  44325 measured and assigned transitions of H$_2^{32}$S, the parent
isotopologue of the hydrogen sulfide molecule, are collated from 33
publications into a single database and reviewed critically. Based on this
information, rotation-vibration energy levels are determined for the ground
electronic state using the Measured Active Rotational-Vibrational Energy Levels
(MARVEL) technique. The ortho and para principal components of the measured
spectroscopic network of H$_2^{32}$S are considered separately. The verified
set of 25293 ortho- and 18778 para- H$_2^{32}$S transitions determine 3969
ortho and 3467 para energy levels. The Marvel results are compared with
alternative data compilations, including a theoretical variational linelist.
