surf.ls {spatial} | R Documentation |
Fits a trend surface by least-squares.
surf.ls(np, x, y, z)
np |
degree of polynomial surface |
x |
x coordinates or a data frame with columns x , y , z
|
y |
y coordinates |
z |
z coordinates. Will supersede x$z
|
beta |
the coefficients |
x |
|
y |
|
z |
and others for internal use only. |
data(topo) topo.kr <- surf.ls(2, topo) trsurf <- trmat(topo.kr, 0, 6.5, 0, 6.5, 50) contour(trsurf) points(topo)