Rate of Spread (ROS) 3


Rate of Spread (ROS) 3 : The relative activity of a fire in extending its horizontal dimensions over time. Expressed as a rate of increase of the total perimeter of the fire, as a rate of forward spread of the fire front, or as a rate of increase in area, depending upon the intended use of the information. Usually it represents the forward spread and is expressed in chains per hour or meters per hour for a specific period in the fire's history
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