Changes of the antenna models on permanent global navigation satellite system (GNSS) stations can lead to jumps and discontinuities in the coordinate time series. In this paper, the results of research on the adequacy of the antenna phase centre corrections (PCC) variations are presented by analysing its component—the antennas’ phase centre offset (PCO). For this purpose, height differences were determined using different and independent methods: EUREF Permanent Network (EPN) combined solutions, Precise Point Positioning (PPP), and the single baseline solution. The results of GNSS processing were referenced to direct geometric levelling outputs. The research was conducted only within the global positioning system (GPS) system due to the compatibility of one of the receivers, and the experiment was based on a comparison of the height differences between four GNSS antennas located on the roof of a building: two permanent station antennas and two auxiliary points. The antennas were located at similar heights; precise height differences were determined by geometric levelling, both at the beginning and the end of the session. Post-processing was conducted with the use of the GPS system, precise ephemeris, the adopted antenna correction model, and a zero-elevation mask. For one of the antennas, a change of the antenna characteristic model from IGS08 to IGS14 leads to an 8-mm difference in height. Older antennas used in the national (or transnational) permanent network need individual PCC.

The analysis covered the city bike rental system in Lublin and the development of the so-called Lublin City Bike (LRM) network. The LRM network was chosen due to its dynamic development, because Lublin has the most city bikes per capita in Poland. LRM was launched in June 2014. Since then, the Lublin City Bike consists of 951 bikes located in 97 rental stations in Lublin and Świdnik. The purpose of the present work is to analyse the development of city bike docking stations in Lublin against the background of economic and spatial conditions of the city. The analyses were performed using GIS software. The greatest interest in LRM was recorded in the central part of the city. It has been shown that the development of cycling infrastructure does not have a significant impact on the spatial coverage of Lublin City Bike. Developments planned until 2022 will also not significantly affect the extension of LRM coverage, as they are focused on increasing the density of stations. Furthermore, the location of the LRM stations is not related to the population density in individual city districts.

Currently, in Poland, the State Spatial Reference System (SSRS) includes two height reference frames: PL-KRON86-NH and PL-EVRF2007-NH as the Polish implementation of the European Vertical Reference System (EVRF). The deadline for EVRF2007 implementation in Poland, as the only legally permitted height frame, is set at the end of 2023. Because of the administrative division, the implementation was planned in two stages: at the state level (government) and the local level (districts). In the article, the local ones are reviewed, especially regarding the aim of height conversion methods, costs and their progress. As a background, a historical perspective of height systems and frames used in Poland since the beginning of the 20th century is provided. The source of data was the Head Office of Geodesy and Cartography (HOGC), as well as the district surveying departments’ official answers; open documents posted on the Internet, e.g. tender documentation and their results were also analysed.