Stephen Rayleigh’s unmanned aircraft does aerial photography from an altitude of 300 feet with images so crisp a runner’s shadow is visible on the pavement.

Rayleigh, 24, a recent graduate of Embry-Riddle Aeronautical University in Prescott, is developing a remote-control aerial technology that among other uses could provide detailed imagery of agricultural fields, tracking which crops are healthy and pinpointing acreage that might need more water or fertilizer.

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