HoldridgeHypsometricCol {Ternary} | R Documentation |
Used to colour HoldridgeHexagons()
, and may also be used to aid the
interpretation of PET + precipitation data in any graphical context.
HoldridgeHypsometricCol(pet, prec, opacity = NA)
pet, prec |
Numeric vectors giving potential evapotranspiration ratio and annual precipitation (in mm). |
opacity |
Opacity level to be converted to the final two characters
of an RGBA hexadecimal colour definition, e.g. |
Character vector listing RGB or (if opacity != NA
)
RGBA values corresponding to each PET-precipitation value pair.
Martin R. Smith (martin.smith@durham.ac.uk)
Palette derived from the hypsometric colour scheme presented at Shaded Relief.
Other Holdridge plotting functions:
AddToHoldridge()
,
HoldridgePlot()
,
holdridgeClasses
,
holdridge
HoldridgePlot(hex.col = HoldridgeHypsometricCol) VeryTransparent <- function(...) HoldridgeHypsometricCol(..., opacity = 0.3) HoldridgePlot(hex.col = VeryTransparent) pet <- holdridge$PET prec <- holdridge$Precipitation ptCol <- HoldridgeHypsometricCol(pet, prec) HoldridgePoints(pet, prec, pch = 21, bg = ptCol)