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NE Florida’s St. Johns County is one of the state's most rapidly-growing regions. In an effort to keep up with appraisals of new construction in the county and ensure compliance, the Property Appraiser has turned to drones to help in its assessment of value. The aircraft are deployed for multiple reasons, including compliance with building permits and tracking lots that may soon be added to the tax rolls. In 2018, St. Johns County added 4,300 new residential properties to its tax base. UAVOS and Stratodynamics Aviation have completed flights tests of the HiDron earth observation platform called an altitude of 82,000 ft. HiDron also carried an atmospheric measuremen