The Berkeley Earth Surface Temperatures (BEST) are a set of data products, originally a gridded reconstruction of land surface air temperature records spanning 1701-present, and now including an 1850-present merged land-ocean data set that combines the land analysis with an interpolated version of HadSST3. The land station data are available in an archive, and an experimental version provides daily data for 1860-present. The Berkeley Earth project was intended to provide an alternative, independent assessment of global temperature change, separate from the analyses of the USA's NOAA and NASA, and the UK's CRU/Hadley Centre. In contrast to other data sets incorporating records from roughly 5000-7000 land stations, the Berkeley data set incorporates approximately 37,000 records. This is in part due to the use of additional data bases beyond GHCN, and in part to the methodology, which allows short, fragmented timeseries to be incorporated into the statistical model.
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National Center for Atmospheric Research Staff (Eds). Last modified 29 Oct 2015. "The Climate Data Guide: Global surface temperatures: BEST: Berkeley Earth Surface Temperatures." Retrieved from https://climatedataguide.ucar.edu/climate-data/global-surface-temperatures-best-berkeley-earth-surface-temperatures.