altGrad {bise} | R Documentation |
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.
altGrad(x, y, alt, obsday)
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 |
gradient on altitude is
g_{ha} = g^{ha}
for example.
Delayed budburst in days per 1 [m] increase in altitude
Daniel Doktor
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
## Not run: altGrad(x,y,alt,obsday)