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To derive the sub-footprint scale sigma0 from TRMM/PR observation datasets, a new formulation to calculate the sub-footprint sigma0 is devised. The sub-footprint scale sigma0 would be useful to, (1) relieve the underestimate of the path integrated attenuation (PIA) at off-nadir angle observations over land, and (2) examine the nonuniformity of rainfall. The PIA estimated from sigma0 of the standard...
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