague IUGG 2015 General Assembly, accepted the value 62635853.4 m2s-2 as the realization of a potential value of the vertical reference level for the IHRS. The aim of this study is to determine a new and better geopotential difference W between the potential of the local vertical reference level in Poland and the W0 value accepted in Prague. The computation is based on the use of normal heights, GNSS measurements over a network of points connected to the national levelling network and high-accuracy Global Geopotential Models (GGM). The recent geodetic gravity field satellite missions GRACE (Gravity Recovery and Climate Experiment) and GOCE (Gravity field and steady-state Ocean Circulation Explorer) have significantly improved global gravity field models and in combination with the EGM2008 model we expected more reliable results.