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using an array of short line segments oriented in the direction of air flow. In early 20th Century weather maps, this technique was elaborated into wind barbs, complex symbols used to indicate wind speed as well as direction. Unit vectors and streamlets have been proposed as a general term for point-based flow symbols, but neither is in wide usage. These can be readily generated by computer algorithms, especially using raster GIS data or sample point data (e.g., weather

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