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The most extensive and longest running lightning data acquisition network is in the continental U.S. The NLDN has 15 years of historical data, and is continually
collecting new data. There are about 330 sensors in the U.S. and they provide a lateral resolution of between 100-500 feet for each strike. Lightning travels at
the speed of light, and unlike seismic data, there is not an improvement in location accuracy by increasing the number of sensors. Internationally Vaisala uses satellites
and strategically placed sensors to record lightning strike data as the GLD360. There are 3 years worth of data internationally. In addition, many different countries
around the world have lightning locating sensor networks. For instance, the Canadian Lighting Detection Network (CLDN) is owned by the Crown and public.

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