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dahi

Diurnal Anisotropic Heat Index

Description

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.

Usage

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

Author(s)

Jeffrey S. Evans <jeffrey_evans@tnc.org>

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

Examples

library(raster)
data(elev)
Ha <- dahi(elev)
  plot(Ha)
spatialEco

Spatial Analysis and Modelling Utilities

v1.3-6
GPL-3
Authors
Jeffrey S. Evans [aut, cre], Melanie A. Murphy [ctb], Karthik Ram [ctb]
Initial release
2021-03-24

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