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This paper investigates the potential of Global Navigation Satellite System (GNSS) technology for monitoring vertical displacements in areas affected by underground mining and evaluates its combination with precise geometric leveling. The study is based on repeated measurements carried out in the Stonava locality (Czech Republic), where intensive deep coal mining induces significant surface subsidence reaching up to several decimeters per year. The main objective is to assess the accuracy of GNSS-derived heights, ...