hli: Heat Load Index

Description Usage Arguments Value Note Author(s) References Examples

View source: R/hli.R

Description

Calculates the McCune & Keon (2002) Heat Load Index

Usage

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hli(x)

Arguments

x

raster object

Value

raster class object of McCune & Keon (2002) Heat Load Index

Note

Describes A southwest facing slope should have warmer temperatures than a southeast facing slope, even though the amount of solar radiation they receive is equivalent. The McCune and Keon (2002) method accounts for this by "folding" the aspect so that the highest values are southwest and the lowest values are northeast. Additionally, this method account for steepness of slope, which is not addressed in most other aspect rescaling equations. HLI values range from 0 (coolest) to 1 (hottest).

Author(s)

Jeffrey S. Evans <[email protected]>

References

McCune, B., and D. Keon (2002) Equations for potential annual direct incident radiation and heat load index. Journal of Vegetation Science. 13:603-606.

Examples

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  library(raster)
  data(elev)
  heat.load <- hli(elev)
    plot(heat.load, main="Heat Load Index") 
    

jeffreyevans/spatialEco documentation built on Aug. 11, 2018, 1:08 p.m.