CHOMPS utilizes all available passive microwave satellite estimates to develop improved global daily rainfall time series. No IR values are used. Satellite sources include SSM/I, AMSU, AMSR-E and TRMM. The most recent/accurate and consistent retrieval schemes have been used in the creation of the individual precipitation estimates. The original data are binned and optimal interpolation is used to merge the data and reduce errors. There are two data sets versions. One includes all passive satellite sources (CHOMPS) and one that does not include data from the AMSU sensor (CHOMPS-NoA). This was done to account for possible discontinuities when the AMSU instrument was added.
National Center for Atmospheric Research Staff (Eds). Last modified 01 Oct 2013. "The Climate Data Guide: CHOMPS: CICS High-Resolution Optimally Interpolated Microwave Precipitation from Satellites." Retrieved from https://climatedataguide.ucar.edu/climate-data/chomps-cics-high-resolution-optimally-interpolated-microwave-precipitation-satellites.