| st.dist {GWmodel} | R Documentation |
Spatio-temporal distance matrix calculation
Description
Calculate a distance vector(matrix) between any GW model calibration point(s) and the data points.
Usage
st.dist(dp.locat, rp.locat, obs.tv, reg.tv,focus=0, p=2,
theta=0, longlat=F,lamda=0.05,t.units = "auto",
ksi=0, s.dMat,t.dMat)
Arguments
dp.locat |
a numeric matrix of two columns giving the coordinates of the data points |
rp.locat |
a numeric matrix of two columns giving the coordinates of the GW model calibration points |
obs.tv |
a vector of time tags for each observation, which could be numeric or of POSIXlt class |
reg.tv |
a vector of time tags for each regression location, which could be numeric or of POSIXlt class |
focus |
an integer, indexing to the current GW model point, if focus=0, all the distances between all the GW model calibration points and data points will be calculated and a distance matrix will be returned; if 0<focus<length(rp.locat), then the distances between the 'focus'th GW model points and data points will be calculated and a distance vector will be returned |
p |
the power of the Minkowski distance, default is 2, i.e. the Euclidean distance |
theta |
an angle in radians to rotate the coordinate system, default is 0 |
longlat |
if TRUE, great circle distances will be calculated |
lamda |
an parameter between 0 and 1 for calculating spatio-temporal distance |
t.units |
character string to define time unit |
ksi |
an parameter between 0 and PI for calculating spatio-temporal distance, see details in Wu et al. (2014) |
s.dMat |
a predifined spatial distance matrix for calculating spatio-temporal distances |
t.dMat |
a predifined temporal distance matrix for calculating spatio-temporal distances |
Value
Returns a numeric spatio-temporal distance matrix or vector; or a matrix with its rows corresponding to the observations and its columns corresponds to the calibration points.
Author(s)
Binbin Lu binbinlu@whu.edu.cn