ieee Geoscience and remote sensing magazine Discharge (m3/s) 0 Jan-04 200 400 600 0 Jan-04 500 1000 1500 2000 May-04 May-04 Jan-05 (b) Sep-04 Jan-05 Water Year Sep-04 Canadian River at Calvin, OK (a) USA_State_ Boundary Rivers MRB_Boundary NWB_Boundary Stations Legend May-05 May-05 Sep-05 Observed Merged-SM Merged-ROF Sep-05 Observed 3B42RT CMORPH PERSIANN Kilometers 0 220440 880 1,320 1,760 N May-04 Sep-05 Observed Merged-SM Merged-ROF Sep-05 PERSIANN: 01/03/2005: mm/day May-05 May-05 Observed 3B42RT CMORPH PERSIANN M_ROF: 01/03/2005: mm/day M_SM: 01/03/2005: mm/day 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 (d) Ground: 01/03/2005: mm/day 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 0 5 10 15 20 25 30 35 40 45 50 CMORPH: 01/03/2005: mm/day (c) Sep-04 Jan-05 Water Year Sep-04 Jan-05 Water Year Missouri River at Hermann, MO May-04 3B42-RT: 01/03/2005: mm/day 0 Jan-04 2000 4000 6000 8000 10000 0 Jan-04 10000 20000 30000 Figure 1. (a) Mississippi River Basin (MRB) and Northwest Basin (NWB) in USA including gauging stations where stream flow simulations were performed. (b) and (c) Simulated stream flow using three major satellite rainfall products (the top graphs on both panels) and the simulated stream flow using two merged products; runoff based and soil moisture based merged products (the bottom graphs on both panels). (d) Comparison of spatial rainfall pattern of original satellite rainfall products (top three) and the two merged products with ground truth data (bottom). After Gebregiorgis and Hossain (2011). Discharge (m3/s) Discharge (m3/s) Discharge (m3/s) june 2014 27