  Long and consistent sunspot area records are important for understanding the
long-term solar activity and variability. Multiple observatories around the
globe have regularly recorded sunspot areas, but such individual records only
cover restricted periods of time. Furthermore, there are also systematic
differences between them, so that these records need to be cross-calibrated
before they can be reliably used for further studies. We produce a
cross-calibrated and homogeneous record of total daily sunspot areas, both
projected and corrected, covering the period between 1874 and 2019. A catalogue
of calibrated individual group areas is also generated for the same period. We
have compared the data from nine archives: Royal Greenwich Observatory (RGO),
Kislovodsk, Pulkovo, Debrecen, Kodaikanal, Solar Optical Observing Network
(SOON), Rome, Catania, and Yunnan Observatories, covering the period between
1874 and 2019. Mutual comparisons of the individual records have been employed
to produce homogeneous and inter-calibrated records of daily projected and
corrected areas. As in earlier studies, the basis of the composite is formed by
the data from RGO. After 1976, the only datasets used are those from
Kislovodsk, Pulkovo and Debrecen observatories. This choice was made based on
the temporal coverage and the quality of the data. In contrast to the SOON data
used in previous area composites for the post-RGO period, the properties of the
data from Kislovodsk and Pulkovo are very similar to those from the RGO series.
They also directly overlap the RGO data in time, which makes their
cross-calibration with RGO much more reliable. We have also computed and
provide the daily Photometric Sunspot Index (PSI) widely used, e.g., in
empirical reconstructions of solar irradiance.
