Dataset name: 
GPCP Version 2.2 Combined Precipitation Data Set

Variable names: 
precipitation

Reference of original data:
Adler, R.F., G. Gu, G.J. Huffman, Estimating Climatological Bias Errors for the Global
  Precipitation Climatology Project (GPCP). J. Appl. Meteor. and Climatol., 51(1),
  doi:10.1175/JAMC-D-11-052.1, 84-99, 2012.

Downloaded site:
ftp://precip.gsfc.nasa.gov/pub/gpcp-v2.2/psg/

Downloaded Date:
Aug. 31, 2011, and updated on Oct. 7, 2013

Downloaded by:
Mingquan Mu 
Earth System Science, University of California, Irvine

Name and version of original source: 
GPCP v2.2

Start date:
January 1979

End date:
December 2012

Temporal resolution: 
monthly

Spatial resolution: 
2.5x2.5 degree

Unit: 
mm/day

Data format: 
binary unformatted