 The new generation of weather observatory satellites, known as the Global Precipitation Measurement, GPM, Constellation Satellites, is the leading observatory of 10 highly advanced Earth-orbiting weather research satellites. These satellites are capable of measuring both light rain and snowfall, in addition to heavy tropical rainfall. This work compares the final run of the integrated multi-satellite retrievals for GPM, EMERG, product, the post-real time of tropical rainfall measuring mission, TRMM, and multi-satellite precipitation analysis, TMPA-3B42, and the European Center for Medium-Range Weather Forecasts, ECMWF, Aira Interim Product Against the Iran Meteorological Organizations, IMO, daily precipitation measured by the synoptic rain gauges over four regions with different topographies and climatic conditions in Iran. Assessment was conducted for a one-year period from March 2014 to February 2015. Overall, in daily scale, the results revealed that all three products underestimated precipitation, however. This article was authored by Esan Sharifi, Reinhold Steenacker, and Baram Sagafian. We are article.tv, links in the description below.