|Coverage||Global (90N-90S, 0-360E)|
|Time Period||January 1979 - Present|
|Resolution||2.5 x 2.5 degree, monthly|
Several climate rainfall products, which merge rainfall estimates from a variety of satellite and ground-based sources are currently available going back to January of 1979 and continuing through the present. While the combination of data from these multiple sensors/sources provides long-term climate rainfall datasets suitable for climate studies, there are a number of issues affecting their use for some climate applications. These include discontinuities in the component data sets, differences in the calibration methods, and the methodology used to weight the individual rain estimates.
The current version is version 2.
The GPCP dataset merges satellite and rain gauge data from a number of satellite sources including GPI, OPI, SSM/I emission, SSM/I scattering, and TOVS. In addition, rain gauge data from GHCN+CAMS and GPCC are used over land. Details on the component datasets as well as the method used to merge these data are provided by Huffman et al.  and Adler et al. .
The GPCP dataset as well as the intermediate GPCP datasets are available through either of the following sources.