Simple approximation of the anisotropic diurnal heat (Ha) distribution
The Diurnal Anisotropic Heat Index is based on this equation. Ha = cos(amax - a) * arctan(b) Where; amax defines the aspect with the maximum total heat surplus, a is the aspect and b is the slope angle.
dahi(x, amax = 202.5)
Arguments
| x | An elevation raster of class RasterLayer, SpatRaster or SpatialPixelsDataFrame |
|---|---|
| amax | The Alpha Max (amax) parameter in degrees defined as: minimum = 0, maximum = 360 with the default = 202.500 |
Value
RasterLayer class object Diurnal Anisotropic Heat Index
References
Boehner, J., and Antonic, O. (2009) Land-surface parameters specific to topo-climatology. In: Hengl, T., & Reuter, H. (Eds.), Geomorphometry - Concepts, Software, Applications. Developments in Soil Science, 33:195-226
Author
Jeffrey S. Evans <jeffrey_evans@tnc.org>
