In this paper, there is an undergoing effort to simulate and evaluate the sampling properties of the Global Precipitation Measurement Mission (GPM). The sampling quality is described in terms of the percentage of rainfall measured by ground instruments recoverable from the GPM measurements. A specific configuration of the constellation is being used. The number of participating satellites and their individual orbital characteristics are selected and calculated. The instruments necessary for measuring precipitation on board of the satellites are selected and configured as well. Two study areas are selected, Rondonia basin in Brazil and Ilarion basin in Greece. Data from rain gages and radar are used. The time step of the data is disaggregated from 1 hour to 1 minute so that they will be comparable to the duration of the satellites ’ contact time. The rainfall depth of every snapshot is set equal to the corresponding disaggregated values. The snapshots are then combined and rainfall events are reconstructed
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