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<p>Watermark: Fire Safety Academy logo icon, 70 px, 45 % opacity</p> <p><b>New page</b></p><div>== Summary ==<br /> Level set model of wildland fire spread: each point of the front spreads as an ellipse elongated by wind and slope. Based on McGrattan et al. (2026), pp. 135–137.<br /> <br /> Original vector illustration for [[Wildland-urban interface]], level 2 Intermediate.<br /> <br /> * Source basis: McGrattan et al. (2026), p. 135 (level set model, fire front as zero level of the level set function), pp. 135–136 (elliptical spread from each point, length-to-breadth ratio from wind and slope), p. 137 (head-fire spread rate from Rothermel)<br /> * Alt text: Plan view of a fire front made of small ellipses stretched in the wind direction, with the front at three successive times.<br /> <br /> == Licensing ==<br /> New drawing by Fire Safety Academy. © Fire Safety Academy.</div>

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