What a FireSim runs on. All optional: without them it burns uniform grass on flat ground.
Optional
Frame the sim's coordinates are in. Default world.frame.
world.frame
Custom terrain and fuel (overrides world).
world
Weather for wind, fuel moisture and lightning.
World for terrain, water, biomes (fuel) and roads.
What a FireSim runs on. All optional: without them it burns uniform grass on flat ground.