Minimum Travel Time Fire Spread (MTT) Inputs
User inputs required to run Minimum Travel Time (MTT) are outlined in the table below. For more detailed information, click on the links within the table.
| Inputs | Units | Brief Description |
|---|---|---|
| Ignition | ||
| shapes and shapefiles | N/A | Shapes or shapefiles to simulate ingitions and barriers. |
| Wind | ||
| Wind Type | Unitless | Choose between gridded, static, uphill or downhill. See Wind Options for more detail. |
| 20-ft Wind Speed | Miles per hour | Wind velocity measured 20 feet (6 m) above the top of the tree or shrub canopy, or above the ground if canopy is absent. |
| Wind Direction | Degrees | Wind direction is the direction from which the wind is blowing, specified in degrees increasing clockwise from north (which is zero degrees). |
| Crown Fire Inputs | ||
| Crown Fire Method | Unitless | Select one of two methods of calculating crown fire potential. See Crown Fire Calculation Options for more detail. |
| Foliar Moisture Content | Percentage | Moisture content of the crown foliage. The mass of water within the fuel particle expressed as a percentage of the fuel particle's oven-dry mass. See Initial and Foliar Moisture for more detail. |
| Initial Fuel Moisture | ||
| 1-hr Fuel Moisture | Percentage | Moisture content of 1-hour fuel (dead woody fuel >0 to ¼ inch or 0 to 6.4 mm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Initial and Foliar Moisture for more detail. |
| 10-hr Fuel Moisture | Percentage | Moisture content of 10-hour fuel (dead woody fuel >¼ to 1 inch or 0.6 to 2.5 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Initial and Foliar Moisture for more detail. |
| 100-hr Fuel Moisture | Percentage | Moisture content of 100-hour fuel (dead woody fuel >1 to 3 inches or 2.5 to 7.6 cm in diameter) is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Initial and Foliar Moisture for more detail. |
| Live Herbaceous Fuel Moisture | Percentage | Moisture content of live herbaceous fuel is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Initial and Foliar Moisture for more detail. |
| Live Woody Fuel Moisture | Percentage | Moisture content of live woody fuel is the mass of water within the fuel particle expressed as a percentage of the fuel particle’s oven-dry mass. See Initial and Foliar Moisture for more detail. |
| Fuel Moisture Conditioning | ||
| Conditioning Type | Unitless | Choose between initial, classified, or uploaded. See Fuel Moisture Conditioning for more detail. |
| Simulation Time | ||
| Burn Period Length | Hours | The duration of fire growth for each fire simulated. See Simulation Time for more detail. |
| Spotting | ||
| Spotting Probability | Percentage | The percentage of cells that launch embers when crown fire (passive or active) is initiated. See Spotting Details for more detail. |