uvplot function

plot centre as vectors

display the radial and angular component of the spectrum's centre as arrows.

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.

Examples

uv <- cen2uv( dt2cen( fld2dt( blossom ) ) )
uvplot( uv, z=blossom )

See Also

cen2uv