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Nielsen Designated Market Area (DMA) is a geographic region where the population can receive the same broadcasts (TV/Radio, Cable/Internet).
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GeoHex is a world coordinate system expressed by hexagon of various sizes. It's often used in games due to its simple matching nature. It's also useful for proximity/coverage since a hexagon approximates a circular area.
This gist is an exercise in figuring out DMA from a geohex code using opensource tools and data.