Linkage of Normal Heights Obtained from GNSS and Refined XGM2019 GGM to Brazilian Vertical Data Using Different Approaches

This work aimed to analyze the use of different approaches link normal heights obtained via Global Navigation Satellite System (GNSS)/Global Geopotential Model (GGM) refined by RTM technique Brazilian Vertical Data (Imbituba Datum – IBVD and Santana SBVD). Specifically, it analyzed based on weighted mean discrepancies between height anomalies, zero- level geopotential value, Geodetic Boundary Value Problem (GBVP) solution, parametric modeling a plane with scale factor. For numerical tests, two study regions have been used, first referenced second SBVD. Using three approaches, local idea has investigated in both regions. In this context, spatial cluster analysis outliers differences global anomalies defined sub-regions. fourth approach, treatment was initially considered. accuracy linkages, verified that using value propose practically same results. On other hand, there were improvements at centimeter GBPV solution-based approach compared two, except for worsening cases. With modeling, results mainly worse considering modeling. The most significant reached decimeter level.