In addition to proving the presence and influence of lateral refraction, thist time we also look at the redundancy of mesaurments. At the begining the tunnel is briefly decribed. Then we explained lateral refraction teoretical, and we also described meteorological resaults. We also provide 3 equation that can be used to calculate refraction angels. The information that was previosly given in thesis is briefly repeated(field work, measurement method and data processing. Then there are sketches of all variants of the polygons that we imagine in this thesis. We made network adjustments separately for all variants of the polygons, for morning and afternoon measurements. The results are shown numerically and graphically. After analyzing the results, we finally presented the findings and suggested what would be the best version of a polygon or geodetic network. The results showed that the geodetic network would be the most suitable variant, as it has the smallest error at the final point 13 and has redundancy of mesauraments within recomended range. The chains were also good approximation, as they also have good redundancy of mesaurments, and small error. Polygons are not recomended, even if they have small error,they have low redundancy of mesaurments.
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