I have some orbit PMW rain rate products of different polar satellites. In order to know which one is the most accurate, I want to compare them with the hourly rain gauge data. But as you know, the hourly rain gauge data is an hourly accumulated precipitation, but PMW rain rate is an instantaneous value. Can I compare PMW rain rate with hourly rain gauge data? If I can't, how can I compare the orbit PMW rain rates of different polar satellites?
I would start by looking at what others have done toward creating integrated MW precipitation products, as differences in performance/calibration from different sensors must be dealt with in this context. For instance, see what was done at Remote Sensing Systems (http://www.ssmi.com):
Hilburn, KA, FJ Wentz, 2008, Intercalibrated passive microwave rain products from the unified microwave ocean retrieval algorithm (UMORA), Journal of Applied Meteorology and Climatology, 47, 778-794.
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