|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 0802.
The CMAP dataset merges satellite and rain gauge data from a number of satellite sources and rain gauge sources. This version of the CMAP dataset does not use data from Numerical Weather Prediction (NWP) models. As a result, some gaps occur over high latitude regions. For users wanting complete coverage (i.e. no missing data, there is a version of CMAP with NWP estimates to fill in data voids at high latitides. Details on the component datasets as well as the method used to merge these data are provided by Xie and Arkin [1996, 1997].
This dataset is available through the