= Surface differential reflectivity
{wiki=Surface_differential_reflectivity}
Surface differential reflectivity (often abbreviated as ZDR) is a radar measurement used primarily in meteorology to characterize precipitation and its properties. It is derived from the difference in the reflectivity of horizontally and vertically polarized radar waves. This measurement helps distinguish between different types of hydrometeors, such as rain, snow, hail, and even the presence of non-meteorological targets (like birds or insects).
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