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The service is projected in "WGS 1984 Web Mercator (auxiliary sphere)" (EPSG 3857). The source datasets for the aerial photography range from 03cm - 60cm (1-inch - 2 foot) and are stored as 8-bit TIF images tiled into 1500×1500 meter cells based on the United States National Grid (USNG). The elevation products are derived from QL1 LiDAR point clouds and are similarly tiled using the USNG. 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