The ROBIN system received a radar signal from two long-range surveillance radars in Belgium and the Netherlands. Every half hour radar measurements were sampled from ten successive high-resolution images and processed to extract location, ground speed, and track direction of individual birds or flocks. The project used data from the first two hours after sunset on April 6 and 7, 2013. During this period birds take-off from the radar locations to continue their nocturnal spring migration.
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