Calculation of the Grass Fuel Moisture Code. This calculates the moisture content of both the surface of a fully cured matted grass layer and also an equivalent Grass Fuel Moisture Code. All equations come from Wotton (2009) as cited below unless otherwise specified.
gfmcRaster(input, GFMCold = 85, time.step = 1, roFL = 0.3, out = "GFMCandMC")Returns a raster stack of either MC, GMFC, GFMC and MC or All
[raster stack]
| temp | (required) | Temperature (centigrade) |
| rh | (required) | Relative humidity (%) |
| ws | (required) | 10-m height wind speed (km/h) |
| prec | (required) | 1-hour rainfall (mm) |
| isol | (required) | Solar radiation (kW/m^2) |
GFMC from yesterday (double, default=85)
The hourly time steps (integer hour, default=1)
Nominal fuel load of the fine fuel layer (kg/m^2 double, default=0.3)
Output format (GFMCandMC/MC/GFMC/ALL, default=GFMCandMC)
Wotton, B.M. 2009. A grass moisture model for the Canadian Forest Fire Danger Rating System. In: Proceedings 8th Fire and Forest Meteorology Symposium, Kalispell, MT Oct 13-15, 2009. Paper 3-2. https://ams.confex.com/ams/pdfpapers/155930.pdf