This data set is a climatology of the satellite-gauge combination product in the GPCP Version 2.2 Combination (which the reader should see for a description, including references). All available months in the period January 1979--December 2011 are used to compute monthly climatological values.
The data set archive consists of unformatted REAL*4 binary files. Each file occupies about 40 KB, and the whole data set contains about 486 KB. The grid on which each field of values is presented is a 2.5°x2.5° latitude--longitude (Cylindrical Equal Distance) global array of points. It is size 144x72, with X (longitude) incrementing most rapidly West to East from the Prime Meridian, and then Y (latitude) incrementing North to South. Grid edges are located at whole- and half-degree values:
First point center = (88.75°N,1.25°E)
Second point center = (88.75°N,3.75°E)
Last point center = (88.75°S,1.25°W)
Units are mm/day.
The dataset curator is:
David T. Bolvin
NASA Goddard Space Flight Center
Greenbelt, MD 20771 USA
Phone: +1 301-614-6323
Fax: +1 301-614-5492