  Gravimetry is a versatile metrological approach in geophysics to accurately
map subterranean mass and density anomalies. There is a broad diversification
regarding the working principle of gravimeters, wherein atomic gravimeters are
one of the most technologically progressive class of gravimeters which can
monitor gravity at an absolute scale with a high-repetition without exhibiting
drift. Despite the apparent utility for geophysical surveys, atomic gravimeters
are (currently) laboratory-bound devices due to the vexatious task of
transportation. Here, we demonstrated the utility of an atomic gravimeter
on-site during a gravity survey, where the issue of immobility was circumvented
with a relative spring gravimeter. The atomic gravimeter served as a means to
map the relative data from the spring gravimeter to an absolute measurement
with an effective precision of 7.7$\mu$Gal. Absolute measurements provide a
robust and feasible method to define and control gravity data taken at
different sites, or a later date, which is critical to analyze underground
geological units, in particular when it is combined with other geophysical
approaches.
