Surveying services in the drainage network (framework agreement)

On behalf of the Kommunalbetrieb Krefeld AöR, the situation of individual public authorities

to measure sewer pipes and sewer structures throughout the city of Krefeld. To

measuring is part of the European Terrestrial Reference System - German Reference Network

ETRS/DREF91 realization 2016 and the height above normal height zero (NHN) in the

German main height network 2016 (DHHN2016).