display the radial and angular component of the spectrum's centre as arrows.
Usage
uvplot(uv, z = NULL, x = NULL, y = NULL, col = "green",
zcol = grDevices::gray.colors(32, 0, 1), n = 42, f = 1,
length = 0.05, ...)
Arguments
uv
an array of dimension nx x ny x 2 , containing the u- and v-component, result of cen2uv
z
image to show in the background, defaults to sqrt(x^2+y^2)
x, y
optional x- and y-coordinates for the plot, must match the dimensions of z
col
color of the arrows
zcol
color scale for the image
n
number of arrows in one direction
f
factor by which to enlarge the arrows
length
length of the arrowhead in inches
...
further arguments passed to image
Details
The pivot of the arrows is at the location to which the u- and v-component belong. No arrowhead is displayed since the egdges detcted by the cdtwt have an orientation but no sign. The default size of the arrows is such that a 'velocity' of 1 corresponds to 5% of the shorter image side.