High-precision geometric levelling of routes for Bizkaia’s NAP network

Summary

The Provincial Council of Bizkaia is procuring high-precision geometric levelling fieldwork on five routes to extend and densify the Bizkaia NAP geodetic network. Lot 1 covers lines 3 and 4, measuring 9.80 km and 10.20 km; Lot 2 covers lines 1, 2 and 5, measuring 13.30 km, 9.30 km and 7.40 km. The work includes installing new levelling marks and observing them using GNSS, followed by forward-and-return levelling; determining final orthometric heights is not part of the contract.