Rainfall Estimation by Remote Sensing

Satellite estimation of rainfall is not likely to be better than rainfall measured through conventional rain gauges, but nevertheless is useful to fill in spatial and temporal gaps in ground reports. Nageswara Rao and Rao (1984) demonstrated an approach for preparing an indicative drought map based on NOAA AVHRR derived rainfall estimation at the seedling stage of crop growth. For drought monitoring, quantitative point-specific rainfall estimates on the daily basis all over the country may not be required. What is needed, however, is a capability to spatially distribute the point rainfall observations over the areal unit in a qualitative manner.

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