biovars {dismo} | R Documentation |
bioclimatic variables
Description
Function to create 'bioclimatic variables' from monthly climate data.
Usage
biovars(prec, tmin, tmax, ...)
Arguments
prec |
vector, matrix, or RasterStack/Brick of precipitation data |
tmin |
vector, matrix, or RasterStack/Brick of minimum temperature data |
tmax |
vector, matrix, or RasterStack/Brick of maximum temperature data |
... |
Additional arguments |
Details
Input data is normaly monthly. I.e. there should be 12 values (layers) for each variable, but the function should also work for e.g. weekly data (with some changes in the meaning of the output variables. E.g. #8 would then not be for a quater (3 months), but for a 3 week period).
Value
Depending on the class of the input data, an object of class 'vector', 'matrix' or 'RasterBrick' with 19 variables (columns, layers)
bio1 = Mean annual temperature
bio2 = Mean diurnal range (mean of max temp - min temp)
bio3 = Isothermality (bio2/bio7) (* 100)
bio4 = Temperature seasonality (standard deviation *100)
bio5 = Max temperature of warmest month
bio6 = Min temperature of coldest month
bio7 = Temperature annual range (bio5-bio6)
bio8 = Mean temperature of the wettest quarter
bio9 = Mean temperature of driest quarter
bio10 = Mean temperature of warmest quarter
bio11 = Mean temperature of coldest quarter
bio12 = Total (annual) precipitation
bio13 = Precipitation of wettest month
bio14 = Precipitation of driest month
bio15 = Precipitation seasonality (coefficient of variation)
bio16 = Precipitation of wettest quarter
bio17 = Precipitation of driest quarter
bio18 = Precipitation of warmest quarter
Author(s)
Robert J. Hijmans
Examples
tmin <- c(10,12,14,16,18,20,22,21,19,17,15,12)
tmax <- tmin + 5
prec <- c(0,2,10,30,80,160,80,20,40,60,20,0)
biovars(prec, tmin, tmax)
tmn = tmx = prc = brick(nrow=1, ncol=1)
tmn <- setValues(tmn, t(matrix(c(10,12,14,16,18,20,22,21,19,17,15,12))))
tmx <- tmn + 5
prc <- setValues(prc, t(matrix(c(0,2,10,30,80,160,80,20,40,60,20,0))))
b <- biovars(prc, tmn, tmx)
as.matrix(b)