altGrad {bise}R Documentation

Altitudinal gradient of budburst

Description

Computes the altitudinal gradient of budburst. Due to on average decreasing temperatures with increasing altitude budburst occurs later in mountainous regions than in lowlands. This function computes the delayed budburst in days per 1 [m] increase in altitude.

Usage

altGrad(x, y, alt, obsday)

Arguments

x Double(real), Longitude of observations in decimal degrees
y Doube(real), Latitude of observations in decimal degrees
alt Integer, Altitude of observations in [m]
obsday Julian day of observed budburst, e.g. 1st of May = 120

Details

gradient on altitude is

g_{ha} = g^{ha}

for example.

Value

Delayed budburst in days per 1 [m] increase in altitude

Author(s)

Daniel Doktor

References

Doktor D, Badeck FW, Hattermann F, Schaber J, McAllister M (2004) 'Analysis and modelling of spatially and temporally varying phenological phases'. Geostatistics for Environmental Applications. Proceedings of the Fifth European Conference on Geostatistics for Environmental Applications

Examples

## Not run: altGrad(x,y,alt,obsday)

[Package bise version 1.0 Index]