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Terrain: USGS 3DEP. Forest canopy generated from Esri imagery (symbolic; Union-Rome has no LiDAR survey). Modeled Wi-Fi: EDX SignalPro Anderson 2D, 14 access points each run individually on a 5 m grid over USGS terrain and land-use clutter; the map takes the best site at each point. Modeled cellular: Okumura-Hata from the serving towers. Captured layers (Wi-Fi/cellular/gas/particulate/climate) are the drone's readings confined to each site's actual survey footprint — not spread across the valley. NH₃, Oxidizing and Reducing use equal-area hypsometric classes. The signal sea is the selected result drawn as a moving surface whose height and color follow the level. Imagery © Esri.