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Two important logistical requirements influence the success of a disaster assessment conducted in the wake of a tornado: Highly detailed maps. Such maps are extremely important tools for those organizing geographic-based field surveys in highly urbanized areas. These are best obtained from state and local authorities. Aerial reconnaissance. The earliest and most reliable information concerning the path of the tornado storm is usually obtained from aerial reconnaissance. If the ground-based assessment is not guided by such aerial visual surveys, it will be delayed and its effectiveness reduced.