In the master thesis we selected a certain number of benchmarks of the city leveling network and benchmarks of the state leveling network (new 1st order) for the needs of quality control of the new height reference surface on the area of Ljubljana distributed over the area so that they form approximately a cell network of size 1 x 1 kilometer. On these benchmarks, we determined the values of geoid heights with a combination of RTK-GNSS measurements and geometric leveling. These were compared with the interpolated values from the official model of the height reference surface. We also made a comparison with the heights of these points in the old vertical system SVS2000 and the old model of the geoid SLO_AMG2000. We presented the theoretical basis for quality control of the height reference surface, the selection process of appropriate benchmarks and graphically and numerically analyzed the obtained results. We presented the differences between the measured and interpolated geoid heights from the new geoid model (SLO_VRP2016 / Koper) for the considered area of Ljubljana and interpreted them. The results of the comparison on the new height reference surface SLO_VRP2016 / Koper showed that in the considered area of Ljubljana the average differences of geoid heights are -1.6 cm. 56 measured benchmarks were included in this calculation. The maximum value of the difference in geoid heights is 4.0 cm on the benchmark 22/2, and the minimum value is 9.1 cm on the benchmark 40/23. We found that SLO_VRP2016 / Koper matches well with the values of geoid heights, which are determined by measurements.
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